Key to Strumigenys of East Asia

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This worker key is based on: Bolton, B. 2000. The ant tribe Dacetini. Memoirs of the American Entomological Institute. 65:1-1028.

Malasian-Oriental-East Palaearctic Strumigenys

Bolton noted: Note. The Tongan Strumigenys zakharovi (species inquirenda) is not included in the key.

This key is from a study that included the now synonymized genus Pyramica. Therefore there are two sets of keys for the Strumigenys species from this region: the key found below and a key for the species once classified as Pyramica: Key to Strumigenys of East Asia (as Pyramica).

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1

  • Antenna with 4 segments; first funicular segment not separated from the 2-segmented apical club . . . . . 2
  • Antenna with 6 segments; first funicular segment separated from the 2-segmented apical club by two small segments . . . . . 6

2

return to couplet #1

  • Pronotal humeral hair present, stiff and simple . . . . . 4

3

return to couplet #2

  • Leading edge of scape expanded into a massive projecting lobe, the area of which is much greater than the area of the median portion of the clypeus; SL at most 1.60 times the maximum scape width. Apical segment of antenna not spindle-shaped, broad basally where it articulates with preapical segment. (Indonesia (Sulawesi, Kai Besar), Papua New Guinea, Solomon Is) . . . . . Strumigenys eurycera
  • Leading edge of scape shallowly convex, not expanded into a massive projecting lobe that is greater in area than median portion of clypeus; SL 5.00 times the maximum scape width. Apical segment of antenna spindle-shaped, very constricted and narrow basally where it articulates with preapical segment. (Papua New Guinea) . . . . . Strumigenys pharosa

4

return to couplet #2

  • Basal half of first gastral sternite unsculptured. Cephalic dorsum with numerous orbicular hairs, without erect simple hairs. Leading edge of scape with short spatulate or spoon-shaped hairs that are shorter than maximum width of scape. (Pantropical tramp species) . . . . . Strumigenys emmae
Strumigenys emmae casent0005894 profile 1.jpg

5

return to couplet #5

  • Pronotum and mesonotum each with a single pair of short erect hairs. With head in full-face view dorsolateral margin with only 2-3 laterally projecting stiff hairs. Mesopleuron partly smooth. (Papua New Guinea) . . . . . Strumigenys quattuor
Strumigenys quattuor casent0102585 profile 1.jpg
  • Pronotum and mesonotum each with numerous short erect hairs. With head in full-face view dorsolateral margin with more than 5 laterally projecting stiff hairs. Mesopleuron entirely reticulate-punctate. (Papua New Guinea) . . . . . Strumigenys tetra
Strumigenys tetra casent0900748 p 1 high.jpg

6

return to couplet #1

  • With petiole in profile the ventral surface without any trace of a longitudinal spongiform or laminate crest, lamella or curtain . . . . . 7
  • With petiole in profile the ventral surface with a longitudinal spongiform or laminate crest, lamella or curtain present; may be narrow or sometimes reduced to a small lobe or narrow strip beneath the node . . . . . 16
  • Basal half of first gastral sternite longitudinally costulate. Cephalic dorsum with numerous short erect simple hairs, without orbicular hairs. Leading edge of scape with simple curved hairs that are longer than maximum width of scape . . . . . 5

7

return to couplet #6

  • Postpetiole in profile with ventral spongiform lobe large and well developed; lobe broadly triangular to broadly rounded and at least equal in size to the exposed cuticle of the disc . . . . . 8
  • Postpetiole in profile with ventral lobe vestigial to absent; when vestigially present the lobe not broadly triangular nor broadly rounded and very much smaller than the exposed cuticle of the disc . . . . . 9

8

return to couplet #7

  • Head, alitrunk and disc of postpetiole smooth and shining. In full-face view ventrolateral margin of head deeply excavated immediately in front of the eye. Declivity of propodeum with a broad lamella, its posterior (free) margin convex. Basigastral costulae short, restricted to zone immediately behind limbus. Head broad, scape shorter; CI 95, SI 55. (Indonesia (Sulawesi)) . . . . . Strumigenys zapyx
Strumigenys zapyx casent0900857 p 1 high.jpg
  • Head, alitrunk and disc of postpetiole reticulate-punctate. In full-face view ventrolateral margin of head not excavated immediately in front of the eye. Declivity of propodeum with a narrow carina, its posterior (free) margin concave. Basigastral costulae long, extending over the basal half of the tergite. Head narrow, scape longer; CI 70, SI 82. (Papua New Guinea) . . . . . Strumigenys wilsoni
Strumigenys wilsoni casent0280754 p 1 high.jpg

9

return to couplet #7

  • With alitrunk in dorsal view pronotum and anterior mesonotum black or blackish brown, propodeal dorsum and usually also posterior portion of mesonotum yellow, the two colour zones strongly contrasting . . . . . 10
  • With alitrunk in dorsal view entire surface more or less uniformly coloured yellow, brown or black, without strongly contrasting zones of black and yellow . . . . . 12

10

return to couplet #9

  • Ventrolateral margin of head deeply notched or impressed immediately in front of eye, the notch or impression continued onto the ventral surface of the head as a transverse preocular groove or impression that extends toward, but does not reach, the midline . . . . . 11
  • Ventrolateral margin of head not deeply notched or impressed immediately in front of eye; the ventral surface of the head without a transverse preocular groove or impression that extends toward the midline. (Papua New Guinea) . . . . . Strumigenys yasumatsui

11

return to couplet #10

  • Petiole and postpetiole black. Petiole in profile with anterior face of node meeting dorsum in a long shallow convexity, the dorsum much longer than the anterior face. (Papua New Guinea) . . . . . Strumigenys tigris
Strumigenys tigris casent0280735 p 1 high.jpg
  • Petiole and postpetiole yellow. Petiole in profile with anterior face of node meeting dorsum in a blunt angle, the dorsum only slightly longer than the anterior face. (Indonesia (Irian Jaya), Papua New Guinea) . . . . . Strumigenys hemichlaena
Strumigenys hemichlaena casent0900760 h 1 high.jpg

12

return to couplet #9

  • Propodeal teeth absent in profile, the angle between dorsum and declivity unarmed or with a pair of minute blunt tubercles; in dorsal view the tubercles much shorter than the distance separating them. (Papua New Guinea) . . . . . Strumigenys disarmata
Strumigenys disarmata casent0280736 p 1 high.jpg
  • Propodeal teeth or spines conspicuous in profile, narrowly triangular and acute; in dorsal view the teeth equal to or greater in length than the distance separating them . . . . . 13

13

return to couplet #12

  • Head, alitrunk and waist segments yellow to light yellow-brown everywhere; gaster may be same shade or darker . . . . . 14
  • Head, alitrunk and waist segments black to blackish brown everywhere; gaster also black or blackish brown. (Papua New Guinea) . . . . . Strumigenys nigra
Strumigenys nigra casent0280734 p 1 high.jpg

14

return to couplet #13

  • Side of alitrunk completely smooth and shining, without trace of reticulate-punctate sculpture. (Papua New Guinea) . . . . . Strumigenys lancea
Strumigenys lancea casent0900759 p 1 high.jpg
  • Side of alitrunk almost entirely reticulate-punctate, at most with a smooth patch on katepisternum . . . . . 15

15

return to couplet #14

  • Hairs of apical row on first gastral tergite and hairs on second gastral tergite flagellate, contrasting with the straight stiff hairs on the postpetiole. Propodeal spines long and slender, twice as long as the distance between their bases. Larger species, HL > 1.00. (Indonesia (Kai Besar), Papua New Guinea, Palau) . . . . . Strumigenys stemonixys
Strumigenys stemonixys casent0178461 profile 1.jpg
  • Hairs of apical row on first gastral tergite and hairs on second gastral tergite simple, short and stiff, the same as those on the postpetiole. Propodeal spines shorter, about equal to distance between their bases or less. Smaller species, HL < 1.00. (Singapore, Philippines (Mindanao, Luzon, Mindoro, Negros), Indonesia (Sulawesi, Kai Besar, Aru, Irian Jaya), Papua New Guinea, Solomon Is, Vanuatu, Samoa, Ponape I.; also in Australia) . . . . . Strumigenys szalayi
Strumigenys szalayi casent0178462 profile 1.jpg

16

return to couplet #6

  • Ventrolateral margin of head at level of eye extended outward and downward, forming an acutely triangular prominence. Eye located on dorsal surface of this prominence; acute apex of prominence extends out beyond the midlength of the eye in the form of a sharp point . . . . . 17
  • Ventrolateral margin of head at level of eye regular or with a preocular notch or impression, but not extended outward and downward as an acutely triangular prominence. Eye not located on dorsal surface of a triangular prominence and without a sharp point that extends out beyond the midlength of the eye . . . . . 19

17

return to couplet #16

  • Erect hairs on cephalic dorsum stiff and shallowly curved, apically truncated and slightly splayed or minutely bifid. (Malaysia (Sarawak)) . . . . . Strumigenys akalles
Strumigenys akalles casent0900778 p 1 high.jpg
  • Erect hairs on cephalic dorsum fine, soft and flexuous, apically tapering to acute points . . . . . 18

18

return to couplet #17

  • With mandibles fully closed the proximal preapical tooth of the left mandible is longer than the distance between its base and the anterior clypeal margin. Clypeus and pronotal dorsum smooth and shining. (Malaysia (West Malaysia), Indonesia (Java)) . . . . . Strumigenys eidechthes
Strumigenys eidechthes casent0102661 profile 1.jpg
  • With mandibles fully closed the proximal preapical tooth of the left mandible is much shorter than the distance between its base and the anterior clypeal margin. Clypeus and pronotal dorsum finely sculptured. (Malaysia (West Malaysia, Sarawak, Sabah), Indonesia (Sumatra, Sulawesi), Philippines (Luzo)) . . . . . Strumigenys inhonesta
Strumigenys inhonesta casent0900780 p 1 high.jpg

19

return to couplet #16

  • Apex of mandible with three short-spiniform to long-spiniform teeth arranged in a vertical or oblique series (series may be extremely oblique so that lowermost tooth has migrated onto ventral surface and appears as a ventrally-arising preapical tooth in full-face view); with 0-2 intercalary denticles or small teeth, which when present arise between apicomedian and apicoventral teeth or from dorsal surface of apicoventral tooth . . . . . 20
  • Apex of mandible with two spiniform teeth arranged in a vertical or near-vertical series; with 0-3 intercalary denticles or small teeth, which when present arise between the apicodorsal and apicoventral teeth or from dorsal surface of apicoventral tooth near its base . . . . . 35

20

return to couplet #19

  • Fully closed mandible in full-face view very broad proximally and strikingly tapered distally, obviously not linear or curvilinear. Outer margin of mandible flared outwards near base and with a strongly projecting prebasal angle. In ventral view outer margin of mandible distal of level of anterior clypeal margin abruptly changing direction . . . . . 21
  • Fully closed mandible in full-face view not very broad proximally nor strikingly tapered distally, linear or curvilinear, sometimes weakly sinuate. Outer margin of mandible not flared outwards near base, without a strongly projecting prebasal angle. In ventral view outer margin of mandible forms a more or less continuous line that does not abruptly change direction distal of level of anterior clypeal margin . . . . . 30

21

return to couplet #20

  • With alitrunk in dorsal view pronotal humeral hair absent . . . . . 22
  • With alitrunk in dorsal view pronotal humeral hair present, projecting laterally; hair straight, simple or clavate, may be elongate or short and stout . . . . . 24

22

return to couplet #21

  • With head in full-face view apicoscrobal hair present, very short and stubbly. Appressed hairs on first gastral tergite fine, very narrowly spatulate and inconspicuous . . . . . 23
  • With head in full-face view apicoscrobal hair absent. Appressed hairs on first gastral tergite distinctly spatulate, numerous and conspicuous. (Malaysia (Sarawak), Indonesia (Kalimantan)) . . . . . Strumigenys aechme
Strumigenys aechme casent0900769 p 1 high.jpg

23

return to couplet #22

  • Postpetiole disc in dorsal view much broader than petiole node. Small species, HW ca 0.47. (Sri Lanka, India, Bhutan) . . . . . Strumigenys lyroessa
Strumigenys lyroessa casent0280737 p 1 high.jpg
  • Postpetiole disc in dorsal view about equal to petiole node width. Larger species, HW 0.56-0.61. (Malaysia (West Malaysia)) . . . . . Strumigenys tantilla
Strumigenys tantilla casent0102583 profile 1.jpg

24

return to couplet #21

  • Dorsal surfaces of pronotum and mesonotum with numerous short straight erect stubbly hairs; similar hairs also present on dorsolateral margins of mesonotum. (Indonesia (Sulawesi)) . . . . . Strumigenys dryas
Strumigenys dryas casent0102646 profile 1.jpg
  • Dorsal surfaces of pronotum and mesonotum without erect hairs; dorsolateral margins of the mesonotum either hairless or at most with 2-3 short erect hairs on each margin . . . . . 25

25

return to couplet #24

  • Scape relatively long and head narrower, SI 67-71, CI 68-71; hind femur elongate, about equal to HW. (Malaysia (Sabah)) . . . . . Strumigenys liophila
Strumigenys liophila casent0102615 profile 1.jpg
  • Scape relatively short and head broader, SI 50-57, CI 72-84; hind femur short, much less than HW . . . . . 26

26

return to couplet #25

  • First gastral tergite entirely covered with fine dense longitudinal striolate-punctulate sculpture. Eye with 7-8 ommatidia in longest row; maximum diameter of eye obviously greater than maximum width of scape. Larger species, HL 0.89-0.92, HW 0.73-0.76. (India) . . . . . Strumigenys hostilis
Strumigenys hostilis casent0900770 p 1 high.jpg
  • First gastral tergite un sculptured except for basigastral costulae. Eye with 3-5 ommatidia in longest row; maximum diameter of eye at most equal to maximum width of scape, usually less. Smaller species, HL 0.62-0.80, HW 0.47-0.62 . . . . . 27

27

return to couplet #26

  • Lamella on propodeal declivity very narrow in profile; at its broadest point below the level of the spiracle it is less than half the length of the propodeal tooth . . . . . 28
  • Lamella on propodeal declivity broader in profile; at its broadest point below the level of the spiracle it is distinctly more than half the length of the propodeal tooth . . . . . 29

28

return to couplet #27

  • Petiole node in dorsal view about as broad as long, not transversely rectangular. Larger black species, HL 0.77-0.80, HW 0.60-0.62. (Malaysia (West Malaysia)) . . . . . Strumigenys micrura
Strumigenys micrura casent0102606 profile 1.jpg
  • Petiole node in dorsal view much broader than long, transversely rectangular. Smaller light brown species, HL 0.65, HW 0.49. (Indonesia (Sulawesi)) . . . . . Strumigenys imantodes
Strumigenys imantodes casent0900775 p 1 high.jpg

29

return to couplet #27

  • Mandible in profile with preapical tooth strongly developed, broader-based and stouter than the apicodorsal tooth; dorsal margin of mandible depressed distal of preapical tooth so that space between the two teeth appears as a cleft. (Thailand, Malaysia (West Malaysia), Indonesia (Java, Lombok)) . . . . . Strumigenys sydorata
Strumigenys sydorata casent0102619 profile 1.jpg
  • Mandible in profile with preapical tooth about the same shape and size as the apicodorsal tooth; dorsal margin of mandible not depressed distal of preapical tooth, space between the two teeth appears as a short transverse margin. (Malaysia (Sarawak, Sabah), Indonesia (Kalimantan, Thnimbar), Philippines (Palawan, Luzon)) . . . . . Strumigenys arrogantia
Strumigenys arrogantia casent0102632 profile 1.jpg

30

return to couplet #20

  • Hairs on first gastral tergite flagellate, elongate and fine, slender and acute apically. Intercalary denticles absent between apicomedian and apicoventral spiniform teeth although a minute denticle may arise from about the dorsal midlength of the apicoventral tooth . . . . . 31
  • Hairs on first gastral tergite stiff, either simple, remiform or spatulate, straight to shallowly curved and blunt apically. One or two intercalary denticles present between apicomedian and apicoventral spiniform teeth or arising from near base of apicoventral tooth on its dorsal surface . . . . . 33

31

return to couplet #30

  • Head extremely broad, almost or quite as broad as long, CI ca 100. With head in full-face view the apical series of mandibular teeth extremely oblique, so that the apicoventral tooth arises preapically from the ventral surface of the mandible. Hairs on postpetiole flagellate, the same as those on first gastral tergite . . . . . 32
  • Head elongate, obviously longer than broad, CI ca 75. With head in full-face view the apical series of mandibular teeth nearly vertical, the apicoventral tooth does not arise preapically from the ventral surface of the mandible. Hairs on postpetiole stiff and remiform, contrasting strongly with the long flagellate hairs on first gastral tergite. (Malaysia (Sarawak, Sabah)) . . . . . Strumigenys trixodens
Strumigenys trixodens casent0900749 p 1 high.jpg

32

return to couplet #31

  • Mandibles shorter and stouter, MI 45-51. Length of apicodorsal tooth of mandible (measured from apex to junction with inner margin of mandible) 2.00-2.25 times the maximum mandibular width. Scape slightly shorter, SI 43-50. (Thailand, Malaysia (West Malaysia, Sarawak, Sabah), Brunei, Indonesia (Sumatra)) . . . . . Strumigenys rotogenys
Strumigenys rotogenys casent0179672 p 1 high.jpg
  • Mandibles longer and narrower, MI 56-57. Length of apicodorsal tooth of mandible (measured from apex to junction with inner margin of mandible) 2.80-3.10 times the maximum mandibular width. Scape slightly longer, SI 51-54. (Malaysia (Sarawak)) . . . . . Strumigenys gyrogenys
Strumigenys gyrogenys casent0900752 p 1 high.jpg

33

return to couplet #30

  • Inner margin of mandible with a broad translucent cuticular lamella that extends from base of mandible to near base of apicodorsal tooth; at full closure inner margins very nearly touching throughout their length. (Thailand) . . . . . Strumigenys tritomea
Strumigenys tritomea casent0102574 profile 1.jpg
  • Inner margin of mandible without a cuticular lamella; at full closure inner margins widely separated throughout their length . . . . . 34

34

return to couplet #33

  • Pleurae and side of propodeum mostly or entirely smooth. Dorsal (outer) surface of hind basitarsus with a number of projecting long straight hairs that are filiform to weakly remiform and about three times longer than the maximum width of the basitarsus. (Malaysia (West Malaysia, Sarawak), Philippines (Luzon), Indonesia (Sulawesi)) . . . . . Strumigenys chapmani
Strumigenys chapmani casent0280732 p 1 high.jpg
  • Pleurae and side of propodeum entirely finely reticulate-punctate. Dorsal (outer) surface of hind basitarsus with relatively short curved spatulate hairs that are somewhat elevated and only slightly longer than the maximum width of the basitarsus. (Malaysia (Sarawak)) . . . . . Strumigenys treptodens
Strumigenys treptodens casent0900750 p 1 high.jpg

35

return to couplet #19

  • With alitrunk in profile the diameter of the excavated area of the mesopleural gland

enormous, at least equal to the maximum width of the first coxa . . . . . 36

  • With alitrunk in profile the diameter of the excavated area of the mesopleural gland small to moderate, much less than the maximum width of the first coxa . . . . . 42

36

return to couplet #35

  • With petiole in profile, and also in dorsal view, the lateral spongiform lobe of the node extends forward to about the level of the spiracle on the peduncle . . . . . 37
  • With petiole in profile, and also in dorsal view, the lateral spongiform lobe is confined to the node and does not extend forward to the spiracle on the peduncle . . . . . 40

37

return to couplet #36

  • Mandible with a small but distinct preapical tooth. (Philippines (Luzon)) . . . . . Strumigenys mirifica
Strumigenys mirifica casent0102576 profile 1.jpg
  • Mandible without trace of preapical teeth or denticles . . . . . 38

38

return to couplet #37

  • Head in profile with extremely long erect hairs arising from the highest point of the dorsum and also from the surface anterior to the highest point; these hairs as long as those that arise close to the occipital margin. With mandible in frontal view curve between bases of apicodorsal and apicoventral teeth wide and very broadly V-shaped. With alitrunk in profile glandular excavation in anterior margin of mesopleuron usually distinctly longer than remaining length of katepisternum. Head narrower, scape longer, CI 57-64, SI 103-128 . . . . . 39
  • Head in profile with hairs that arise in front of highest point of dorsum much shorter than those arising more posteriorly. With mandible in frontal view angle between bases of apicodorsal and apicoventral teeth V-shaped to narrowly V-shaped. With alitrunk in profile glandular excavation in anterior margin of mesopleuron usually slightly shorter than remaining length of katepisternum. Head broader, scape shorter, CI 66-74, SI 86-97. (Thailand, Malaysia (West Malaysia, Sarawak, Sabah), Indonesia (Sumatra, Java, Bali, Lombok, Sumba, Ambon, Sulawesi, Timor)) . . . . . Strumigenys doriae
Strumigenys doriae casent0217948 p 1 high.jpg

39

return to couplet #38

  • In oblique dorsal view side of propodeum without dense standing pubescence that obscures the spiracle. Short grey pubescence on dorsal alitrunk relatively sparse on pronotum and propodeum, these areas without a furry appearance. (Malaysia (West Malaysia, Sarawak)) . . . . . Strumigenys magnifica
Strumigenys magnifica casent0102575 profile 1.jpg
  • In oblique dorsal view side of propodeum with dense standing pubescence that obscures the spiracle. Short grey pubescence on dorsal alitrunk very dense on pronotum and propodeum, these areas with a furry appearance. (Malaysia (Sabah), Brunei) . . . . . Strumigenys gloriosa
Strumigenys gloriosa casent0102654 profile 1.jpg

40

return to couplet #36

  • Mandible with 2 minute preapical denticles. Surface of first gastral tergite with dense appressed grey pubescence between the bases of the erect flagellate hairs. In dorsal view pronotal humeri angulate. (Malaysia (Sabah)) . . . . . Strumigenys hekate
Strumigenys hekate casent0102608 profile 1.jpg
  • Mandible without trace of preapical denticles. Surface of first gastral tergite without pubescence between the bases of the erect flagellate hairs. In dorsal view pronotal humeri rounded . . . . . 41

41

return to couplet #40

  • With mandible in frontal view angle between bases of apicodorsal and apicoventral teeth very broadly V-shaped; apicoventral tooth about same length as apicodorsal. Head narrower, mandibles shorter and scapes longer, CI 57-60, MI 46-48, SI 112-118. (Malaysia (Sarawak)) . . . . . Strumigenys superba
Strumigenys superba casent0900757 p 1 high.jpg
  • With mandible in frontal view angle between bases of apicodorsdal and apicoventral teeth narrow and V-shaped; apicoventral tooth much shorter than apicodorsal. Head broader, mandibles longer and scapes shorter, CI 65, MI 53, SI 99. (Malaysia (Sarawak, Sabah)) . . . . . Strumigenys bryanti
Strumigenys bryanti casent0280733 p 1 high.jpg

42

return to couplet #35

  • Preapical dentition of each mandible of two articles; either with 2 preapical teeth or with one tooth and a denticle . . . . . 43
  • Preapical dentition of each mandible either absent or of a single article; when present with either a single tooth or a single denticle . . . . . 47

43

return to couplet #42

  • Proximal preapical tooth much shorter than distal preapical tooth, the former in the basal half of the mandible length. Mesonotum and first gastral tergite without standing hairs . . . . . 44
  • Proximal preapical tooth longer than distal preapical tooth, both in the apical third of the mandible length. Mesonotum and first gastral tergite with standing hairs . . . . . 45

44

return to couplet #43

  • With petiole in profile the node with a short steeply ascending anterior face that separates the peduncle from the dorsum. Cephalic dorsum feebly superficially shagreenate on posterior half, without ground-pilosity and without a pair of erect hairs at highest point of vertex. (Solomon Is) . . . . . Strumigenys decollata
Strumigenys decollata casent0909306 p 1 high.jpg
  • With petiole in profile the node without a steeply ascending anterior face, the peduncle grading into the dorsum through a shallowly convex long even curve. Cephalic dorsum reticulate-rugulose on posterior half, with spatulate ground-pilosity and with a pair of erect hairs at highest point of vertex. (Papua New Guinea) . . . . . Strumigenys praecollata

45

return to couplet #43

  • Ventrolateral margin of the head deeply indented immediately in front of the eye, so deeply that the anterior portion of the eye is detached from the side of the head. Ventral surface of head with a transverse preocular impression that is posterior to and separate from the postbuccal groove. (Cosmopolitan tramp species) . . . . . Strumigenys rogeri
Strumigenys rogeri casent0005897 profile 1.jpg
  • Ventrolateral margin of the head continuous to the anterior margin of the eye, without trace of an indentation of the margin immediately in front of the eye. Ventral surface of head without a transverse preocular impression that is posterior to and separate from the postbuccal groove . . . . . 46

46

return to couplet #45

  • With postpetiole in profile its ventral spongiform lobe smaller than the exposed cuticle of the swollen disc. Larger species, HL 0.60-0.64, HW 0.46-0.48. (Indonesia (Timor)) . . . . . Strumigenys integra
Strumigenys integra casent0102665 profile 1.jpg
  • With postpetiole in profile its ventral spongiform lobe larger than the exposed cuticle of the disc. Smaller species, HL 0.49-0.55, HW 0.40-0.43. (Indonesia (Bali, Lombok) . . . . . Strumigenys yanintra
Strumigenys yanintra casent0102666 profile 1.jpg

47

return to couplet #42

  • With head in full-face view mandible without preapical dentition, no trace of a projecting preapical tooth or denticle . . . . . 48
  • With head in full-face view mandible with preapical dentition, a projecting preapical tooth or denticle present . . . . . 54

48

return to couplet #47

  • Dorsal (outer) surface of middle and hind basi tarsus with two or more very long projecting suberect to erect hairs that are finely filiform or flagellate and very much longer than the maximum width of the segment from which they arise. First gastral tergite with fine soft filiform to flagellate hairs . . . . . 49
  • Dorsal (outer) surface of middle and hind basitarsus without long projecting suberect to erect hairs; any pilosity present is short, simple to spatulate and decumbent to appressed. First gastral tergite with stiff simple blunt hairs . . . . . 52

49

return to couplet #48

  • First gastral tergite with dense appressed greyish pubescence covering the sclerite between the bases of the erect long hairs. (Malaysia (Sarawak), Brunei) . . . . . Strumigenys cygarix
Strumigenys cygarix casent0102640 profile 1.jpg
  • First gastral tergite with the surface bare between the bases of the erect long hairs, without any appressed pubescence . . . . . 50

50

return to couplet #49

  • Side of alitrunk evenly longitudinally sulcate everywhere. Coxa of front leg transversely sulcate. (Thailand) . . . . . Strumigenys caniophanes
Strumigenys caniophanes casent0102637 profile 1.jpg
  • Side of alitrunk without sulcate sculpture; side either finely granulate or punctate, or partly smooth. Coxa of front leg not sulcate . . . . . 51

51

return to couplet #50

  • Mesopleuron entirely reticulate-punctate. Petiole node in dorsal view slightly broader than long. Scape relatively longer, SI 84. (Malaysia (Sabah)) . . . . . Strumigenys dromica
Strumigenys dromica casent0102645 profile 1.jpg
  • Mesopleuron mostly smooth and shining. Petiole node in dorsal view longer than broad. Scape relatively shorter, SI 71. (China) . . . . . Strumigenys heteropha
Strumigenys heteropha casent0900791 p 1 high.jpg

52

return to couplet #48

  • Ventrolateral margin of head with a deep semicircular impression immediately in front of the eye. Apicoventral tooth of mandible vertically below apicodorsal tooth. Side of alitrunk mostly or entirely reticulate-punctate . . . . . 53
  • Ventrolateral margin of head continuous in front of the eye, without a semicircular impression. Apicoventral tooth of mandible shifted proximally, not vertically below apicodorsal tooth. Side of alitrunk mostly un sculptured and smooth. (Malaysia (Sabah), Indonesia (Sumatra)) . . . . . Strumigenys ochosa
Strumigenys ochosa casent0102620 profile 1.jpg

53

return to couplet #52

  • Disc of postpetiole reticulate-punctate. Petiole node longer than broad in dorsal view. Dorsolateral margin of head in full-face view with two laterally projecting stiff long hairs between level of eye and occipital corner; one at level of eye, the other apicoscrobal. With narrower head and longer scape and mandibles; CI < 75, SI > 90, MI > 45. (Indonesia (Aru)) . . . . . Strumigenys rayma
Strumigenys rayma casent0102668 profile 1.jpg
  • Disc of postpetiole u n sculptured and smooth. Petiole node broader than long in dorsal view. Dorsolateral margin of head in full-face view with four or more laterally projecting short stubbly hairs between level of eye and occipital corner. With broader head and shorter scape and mandibles; CI > 80, SI < 70, MI < 45. (Papua New Guinea) . . . . . Strumigenys pachycephala
Strumigenys pachycephala casent0900865 p 1 high.jpg

54

return to couplet #47

  • Dorsal (outer) surface of hind basitarsus with one or more freely projecting filiform or flagellate hairs that are very long and suberect to erect; this specialised pilosity may also be present on the middle basi tarsus and the middle and hind tibiae . . . . . 55
  • Dorsal (outer) surface of hind basitarsus without freely projecting long filiform or flagellate hairs; any pilosity present is simple to spatulate and usually decumbent to appressed; projecting long fine simple hairs absent from middle basi tarsus and from middle and hind tibiae . . . . . 130

55

return to couplet #54

  • Entire dorsum of alitrunk and entire side of alitrunk except for katepisternum (which is smooth) covered with flocculent or spongiform tissue, this tissue arranged in closeset raised clumps and patches which have only very narrow channels between them. (Papua New Guinea) . . . . . Strumigenys sisyrata
Strumigenys sisyrata casent0280752 p 1 high.jpg
  • Dorsum and sides of alitrunk not covered with close-set raised clumps and patches of flocculent or spongiform tissue; in general such tissue absent from alitrunk but sometimes lamella of propodeal declivity is spongiform . . . . . 56

56

return to couplet #55

  • First gastral tergite entirely covered with fine dense longitudinal sulcate sculpture; no other form of sculpture present on sclerite, differentiated basigastral costulae absent. (Fiji Is) . . . . . Strumigenys panaulax
Strumigenys panaulax casent0013149 p 1 high.jpg
  • First gastral tergite not entirely covered with longitudinal sulcate sculpture; tergite usually with basigastral costulae that may extend up to half the length of the sclerite, which is usually un sculptured posteriorly; rarely tergite entirely smooth or with another form of sculpture distal of the basigastral costulae . . . . . 57

57

return to couplet #56

  • With alitrunk in profile the propodeal declivity equipped with a broad and conspicuous lamella; the propodeal tooth may be replaced by the lamella or completely buried in the lamella, or the lamella may subtend the ventral margin of the tooth for most or all of its length; posterior (free) margin of lamella may be convex, straight or irregular but is not narrowly concave, nor is it close to and parallel with the edge of the declivity . . . . . 58
  • With alitrunk in profile the propodeal declivity equipped with a simple carina or at most a narrow cuticular flange; carina or narrow flange does not subtend the ventral margin of the tooth for most or all of its length; posterior (free) margin of carina or narrow flange concave, close to and parallel with the edge of the . . . . . 99

58

return to couplet #57

  • With head in full-face view the upper scrobe margin with two or more flagellate or filiform hairs that freely project laterally; at least with one in apicoscrobal position and another anterior to this (dorsolateral margin of occipital lobe posterior to apex of scrobe may have additional laterally projecting hairs) . . . . . 59
  • With head in full-face view the upper scrobe margin usually with a single hair that freely projects laterally, in apicoscrobal position; this hair may be flagellate, filiform, or short and stiff; sometimes without a hair in this position (dorsolateral margin of occipital lobe posterior to apex of scrobe may have laterally projecting hairs) . . . . . 62

59

return to couplet #58

  • Disc of postpetiole finely and densely longitudinally striate-costulate. Basigastral costulae longer than disc of postpetiole, extending almost half the length of the first gastral tergite. (Fiji Is) . . . . . Strumigenys chernovi
Strumigenys chernovi casent0184914 p 1 high.jpg
  • Disc of postpetiole smooth and shining. Basigastral costulae shorter than disc of postpetiole, extending much less than half the length of the first gastral tergite . . . . . 60

60

return to couplet #59

  • With head in profile standing pilosity on cephalic dorsum restricted to 1-2 pairs of erect fine flagellate hairs. Pronotal dorsum densely reticulate-punctate. (Indonesia (Tanimbar, Aru, Irian Jaya), Papua New Guinea, Solomon Is; also in Australia) . . . . . Strumigenys yaleopleura
Strumigenys yaleopleura casent0900854 p 1 high.jpg
  • With head in profile standing pilosity on cephalic dorsum of numerous short stiff hairs that arise all over the surface from the level of the eye to the occipital margin. Pronotal dorsum smooth or with superficial fine sculpture . . . . . 61

61

return to couplet #60

  • Head unsculptured and smooth mediodorsally. Hairs on leading edge of scape short, fine and soft, decumbent and strongly curved toward apex of scape, much shorter than maximum width of scape' Mesonotum with a single pair of erect hairs. Erect hairs on first gastral tergite restricted to a single basal and a single apical transverse row. (Malaysia (Sabah)) . . . . . Strumigenys hastur
Strumigenys hastur casent0102607 profile 1.jpg
  • Head entirely reticulate-punctate. Hairs on leading edge of scape elongate, stout and stiff, suberect and only shallowly curved toward apex of scape, about as long as maximum width of scape. Mesonotum with a several pairs of erect hairs. Erect hairs on first gastral tergite arising over entire sclerite, not restricted to apical and basal rows. (Taiwan) . . . . . Strumigenys liukueiensis
Strumigenys liukueiensis side (www.niaes.affrc.go.jp).jpg

62

return to couplet #58

  • Fully closed mandible in full-face view broad proximally and strikingly tapered distally, not linear or curvilinear; mandibles short, MI 28-32. Apicoscrobal hair absent and first gastral tergite with hairs restricted to extreme base and extreme apex . . . . . 63
  • Fully closed mandible in full-face view linear or curvilinear, sometimes slightly increasing in width toward base; mandibles longer, MI 34-58. Either apicoscrobal hair present, or first gastral tergite with hairs not restricted to extreme base and extreme apex, or both of these . . . . . 64

63

return to couplet #62

  • Metapleuron and side of propodeum mostly to entirely reticulate-punctate. Mesopleuron often also completely sculptured but in some a part of this sclerite may be smooth. (Papua New Guinea) . . . . . Strumigenys pulchra
Strumigenys pulchra casent0102625 profile 1.jpg
  • Metapleuron and side of propodeum glassy smooth, at most with weak sculpture around extreme periphery. Mesopleuron always glassy smooth. (Indonesia (Aru), Papua New Guinea) . . . . . Strumigenys biroi
Strumigenys biroi casent0280753 p 1 high.jpg

64

return to couplet #62

  • Metapleuron and side of propodeum evenly densely reticulate-punctate everywhere. Mesopleuron often also completely sculptured but in some a part or most of this sclerite may be smooth . . . . . 65
  • Metapleuron and side of propodeum partially to entirely smooth; often with weak punctulate sculpture around periphery or with some faint shallow superficial shagreening. Mesopleuron always glassy smooth . . . . . 75

65

return to couplet #64

  • With petiole in profile the lateral spongiform lobe small and restricted to posterior portion of node; dorsal margin of lateral spongiform lobe does not extend forward to level of anterior face of node . . . . . 66
  • With petiole in profile the lateral spongiform lobe large, not restricted to posterior portion of node; dorsal margin of lateral spongiform lobe extends across most or all of the side of the segment, approaching or reaching level of anterior face of node . . . . . 71

66

return to couplet #65

  • Pronotal humeral hair long, fine and flagellate . . . . . 67
  • Pronotal humeral hair short, stiff or stout and blunt . . . . . 70

67

return to couplet #66

  • Disc of postpetiole coarsely longitudinally costulate, spaces between costulae finely reticulate-punctate. Basigastral costulae extending about half the length of the sclerite. First gastral tergite with sparse fine flagellate hairs. (Phillipines) . . . . . Strumigenys phytibia
Strumigenys-phytibiaL5x.jpg
  • Disc of postpetiole shagreenate to reticulate-punctate, without coarse longitudinal costulae. Basigastral costulae distinctly shorter than half the length of the sclerite. First gastral tergite with numerous stiff hairs that are suberect to erect and mostly short . . . . . 68

68

return to couplet #67

  • With head in full-face view upper scrobe margin confluent with dorsolateral margin of occipital lobe, the two together forming a single evenly convex line; ventrolateral margin of head behind eye not visible in this view. Inner margin of mandible bearing a narrow translucent cuticular crest in about the median third of its length. . . . . 69
  • With head in full-face view upper scrobe margin not confluent with dorsolateral margin of occipital lobe, the two together not forming a single evenly convex line; ventrolateral margin of head behind eye visible in this view. Inner margin of mandible without a cuticular crest in about the median third of its length. (Malaysia (West Malaysia) . . . . . Strumigenys epyna
Strumigenys epyna casent0900815 p 1 high.jpg

69

return to couplet #68

  • Hairs on second gastral tergite stiff and feebly remiform. Base of first gastral tergite without flagellate hairs. Mandibles shorter, MI 38-41. (Malaysia (West Malaysia)) . . . . . Strumigenys phoenix
Strumigenys phoenix casent0900816 p 1 high.jpg
  • Hairs on second gastral tergite flagellate. Base of first gastral tergite with 1-2 pairs of flagellate hairs. Mandibles longer, MI 45-46. (Brunei) . . . . . Strumigenys zagan
Strumigenys zagan casent0900817 p 1 high.jpg

70

return to couplet #66

  • Apicoscrobal hair absent. Pronotal dorsum without a pair of erect remiform hairs between the humeral pair. Hairs on first gastral tergite spatulate, curved and strongly inclined posteriorly. (Malaysia (West Malaysia), Indonesia (Sulawesi)) . . . . . Strumigenys nesteryx
Strumigenys nesteryx casent0900818 p 1 high.jpg
  • Apicoscrobal hair present, stout. Pronotal dorsum with a pair of erect short remiform hairs between the humeral pair. Hairs on first gastral tergite remiform, suberect. (Malaysia (Sarawak)) . . . . . Strumigenys mjoebergi
Strumigenys mjoebergi casent0217954 p 1 high.jpg

71

return to couplet #65

  • Basigastral costulae dense and long, extending over at least the basal half of the first gastral tergite. (Japan) . . . . . Strumigenys strigatella
Strumigenys strigatella casent0900805 p 1 high.jpg
  • Basigastral costufae sparse and short, much shorter than half the length of the first gastral tergite . . . . . 72

72

return to couplet #71

  • Apicoscrobal hair short and stiff, not flagellate. Hairs on first gastral tergite short and fine. Mesopleuron mostly smooth. (Malaysia (Sabah)) . . . . . Strumigenys dyak
Strumigenys dyak casent0280741 p 1 high.jpg
  • Apicoscrobal hair flagellate. Hairs on first gastral tergite long and flagellate. Mesopleuron mostly or entirely sculptured . . . . . 73

73

return to couplet #73

  • Propodeal teeth in profile well developed, not entirely embedded in the lamella on the declivity, without a crest of spongiform tissue along dorsum of tooth. Propodeal teeth in dorsal view appearing cuticular. Disc of postpetiole densely reticulate-punctate. (Indonesia (Sulawesi)) . . . . . Strumigenys asrochia
Strumigenys asrochia casent0102633 profile 1.jpg
  • Propodeal teeth in profile poorly represented or vestigial, entirely embedded in the thick spongiform lamella on the declivity and with a crest of spongiform tissue along dorsum of tooth. Propodeal teeth in dorsal view appearing spongiform. Disc of postpetiole un sculptured or at most with very fine superficial markings, not densely reticulate-punctate . . . . . 74

74

return to couplet #73

  • Pronotal dorsum with 1-2 pairs of erect flagellate hairs, as well as the humeral pair. Mesonotum with 1-2 (rarely 3) pairs of erect flagellate hairs. MI 42-45, SI 85-93. (Thailand, Malaysia (West Malaysia)) . . . . . Strumigenys confusatrix
Strumigenys confusatrix casent0102638 profile 1.jpg

- Pronotal dorsum without erect flagellate hairs apart from the humeral pair. Mesonotum with a single pair of erect flagellate hairs. MI 48-53, SI 93-102. (Malaysia (West Malaysia, Sarawak, Sabah), Brunei, Indonesia (Sumatra), Philippines (Palawan)) . . . . . Strumigenys indagatrix

75

return to couplet #64

  • With alitrunk in profile dorsum of pronotum without standing hairs apart from the humeral hair . . . . . 76
  • With alitrunk in profile dorsum of pronotum with usually one other pair of standing hairs as well as the humeral hair; rarely with more than one pair . . . . . 79

76

return to couplet #75

  • Apicoscrobal hair present and long, filiform or flagellate; this hair very different in form and length from any other on the margin both anterior and posterior to it . . . . . 77
  • Apicoscrobal hair absent; entire margin with a dense row of uniformly shaped small curved hairs. (Fiji Is) . . . . . Strumigenys scelesta
Strumigenys scelesta casent0186833 p 1 high.jpg

77

return to couplet #76

  • Dorsal alitrunk entirely smooth and shining, devoid of reticulate-punctate sculpture. (India) . . . . . Strumigenys smythiesii
Strumigenys smythiesii casent0280742 p 1 high.jpg
  • Dorsal alitrunk partially to entirely reticulate-punctate . . . . . 78

78

return to couplet #77

  • In profile dorsum of promesonotum covered with a thick pelt of short curved ground pilosity, appearing weakly furry; in dorsal view sides of pronotum with a similar dense coat of short curved hairs, giving the sides a furry appearance. MI 45-48. (Sri Lanka, India, Malaysia (Sarawak, Sabah), Singapore, Indonesia (Sumatra, Krakatau, Java, Lombok, Seram, Flores, Sulawesi, Kai Besar, Aru, Tanimbar, Timor), Philippines (Mindanao, Luzon, Palawan), Papua New Guinea, Solomon Is, Vanuatu, Fiji Is, Samoa, Tonga, Marshall Is, Society Is, Caroline Is, Marquesas Is, Hawaii; also in Austral region) . . . . . Strumigenys godeffroyi
Strumigenys godeffroyi casent0060226 profile 1.jpg
  • In profile dorsum of promesonotum with sparse scattered fine ground-pilosity, not appearing furry; in dorsal view sides of pronotum without a furry appearance. MI 38-41. (Thailand) . . . . . Strumigenys nytaxis
Strumigenys nytaxis casent0102571 profile 1.jpg

79

return to couplet #75

  • Dorsum of pronotum unsculptured, mostly or entirely smooth and shining when clean . . . . . 80
  • Dorsum of pronotum sculptured; usually reticulate-punctate, less commonly densely punctate, overlaid by fine rugulae, or predominantly rugulose . . . . . 82

80

return to couplet #79

  • Dorsal surface of propodeal tooth surmounted by a crest of spongiform tissue. Eye larger, with obviously more than 5 ommatidia in total; outer arc of eye visible in full-face view. Curved small hairs that fringe upper scrobe margin slender, narrowly spatulate . . . . . 81
  • Dorsal surface of propodeal tooth not surmounted b y a crest of spongiform tissue. Eye minute, with only 3-4 ommatidia in total; eye not visible in full-face view. Curved small hairs that fringe upper scrobe margin stout, spoon-shaped. (Bhutan) . . . . . Strumigenys uberyx
Strumigenys uberyx casent0900813 p 1 high.jpg

81

return to couplet #80

  • With head in profile the pair of standing hairs that straddle the midline near the occipital margin short, simple and stiff, straight or at most only shallowly curved; at highest point of vertex the head without a pair-of erect flagellate hairs. (Malaysia (West Malaysia, Sarawak, Sabah), Singapore, Indonesia (Sumatra, Java, Bali), Philippines (Palawan)) . . . . . Strumigenys juliae
Strumigenys juliae casent0217952 p 1 high.jpg
  • With head in profile the pair of standing hairs that straddle the midline near the occipital margin disproportionately long, sub flagellate and strongly arched anteriorly; at highest point of vertex a pair of exceptionally long erect flagellate hairs present whose length is > ML. (Malaysia (Sarawak)) . . . . . Strumigenys eumekes
Strumigenys eumekes casent0900814 p 1 high.jpg

82

return to couplet #79

  • Ventral surface of petiole with a deep spongiform curtain or lobe, in profile its maximum depth equal to or greater than the height of the peduncle . . . . . 83
  • Ventral surface of petiole with a narrow spongiform strip, in profile its maximum depth

much less than the height of the peduncle. (Malaysia (West Malaysia), Indonesia (Sumatra)) . . . . . Strumigenys leptodeira

Strumigenys leptodeira casent0102614 profile 1.jpg

83

return to couplet #82

  • Pronotal humeral hair stiff, straight or only very shallowly evenly curved, relatively short . . . . . 84
  • Pronotal humeral hair flagellate, very long and slender . . . . . 86

84

return to couplet #83

  • Propodeal dorsum smooth and shining. Dorsum of petiolar peduncle and ascending (anterior) face of node margined on each side by a sharp cuticular carina; in dorsal view the carinae markedly concave through the zone where peduncle meets node, so that the pair of carinae are )(-shaped. Dorsum of petiole node unsculptured, as smooth as disc of postpetiole. (Fiji Is) . . . . . Strumigenys jepsoni
Strumigenys jepsoni casent0235852 p 1 high.jpg
  • Propodeal dorsum mostly to entirely finely reticulate-punctate. Dorsum of petiolar peduncle and ascending (anterior) face of node not margined or at most with a low weak ridge on each side; if the latter then in dorsal view the carinae are parallel in the zone where peduncle meets node. Dorsum of petiole node finely reticulate-punctate, distinctly more coarsely sculptured than disc of postpetiole . . . . . 85

85

return to couplet #84

  • First gastral tergite with erect hairs restricted to two transverse rows, one basal and one apical, the sclerite between these without standing hairs; hairs of basal transverse row flagellate. Scape shorter, SI 85-86. (Taiwan) . . . . . Strumigenys hispida
Strumigenys hispida casent0900821 p 1 high.jpg
  • First gastral tergite with erect hairs not restricted to two transverse rows, the sclerite between the basal and apical rows with standing hairs; hairs of basal transverse row stiff and simple. Scape longer, SI 98-100. (Japan, Taiwan) . . . . . Strumigenys solifontis
Strumigenys solifontis casent0280743 p 1 high.jpg

86

return to couplet #83

  • With head in full-face view a freely laterally projecting long flagellate hair present on dorsolateral margin at or very close to the occipital corner. Apicoscrobal hair also present, also long and flagellate, of the same form and length as the hair at the occipital corner . . . . . 87
  • With head in full-face view dorsolateral margin at occipital corner without a freely laterally projecting long flagellate hair (short simple or curved hairs may occur). Apicoscrobal hair present or absent, when present may be simple or flagellate but is always different in form and length from the hair at the occipital corner . . . . . 88

87

return to couplet #86

  • Cephalic ground-pilosity and pilosity that fringes upper scrobe margins simple and extremely fine. Hairs on leading edge of scape fine and simple. Head narrower and mandibles shorter, CI77, MI 34. (India) . . . . . Strumigenys habropilosa
Strumigenys habropilosa casent0102656 profile 1.jpg
  • Cephalic ground-pilosity and pilosity that fringes upper scrobe margins broadly spatulate. Hairs on leading edge of scape spatulate. Head broader and mandibles longer, CI 86, MI 39. (India) . . . . . Strumigenys hypoturba
Strumigenys hypoturba casent0102609 profile 1.jpg

88

return to couplet #86

  • With head in profile the pair of standing hairs that straddle the midline near the occipital margin disproportionately long, either flagellate or erect basally and with their apical sections abruptly angled or hooked anteriorly, or even looped . . . . . 89
  • With head in profile the pair of standing hairs that straddle the midline near the occipital margin short and stiff, straight to feebly curved and usually slightly inclined anteriorly; apical sections not abruptly angled or hooked anteriorly . . . . . 93

89

return to couplet #88

  • Dorsal margin of propodeal tooth surmounted by a shallow but conspicuous convex lobe or fringe of spongiform tissue throughout its length . . . . . 90
  • Dorsal margin of propodeal tooth free, not bearing a convex lobe or fringe of spongiform tissue . . . . . 92

90

return to couplet #89

  • Dorsal surface of petiole node and disc of postpetiole both smooth and shining, the two surfaces not contrasting. With petiole in dorsal view the node without a truncated anterior face, instead the lateral margins converging to a triangular anteromedian point. Scape relatively short, SI 74-77. (Japan, China, Taiwan) . . . . . Strumigenys minutula
Strumigenys minutula side (www.niaes.affrc.go.jp).jpg
  • Dorsal surface of petiole node sharply punctate or reticulate-punctate, disc of postpetiole smooth or with very scattered faint sculptural vestiges, the two surfaces contrasting. With petiole in dorsal view the node with a short truncated anterior face; lateral margins not converging to a triangular anteromedian point. Scape relatively long, SI 85 - > 100 . . . . . 91

91

return to couplet #90

  • Scape relatively very long, SI 105-107. Outer margin of mandible straight; inner at full closure becoming divergent proximal of preapical tooth. Head and mandibles longer and narrower, CI 63-65, MI 56-58. (Indonesia (Sumatra)) . . . . . Strumigenys chimaera
Strumigenys chimaera casent0102659 profile 1.jpg
  • Scape relatively shorter, SI 85-93. Outer margin of mandible convex; inner margins at closure remaining evenly convergent to preapical tooth. Head and mandibles shorter and broader, CI 66-70, MI 38-45. (India, Bhutan, Thailand, China, Taiwan, Malaysia (West Malaysia, Sarawak, Sabah), Indonesia (Sumatra, Java, Bali, Lombok, Sulawesi)) . . . . . Strumigenys nanzanensis
Strumigenys nanzanensis casent0280740 p 1 high.jpg

92

return to couplet #89

  • Pronotal dorsum reticulate-punctate, without superimposed longitudinal fine costulate sculpture. Dorsum of petiole node reticulate-punctate. Lamella on propodeal declivity broad, engaging propodeal tooth to its apex. SI 74-81, CI 70-73. (Indonesia (Sulawesi)) . . . . . Strumigenys vassago
Strumigenys vassago casent0102565 profile 1.jpg
  • Pronotal dorsum weakly punctate and with superimposed longitudinal fine costulate sculpture. Dorsum of petiole node smooth. lamella on propodeal declivity narrower, apex of propodeal tooth freely projecting. SI 91, CI 65-66. Indonesia (Timor)) . . . . . Strumigenys berkalial
Strumigenys berkalial casent0102660 profile 1.jpg

93

return to couplet #88

  • Scape relatively short, SI 72-75. Minute species, HL 0.43-0.48, HW 0.31-0.34, SL 0.25. With head in profile dorsal surface from level of eye to occipital margin with numerous erect short stiff straight hairs; hairs at occipital margin the same or only fractionally longer, not strongly differentiated . . . . . 94
  • Scape relatively long, SI 83-100. Larger species, HL 0.54-0.70, HW 0.37-0.48, SL-0.42. With head in profile dorsal surface from level of eye to occipital margin with reclinate to somewhat elevated ground-pilosity that may be straight or curved, but without erect stiff straight hairs; hairs at occipital margin usually distinctly differentiated . . . . . 95

94

return to couplet #93

  • Apicoscrobal hair present. With head in profile erect hairs near highest point of vertex longer than maximum diameter of eye. (Malaysia (West Malaysia), Indonesia (Sumatra, Java)) . . . . . Strumigenys datryx
Strumigenys datryx casent0102662 profile 1.jpg
  • Apicoscrobal hair absent. With head in profile erect hairs near highest point of vertex shorter than maximum diameter of eye. (Philippines (Luzo)) . . . . . Strumigenys tenitecta
Strumigenys tenitecta casent0900823 p 1 high.jpg

95

return to couplet #93

  • Dorsum of hind femur with a number of short erect simple hairs, a long erect flagellate hair may also be present close to the base. Anterior and posterior surfaces of hind femur also with short erect simple hairs. With petiole in profile anteriormost point of lateral spongiform lobe falls far posterior of level of anterior (ascending) face of node. Scape relatively longer, SI 95-100 . . . . . 96
  • Dorsum of hind femur without short erect simple hairs but with two long erect flagellate hairs, one close to the base and the other more distal. Anterior and posterior surfaces of hind femur without short erect simple hairs. With petiole in profile anteriormost point of lateral spongiform lobe reaches or very nearly reaches level of anterior (ascending) face of node. Scape relatively shorter, SI 79-89 . . . . . 97

96

return to couplet #95

  • Basigastral costulae restricted to limbus, not extending onto first gastral tergite proper. Mesonotal dorsum with 1-2 pairs of erect fine simple to flagellate hairs. Occipital margin with 2-4 hairs that are very weakly differentiated from the ground-pilosity, about equal in length but of slightly different shape and slightly more elevated. (Taiwan) . . . . . Strumigenys trada
  • Basigastral costulae traverse limbus and extend for an equal distance onto first gastral tergite proper. Mesonotal dorsum with 4 or more pairs of stout stiff hairs. Occipital margin with 4 or more stiff hairs that are very strongly differentiated from the ground-pilosity, being much longer and suberect to erect. (Taiwan) . . . . . Strumigenys lichiaensis

97

return to couplet #95

  • With head in profile the anteriorly-directed ground-pilosity hairs, from highest point of

vertex to occipital margin, are strongly curved basally so that most of the length of each hair is parallel to the cephalic outline or even curves down to the surface in its apical portion. Scape averaging slightly longer, SI 90-95. (India) . . . . . Strumigenys peraucta

Strumigenys peraucta casent0900812 p 1 high.jpg
  • With head in profile the anteriorly-directed ground-pilosity hairs, from highest point of vertex to occipital margin, are very feebly curved basally so that each hair is elevated and inclined upward away from the cephalic outline. Scape averaging slightly shorter, SI 79-89 . . . . . 98

98

return to couplet #97

  • Smaller species, HL 0.54-0.62, HW 0.37-0.43. With propodeum in profile the tooth strongly sclerotised and clearly visible within the lamella. (Malaysia (West Malaysia, Sarawak)) . . . . . Strumigenys geminata
Strumigenys geminata casent0102653 profile 1.jpg
  • Larger species, HL 0.65-0.70, HW 0.45-0.48. With propodeum in profile the tooth very feebly or not sclerotised, either faintly defined or mostly invisible within the lamella. (China, Taiwan, Japan, Russia (Kuril Is), introduced in Hawaii) . . . . . Strumigenys lewisi
Strumigenys lewisi casent0010646 profile 1.jpg

99

return to couplet #57

  • Upper scrobe margin with a narrow and deep semicircular excavation just anterior to level of eye; ventrolateral margin of head interrupted immediately in front of eye by a deep, roughly semicircular indentation in the margin; these two impressions linked by a vertical groove up the side of the head. (Papua New Guinea) . . . . . Strumigenys odalatra
Strumigenys odalatra casent0900864 p 1 high.jpg
  • Upper scrobe margin continuous, without a semicircular excavation just anterior to level of eye; ventrolateral margin of head continuous to eye or with a preocular notch or impression, but without a vertical groove up the side of the head . . . . . 100

100

return to couplet #99

  • With head in full-face view the upper scrobe margin with two or more flagellate or filiform hairs that freely project laterally; at least with one in apicoscrobal position and another anterior to this (dorsolateral margin of occipital lobe posterior to apex of scrobe may have additional laterally projecting hairs) . . . . . 101
  • With head in full-face view the upper scrobe margin usually with a single hair that freely projects laterally, in apicoscrobal position; this hair may be flagellate, filiform, or short and stiff; rarely apicoscrobal hair absent (dorsolateral margin of occipital lobe posterior to apex of scrobe may have laterally projecting hairs) . . . . . 123

101

return to couplet #100

  • Entire dorsum of petiole node, and all of side of node, completely concealed by a thick uniform bonnet-like covering of fine dense spongiform tissue. Postpetiole almost entirely obscured by fine dense spongiform tissue, only a small anteromedian patch of the disc free of spongiform tissue. (Papua New Guinea) . . . . . Strumigenys lopotyle
Strumigenys lopotyle casent0900801 p 1 high.jpg
  • Entire dorsum of petiole node visible, most of side of node visible, not entirely concealed by a bonnet of thick spongiform tissue. Postpetiolar disc visible, in dorsal view spongiform tissue confined to periphery of sclerite . . . . . 102

102

return to couplet #101

  • Disc of postpetiole blanketed with strong reticulate-punctate, costulate or rugulose sculpture; if sculpture somewhat fainter mediodorsally then either mesopleuron, or metapleuron plus side of propodeum, or both, are mostly or entirely sculptured . . . . . 103
  • Disc of postpetiole smooth to feebly superficially sculptured; if traces of superficial sculpture present on disc then either mesopleuron, or metapleuron plus side of propodeum, or both, are mostly to entirely glassy smooth . . . . . 114

103

return to couplet #102

  • Dorsal surface of occipital lobes depressed, flat or shallowly concave in profile or dorsal view and sharply marginate laterally. Scrobe obsolete behind level of eye. Ventrolateral margin of head with a distinct preocular impression. Preapical tooth of mandible very widely separated from apicodorsal tooth. Pronotum marginate laterally, dorsum and side covered with a dense pelt of short curved hairs. With petiole in profile the length of the lateral spongiform lobe at least equal to the exposed cuticle of the node. (Indonesia (Irian Jaya)) . . . . . Strumigenys domitia
  • Dorsal surface of occipital lobes not depressed, convex in profile or dorsal view and not marginate laterally. Scrobe extends posteriorly beyond level of eye. Ventrolateral margin of head without a preocular impression. Preapical tooth of mandible close to apicodorsal tooth. Pronotum not marginate laterally, without a dense pelt of short curved hairs. With petiole in profile the length of the lateral spongiform lobe less than the exposed cuticle of the node . . . . . 104

104

return to couplet #103

105

return to couplet #104

  • In dorsal view basigastral costulae much longer than disc of postpetiole. Mesopleuron entirely glassy smooth. Petiole node in dorsal view as long as broad or slightly longer than broad. (Indonesia (Seram)) . . . . . Strumigenys separa
Strumigenys separa casent0102563 profile 1.jpg
  • In dorsal view basigastral costulae shorter than disc of postpetiole. Mesopleuron mostly to entirely punctulate. Petiole node in dorsal view broader than long. (Indonesia (Kai Besar), Papua New Guinea) . . . . . Strumigenys ligur
Strumigenys ligur casent0102669 profile 1.jpg

106

return to couplet #104

  • With head in profile standing hairs on dorsum not restricted to area close to occipital margin; standing hairs numerous between occipital row and highest point of vertex, and also present anterior to this (at least to level of eye, often to level of frontal lobes) . . . . . 107
  • With head in profile standing hairs on dorsum mostly or entirely restricted to area close to occipital margin; at most with 1-2 extra pairs present between occipital row and highest point of vertex but always absent anterior to this . . . . . 111

107

return to couplet #106

  • Mesopleuron, most of metapleuron and side of propodeum smooth and shining. . . . . 108
  • Mesopleuron, metapleuron and side of propodeum densely and coarsely sculptured . . . . . 109

108

return to couplet #107

  • Pronotal dorsum and mesonotum sharply densely punctate, the two not contrasting; propodeal dorsum sculptured. With petiole node in profile height of anterior face subequal to or greater than length of dorsum. Apical funicular segment moderately constricted basally. Smaller species with shorter scapes; HL 0.56, HW 0.39, SI 72. (Thailand) . . . . . Strumigenys benulia
Strumigenys benulia casent0102636 profile 1.jpg
  • Pronotal dorsum longitudinally rugulose, mesonotum reticulate-punctate, the two contrasting; propodeal dorsum mostly smooth. With petiole node in profile height of anterior face much less than length of dorsum. Apical funicular segment not constricted basally. Larger species with longer scapes; HL 0.72, HW 0.52, SI 85. (Fiji Is) . . . . . Strumigenys daithma

109

return to couplet #107

  • Head relatively short and broad, CI 78; scape relatively short, SI 65. (Malaysia (Sabah)) . . . . . Strumigenys lebratyx
Strumigenys lebratyx casent0102613 profile 1.jpg
  • Head relatively long and narrow, CI 65-67; scape relatively long, SI 83-87 . . . . . 110

110

return to couplet #110

  • With head in full-face view freely laterally projecting hairs are present on both the dorsolateral and ventrolateral margins; those on dorsolateral margin arise from sharply defined acute triangular tubercles. Longest standing hairs on cephalic dorsum arise from highest point of vertex. (Malaysia (Sarawak), Indonesia (Sumatra)) . . . . . Strumigenys macerina
Strumigenys macerina casent0900792 p 1 high.jpg
  • With head in full-face view freely laterally projecting hairs are present on the dorsolateral margin only and do not arise from triangular tubercles. Longest standing hairs on cephalic dorsum arise from close to occipital margin. (Malaysia (Sarawak), Philippines (Luzon)) . . . . . Strumigenys mododonta
Strumigenys mododonta casent0900793 p 1 high.jpg

111

return to couplet #106

  • Mesopleuron mostly smooth and unsculptured, any punctate sculpture is confined to periphery of sclerite. In profile the anterior coxa with transverse costate sculpture . . . . . 112
  • Mesopleuron deeply punctate everywhere. In profile the anterior coxa without transverse costate sculpture . . . . . 113

112

return to couplet #111

  • A row of erect fine hairs present on both the dorsal and the ventral surface of the middle and hind femur. Hind femur relatively short, maximum length ca 0.54. Longest erect hairs on dorsal alitrunk and first gastral tergite distinctly flagellate. (Thailand) . . . . . Strumigenys paraposta
Strumigenys paraposta casent0102559 profile 1.jpg
  • A row of erect fine hairs present only on the ventral surface of the middle and hind femur, absent from the dorsal surface. Hind femur relatively long, maximum length ca 0.68. Longest erect hairs on dorsal alitrunk and first gastral tergite simple and shallowly curved, not flagellate. (Malaysia (Sabah)) . . . . . Strumigenys pliocera
Strumigenys pliocera casent0102560 profile 1.jpg

113

return to couplet #111

  • Preapical dentition of mandible a minute denticle; inner margins of mandibles touching just proximal of preapical denticle at full closure. Petiole node in profile with height of anterior face subequal to length of dorsum. Dorsal surface of hind femur without suberect fine hairs and without gland bulla visible in apical quarter. Head broader and scape shorter, CI 82-83, SI 63. (Thailand) . . . . . Strumigenys nothomopyx
Strumigenys nothomopyx casent0900800 p 1 high.jpg
  • Preapical dentition of mandible a small acutely triangular tooth; inner margins of mandibles widely separated just proximal of preapical tooth at full closure. Petiole node in profile with height of anterior face much less than length of long shallowly convex dorsum. Dorsal surface of hind femur with suberect fine hairs and with a small but conspicuous gland bulla visible in apical quarter. Head broader and scape shorter, CI 68-74, SI 71-77. (Malaysia (Sarawak, Sabah), Indonesia (Sumatra)) . . . . . Strumigenys natynion
CASENT0102558 Strumigenys natynion p 1 high.jpg

114

return to couplet #102

  • With head in full-face view the upper scrobe margin with 5 or more flagellate or long fine filiform hairs that freely project laterally (dorsolateral margin of occipital lobe posterior to apex of scrobe may have additional laterally projecting hairs). (Malaysia (Sarawak)) . . . . . Strumigenys rhadina
Strumigenys rhadina casent0102582 profile 1.jpg
  • With head in full-face view the upper scrobe margin with only two flagellate or long fine filiform hairs that freely project laterally; one in apicoscrobal position and another anterior to this (dorsolateral margin of occipital lobe posterior to apex of scrobe may have additional laterally projecting hairs) . . . . . 115

115

return to couplet #114

  • Anterior clypeal margin with a deep narrow median notch or impression that is narrowly U-shaped or V-shaped. Scape relatively long, SI > 80. Apical segment of funiculus long and narrow, spindle-shaped, basally tapering to a very narrow neck at its articulation with the preapical segment . . . . . 116
  • Anterior clypeal margin transverse or broadly evenly shallowly concave across its entire width, without a deep median notch. Scape relatively short, SI < 80. Apical segment of funiculus not long and narrow, not spindle-shaped, not or only moderately tapering basally to its articulation with the preapical segment . . . . . 122

116

return to couplet #115

  • Preapical tooth of mandible spiniform and shallowly curved, its length about one-third greater than the maximum width of the mandible. (China, Vietnam) . . . . . Strumigenys rallarhina
Strumigenys rallarhina casent0900839 p 1 high.jpg
  • Preapical tooth of mandible varying from a denticle to a triangular tooth but not spiniform, the tooth shorter than the maximum width of the mandible, usually distinctly shorter . . . . . 117

117

return to couplet #116

  • Inner margin of mandible forming a more or less straight line from its base to the apex of the preapical tooth, or short preapical tooth strongly inclined toward mandibular apex. Proximal margin of preapical tooth a continuation of line of inner margin of mandible proximal to it, or at most only feebly diverging from it; preapical tooth small or scarcely more than a prominent angle and not directed medially. (China, Taiwan) . . . . . Strumigenys formosensis
Strumigenys formosensis casent0280747 p 1 high.jpg
  • Inner margin of mandible not forming a straight line from its base to the apex of the preapical tooth; preapical tooth not strongly inclined toward mandibular apex. Proximal margin of preapical tooth diverging strongly from line of inner margin of mandible proximal to it; preapical tooth directed medially or nearly so . . . . . 118

118

return to couplet #117

  • Species with very long narrow head and extremely elongated scape; HL 0.99-1.01, CI 44-48, SL 0.70, SI 146-159. (Malaysia (Sarawak); Indonesia (Sumatra)) . . . . . Strumigenys barylonga
Strumigenys barylonga casent0900841 p 1 high.jpg
  • Species with shorter and broader head and shorter scape; HL < 0.90, CI > 50, SL < 0.60, SI < 130 . . . . . 119

119

return to couplet #118

  • Preapical tooth very small, in full-face view its length one-quarter or less of the width of the mandible at the point where the tooth arises. (Burma, Thailand) . . . . . Strumigenys feae
Strumigenys feae casent0280748 p 1 high.jpg
  • Preapical tooth larger, in full-face view its length half or more of the width of the mandible at the point where the tooth arises . . . . . 120

120

return to couplet #119

  • Species combining longer narrower head with longer scape, CI 52-60, SI > 110. (Thailand, Malaysia (West Malaysia, Sabah), Singapore, Indonesia (Sumatra, Java, Bali)) . . . . . Strumigenys kraepelini
Strumigenys kraepelini casent0280749 p 1 high.jpg
  • Species combining shorter broader head with shorter scape, CI > 60, SI < 105 (usually SI < 100) . . . . . 121

121

return to couplet #120

  • In full-face view outer margin of mandible straight from near clypeal margin to level of preapical tooth; inner margin between same points also straight or even slightly convex. Mandibles and scapes averaging slightly longer, MI 45-49, SI 97-104. (China, Japan) . . . . . Strumigenys stenorhina
Strumigenys stenorhina casent0900840 p 1 high.jpg
  • In full-face view outer margin of mandible shallowly convex from near clypeal margin to level of preapical tooth; inner margin between same points usually shallowly concave, more rarely approximately straight. Mandibles and scapes averaging slightly shorter, MI 42-45, SI 93-96 (India, Nepal, Bhutan, Thailand, China, Japan, Wallis Is) . . . . . Strumigenys exilirhina
Strumigenys exilirhina casent0102650 profile 1.jpg

122

return to couplet #115

  • Larger species with longer mandibles, HL 0.70 or more, MI > 45. Preapical dentition of mandible represented only by a small denticle. Dorsum of head covered with small fine reticulate-rugulose enclosures whose bases are filled with fine dense reticulate-punctate sculpture. (Taiwan) . . . . . Strumigenys lacunosa
Strumigenys lacunosa casent0900797 p 1 high.jpg
  • Smaller species with shorter mandibles, HL 0.43-0.48, MI 30-33. Preapical dentition of mandible represented by a strongly defined spiniform tooth. Dorsum of head covered with strong reticulate-punctate sculpture, without reticulate-rugulose enclosures. (Indonesia (Sulawesi)) . . . . . Strumigenys furfara
Strumigenys furfara casent0102652 p 1 high.jpg

123

return to couplet #100

  • In full-face view anterior clypeal margin with a deep U-shaped or V-shaped median notch or indentation, margin not transverse nor very shallowly evenly concave from side to side. Ventrolateral margin of head with a preocular notch or impression . . . . . 124
  • In full-face view anterior clypeal margin transverse or very shallowly evenly concave from side to side, without a deep median notch or indentation. Ventrolateral margin of head continuous to eye, without a preocular notch or impression . . . . . 126

124

return to couplet #123

  • Disc of postpetiole mostly to entirely smooth and shining, without reticulate or reticulate-punctate sculpture, at most with a few very short longitudinal rugulae near anterior margin. (Papua New Guinea) . . . . . Strumigenys nysu
Strumigenys nysu casent0900849 p 1 high.jpg
  • Disc of postpetiole mostly to entirely reticulate or reticulate-punctate, disc may also have longitudinal rugulae crossing part or most of its length . . . . . 125

125

return to couplet #124

  • Larger species with narrower head and longer scape; HL 0.69, CI 62, SI 102. (Indonesia (Irian Jaya)) . . . . . Strumigenys montu
  • Smaller species with broader head and shorter scape; HL 0.54-0.60, CI 65-70, SI 89-94. (Papua New Guinea; also in Australia) . . . . . Strumigenys racabura
Strumigenys racabura casent0900847 p 1 high.jpg

126

return to couplet #123

  • Mesonotum with 3-4 pairs of erect fine hairs. Hairs arising all over first gastral tergite, not restricted to a single transverse row at the apex of the sclerite and another transverse row at its base. Petiole in profile long and low, the node with a very short anterior face or without a differentiated anterior face . . . . . 127
  • Mesonotum with 1 pair of erect fine hairs. Hairs on first gastral tergite restricted to a transverse row at the apex of the sclerite and another transverse row at its base. Petiole in profile nodiform, the node with a strongly differentiated anterior face . . . . . 128

127

return to couplet #126

  • Promesonotal dorsum longitudinally rugulose. Metapleuron and side of propodeum mostly to entirely sculptured. Dorsum of propodeum not rounding smoothly and evenly into declivity, the two surfaces separated by a transverse angle or weak carina between the propodeal teeth. Larger species with longer mandibles and shorter scapes, HL 0.80-0.86, MI 45-49, SI 73-76. (Thailand) . . . . . Strumigenys dipsas
Strumigenys dipsas casent0102643 profile 1.jpg
  • Promesonotal dorsum reticulate-punctate. Metapleuron and side of propodeum entirely smooth. Dorsum of propodeum rounding smoothly and evenly into declivity, the two surfaces not separated by a transverse angle or carina between the propodeal teeth. Smaller species with shorter mandibles and longer scapes, HL 0.60, MI 37, SI 83. (Fiji Is) . . . . . Strumigenys ekasura
Strumigenys ekasura casent0184678 p 1 high.jpg

128

return to couplet #126

  • Apical (sixth) antennal segment strongly constricted basally and forming a very narrow articulation with preapical segment. Hairs on first and second gastral tergites long, fine and flagellate. Mandibles and scapes longer, MI 47-50, SI 77-82 . . . . . 129
  • Apical (sixth) antennal segment broad basally, broadly articulated with preapical segment. Hairs on first and second gastral tergites short, erect and simple. Mandibles and scapes shorter, MI 30-33, SI 55-59. (Indonesia (Sulawesi)) . . . . . Strumigenys dantalion
Strumigenys dantalion casent0102641 profile 1.jpg

129

return to couplet #128

  • Dorsal (outer) surface of hind basitarsus with 1 erect long flagellate hair; hind tibia without a similar hair. With petiole in profile height of anterior face of node less than length of dorsum. Dorsum of petiole node and disc of postpetiole equally sharply and densely reticulate-punctate. Head and alitrunk yellowish brown, gaster darker. (Papua New Guinea) . . . . . Strumigenys paimon
Strumigenys paimon casent0900850 p 1 high.jpg
  • Dorsal (outer) surface of hind basi tarsus with 2 erect long flagellate hairs; hind tibia with a single similar hair. With petiole in profile height of anterior face of node greater than length of dorsum. Dorsum of petiole node usually more sharply and densely sculptured than disc of postpetiole. Head, alitrunk and gaster dark brown to blackish brown. (Papua New Guinea, Solomon Is) . . . . . Strumigenys frivaldszkyi
Strumigenys frivaldszkyi casent0178456 profile 1.jpg

130

return to couplet #54

  • Fully closed mandible in full-face view very broad proximally and strikingly tapered distally, not linear or curvilinear. Outer margin of mandible flared outwards or strongly convex prebasally, the mandible not straight, not evenly convex, not evenly bowed outwards. In ventral view outer margin of mandible distal of level of anterior clypeal margin abruptly changing direction . . . . . 131
  • Fully closed mandible in full-face view usually obviously linear or curvilinear, sometimes slightly increasing in width toward base, sometimes with a minute inflection immediately in front of the clypeal margin. Outer margin of mandible not flared outwards or strongly convex prebasally, mandible either straight, evenly convex or evenly bowed outwards. In ventral view outer margin of mandible forms a more or less continuous line that does not abruptly change direction distal of level of anterior clypeal margin . . . . . 140

131

return to couplet #130

  • Disc of postpetiole unsculptured, smooth and shining. Metapleuron and side of propodeum unsculptured; mesopleuron always smooth . . . . . 132
  • Disc of postpetiole sculptured, usually finely and densely reticulate-punctate. Metapleuron and side of propodeum always reticulate-punctate; mesopleuron usually also with the same sculpture . . . . . 139

132

return to couplet #131

133

return to couplet #132

  • Dorsum of promesonotum reticulate-punctate or with fine sharp punctulate sculpture, at least in part . . . . . 134

134

return to couplet #133

  • First gastral tergite with a pair of stout standing hairs basally and another pair apically. Dorsum of promesonotum entirely densely reticulate-punctate. (Malaysia (West Malaysia)) . . . . . Strumigenys panopla
Strumigenys panopla casent0102577 profile 1.jpg
  • First gastral tergite entirely lacking standing hairs. Dorsum of promesonotum partially to mostly with fine small scattered punctulae. (Indonesia (Sumatra)) . . . . . Strumigenys loricata
Strumigenys loricata casent0102671 profile 1.jpg

135

return to couplet #133

  • Dorsum of head almost entirely smooth and shining, at most with fine superficial reticular patterning or widely scattered tiny punctulae . . . . . 136
  • Dorsum of head finely and densely reticulate-punctate . . . . . 137

136

return to couplet #135

  • Propodeal declivity with a broad lamella that extends to the apex of the propodeal tooth. Mesonotum without standing hairs. Upper scrobe margin fringed with spoon-shaped curved hairs. (Malaysia (Sabah)) . . . . . Strumigenys strenosa
Strumigenys strenosa casent0102578 profile 1.jpg
  • Propodeal declivity with a fine carina, without a lameIla, the propodeal tooth free. Mesonotum with a pair of stiff erect simple hairs. Upper scrobe margin without spoon-shaped curved hairs. (Fiji Is) . . . . . Strumigenys basiliska
Strumigenys basiliska casent0013153 p 1 high.jpg

137

return to couplet #135

  • Preapical tooth of mandible at least as long as the maximum mandibular width in full-face view. Cephalic dorsum with very sparse, appressed narrowly spatulate ground pilosity that is inconspicuous. First gastral tergite with apical and basal pairs of standing hairs present. (Malaysia (West Malaysia), Indonesia (Sumatra)) . . . . . Strumigenys prosopis
  • Preapical tooth of mandible much shorter than the maximum mandibular width in full-face view. Cephalic dorsum with dense, very broadly spatulate appressed ground pilosity

that is very conspicuous. First gastral tergite entirely lacking standing hairs. (Indonesia (Aru, Kai Besar), Papua New Guinea, Solomon Is, also in Australia) . . . . . Strumigenys undras

Strumigenys undras casent0102672 profile 1.jpg

138

return to couplet #132

  • Dorsum of pronotum with erect hairs as well as the humeral pair. Cephalic dorsum with a transverse row of 6-8 standing hairs at the occipital margin and with other short standing hairs between this row and highest point of vertex. (Malaysia (Sabah)) . . . . . Strumigenys propinqua
Strumigenys propinqua casent0102580 profile 1.jpg
  • Dorsum of pronotum without erect hairs except for the humeral pair. Cephalic dorsum with a single pair of short standing hairs, located on occipital margin close to posterolateral corners. (Indonesia (Sumatra)) . . . . . Strumigenys anchiplex
Strumigenys anchiplex casent0102670 profile 1.jpg

139

return to couplet #131

  • Dorsal surfaces of pronotum and mesonotum with numerous short straight erect stubbly hairs; similar hairs also present on dorsolateral margins of mesonotum. Scape relatively short and head broader, SI 52, CI 82; hind femur short, much less than HW. (Indonesia (Sulawesi)) . . . . . Strumigenys elapoma
Strumigenys elapoma casent0900767 p 1 high.jpg
  • Dorsal surfaces of pronotum and mesonotum without erect hairs; dorsolateral margins of the mesonotum either hairless or at most with 2-3 short erect hairs. Scape relatively long and head narrower, SI 67-71, CI 68-71; hind femur elongate, about equal to HW. (Malaysia (Sabah)) . . . . . Strumigenys morphica
Strumigenys morphica casent0102581 profile 1.jpg

140

return to couplet #130

  • Preapical tooth arises from the dorsal surface of the mandible a notable distance away from the inner margin; from its point of origin the tooth arches medially and passes above the inner mandibular margin . . . . . 141
  • Preapical tooth or denticle arises from the inner margin of the mandible and is directed medially, or slightly dorsomedially, or is inclined toward the apicodorsal tooth . . . . . 145

141

return to couplet #140

  • Ventral surface of head without a transverse impression or groove immediately in front of the eye. (Malaysia (Sarawak)) . . . . . Strumigenys fuarda
Strumigenys fuarda casent0900783 p 1 high.jpg
  • Ventral surface of head with a transverse impression or groove immediately in front of the eye that extends toward the ventral midline or traverses the entire width of the head . . . . . 142

142

return to couplet #141

  • With head in full-face view the upper scrobe margins suddenly constricted by a deep indentation on each side j ust in front of the level of the eye. Ventral surface of head with a postbuccal groove that traverses its width and posterior to this, immediately in front of eye, with a second (preocular) impression that extends from the ventrolateral margin toward the midline, but does not reach the midline. (Indonesia (Seram, Aru, Salawati, Irian Jaya), Papua New Guinea, Solomon Is; also in Australia) . . . . . Strumigenys chyzeri
Strumigenys chyzeri casent0106249 p 1 high.jpg
  • With head in full-face view the upper scrobe margins continuous, not suddenly constricted by deep indentations just in front of the level of the eye. Ventral surface of head with a single broad deep groove that traverses its entire width and occupies all the space between the posterior margin of the buccal cavity and the level of the eyes . . . . . 143

143

return to couplet #142

  • Pronotal humeral hair absent. Leading edge of scape straight or even slightly concave in its median third. Base of propodeal declivity without a prominent cuticular lobe. (Indonesia (Aru, Irian Jaya), Papua New Guinea) . . . . . Strumigenys wallacei
Strumigenys wallacei casent0280738 p 1 high.jpg
  • Pronotal humeral hair present. Leading edge of scape convex in its median third. Base of propodeal declivity with a prominent cuticular lobe . . . . . 144

144

return to couplet #143

  • Dorsum of head without erect stout hairs. Pronotal humeral hair very short and stoutly clavate. Promesonotal dorsum without stout erect remiform hairs; ground-pilosity dense, broadly spatulate and closely applied to surface. Disc of postpetiole mostly or entirely smooth. CI 93-96, SI 56-59. (Thailand, Malaysia (West Malaysia, Sarawak), Indonesia (Kalimantan, Sumatra, Lombok)) . . . . . Strumigenys gnathosphax
Strumigenys gnathosphax casent0102655 profile 1.jpg
  • Dorsum of head with erect stout hairs at least near occipital margin. Pronotal humeral hair remiform, long and stiff. Promesonotal dorsum with 4 pairs of stout erect remiform hairs; ground-pilosity sparse, spatulate. Disc of postpetiole mostly or entirely reticulate-punctate. CI 76-82, SI 78-85. (Malaysia (Sarawak)) . . . . . Strumigenys diasphax
Strumigenys diasphax casent0102642 profile 1.jpg

145

return to couplet #140

  • Pronotal humeral hair present; may be simple, clavate, remiform or flagellate . . . . . 155

146

return to couplet #145

  • Inner margin of mandible with a broad translucent cuticular lamella that at its broadest is only slightly narrower than the length of the preapical tooth . . . . . 147
  • Inner margin of mandible without a broad translucent cuticular lamella . . . . . 148

147

return to couplet #146

  • Hairs on first gastral tergite restricted to a transverse row at extreme base, the hairs short, flattened and inclined anteriorly. Dorsum of head and pronotum without suborbicular hairs. With petiole in profile the lateral spongiform lobe extends almost the length of the side of the node. Pronotal dorsum smooth. (Malaysia (Sabah)) . . . . . Strumigenys forficata
Strumigenys forficata casent0280746 p 1 high.jpg
  • Hairs on first gastral tergite distributed over entire sclerite, the hairs stout and erect. Dorsum of head and pronotum densely clothed with suborbicular hairs that are closely applied to the surface. With petiole in profile the lateral spongiform lobe restricted to posterior margin of side of node. Pronotal dorsum reticulate-punctate. (Indonesia (Kai Besar), Papua New Guinea) . . . . . Strumigenys horvathi
Strumigenys horvathi casent0102667 profile 1.jpg

148

return to couplet #146

  • Preapical dentition of mandible a spiniform tooth that is at least nearly as long as the maximum width of the mandible in full-face view . . . . . 149
  • Preapical dentition of mandible a denticle or minute tooth that is only a small fraction of the maximum width of the mandible in full-face view . . . . . 153

149

return to couplet #148

  • First gastral tergite at least with a pair of standing hairs basally and another pair apically. Disc of postpetiole with a pair of standing hairs . . . . . 150
  • First gastral tergite without standing hairs. Disc of postpetiole without standing hairs . . . . . 152

150

return to couplet #149

  • Dorsal alitrunk coarsely longitudinally sulcate, with a ploughed appearance. Disc of postpetiole longitudinally sulcate, sulci narrower and finer than on alitrunk. Cephalic dorsum coarsely longitudinally rugose. Ventral spongiform curtain of petiole narrow, at maximum only a fraction the depth of the peduncle. (Fiji Is) . . . . . Strumigenys sulcata
Strumigenys sulcata casent0013152 p 1 high.jpg
  • Dorsal alitrunk densely reticulate-punctate. Disc of postpetiole without sulcate sculpture. Cephalic dorsum sharply and densely reticulate-punctate. Ventral spongiform curtain of petiole deep, at maximum at least equal to the depth of the peduncle . . . . . 151

151

return to couplet #150

  • Dorsal surfaces of head and promesonotum without standing hairs. Katepisternum, metapleuron and side of propodeum reticulate-punctate. Hairs on postpetiole and first gastral tergite flagellate. With head in profile scrobe present behind level of eye, with a well defined upper margin. (Papua New Guinea) . . . . . Strumigenys ortholex
Strumigenys ortholex casent0900836 p 1 high.jpg
  • Dorsal surfaces of head and promesonotum with sparse standing hairs. Katepisternum smooth, metapleuron and side of propodeum with an extensive smooth patch. Hairs on postpetiole and first gastral tergite simple, short and stiff. With head in profile scrobe obsolete behind level of eye, without a well defined upper margin. (Fiji Is) . . . . . Strumigenys praefecta
Strumigenys praefecta casent0013151 p 1 high.jpg

152

return to couplet #149

  • First gastral tergite unsculptured except for basal costulae. Lamella on propodeal declivity broad, only extreme apex of tooth free of the lamella. Petiole node in dorsal view longer than broad. Preapical tooth on mandible separated from apicodorsal tooth by a distance about equal to the length of the preapical tooth. (Philippines (Luzon, Mindoro, Negros, Jolo)) . . . . . Strumigenys esrossi
Strumigenys-esrossiL5.0x.jpg
  • First gastral tergite entirely covered with longitudinal dense silky striolate-punctulate sculpture. Lamella on propodeal declivity vestigial, only extreme base of tooth engaging the lamella. Petiole node in dorsal view broader than long. Preapical tooth on mandible adjacent to apicodorsal tooth, distance separating them less than one-third the length of the preapical tooth. (Indonesia (Sulawesi)) . . . . . Strumigenys degonya
Strumigenys degonya casent0900835 p 1 high.jpg

153

return to couplet #148

  • Disc of postpetiole entirely smooth and shining (when clean). Ventral surface of mandible without a visible gland bulla. Apical antennal segment slightly tapering basally. Head broader and scape shorter, CI 85-90, SI 53-57. (Malaysia (Sarawak), Brunei) . . . . . Strumigenys offina
Strumigenys offina casent0900868 p 1 high.jpg
  • Disc of postpetiole mostly or entirely reticulate-punctate, at most with a small mediodorsal patch where sculpture is reduced. Ventral surface of mandible with a conspicuous gland bulla. Apical antennal segment strongly constricted and very narrow basally. Head narrower and scape longer, CI 78-79, SI > 65 . . . . . 154

154

return to couplet #153

  • Anterior clypeal margin with a broad deep V-shaped impression. In full-face view preapical denticle of mandible is at the proximal commencement of the concave section of the inner margin of the mandible in its apical quarter (Le. Preapical denticle precedes the concave part of the margin). Reticulate-punctate sculpture on postpetiole disc somewhat effaced mediodorsally. Larger species with longer scape; HL 0.80-0.81, SI 82-83. (Indonesia (Sulawesi)) . . . . . Strumigenys omopyx
Strumigenys omopyx casent0900858 p 1 high.jpg
  • Anterior clypeal margin evenly shallowly concave. In full-face view preapical denticle of mandible is distal to the commencement of the concave section of the inner margin of the mandible in its apical quarter (Le. preapical denticle is on the concave part of the margin). Reticulate-punctate sculpture on postpetiole disc uniformly dense everywhere. Smaller species with shorter scape, HL 0.66, SI 69. (Philippines (Luzon)) . . . . . Strumigenys rantan
Strumigenys rantan casent0900859 p 1 high.jpg

155

return to couplet #145

  • Preapical dentition of mandible a slender spiniform tooth that is always longer than the width of the mandible at the point where it arises; preapical tooth usually at least as long as the maximum width of the mandible (discounting any lamella that may be present on inner margin) . If slightly shorter than maximum mandible width then in full-face view the inner mandibular margin, in the section of its length proximal of the apicodofsal tooth, continues the line of the inner margin from its base . . . . . 156
  • Preapical dentition of mandible varying from a minute denticle to a conical stout tooth, usually shorter than width of the mandible at the point where it arises, usually distinctly shorter than the maximum width of the mandible (discounting any lamella that may be present on inner margin). If subequal to maximum mandible width then in full-face view the inner mandibular margin, in the section of its length proximal of the apicodorsal tooth, is concave with respect to the line of the inner margin from its base . . . . . 183

156

return to couplet #155

  • Cephalic dorsum without standing hairs of any form. Dorsum and dorsolateral margins of head, and entire promesonotal dorsum, densely clothed with short, broadly spatulate to spoon-shaped ground-pilosity that is curved anteriorly. (Papua New Guinea) . . . . . Strumigenys snellingi
Strumigenys snellingi casent0900784 p 1 high.jpg
  • Cephalic dorsum with standing hairs, at least close to the occipital margin. Dorsum and dorsolateral margins of head, and entire promesonotal dorsum, without dense broadly spatulate to spoon-shaped ground-pilosity . . . . . 157

157

return to couplet #156

  • With alitrunk in profile the propodeal declivity equipped with a simple cuticular carina or at most a narrow crest; posterior (free) margin of carina or crest narrowly concave, close to and paralleling the concave shape of the edge of the declivity. . . . . . 158
  • With alitrunk in profile the propodeal declivity equipped with a broad lamella; posterior (free) margin of lamella may be convex, vertical or irregular but is not narrowly concave, nor does it closely parallel the concave shape of the edge of the declivity . . . . . 172</ span>

158

return to couplet #157

  • Ventrolateral margin of head immediately in front of the eye with an abrupt and very conspicuous preocular notch or indentation . . . . . 159
  • Ventrolateral margin of head immediately in front of the eye without an abrupt and very conspicuous preocular notch or indentation, the margin approximately straight or very shallowly evenly concave . . . . . 165

159

return to couplet #158

  • Very large species, HL > 1. 25, HW > 0.95. Side of alitrunk entirely reticulate-punctate. Scrobe absent behind level of eye. In full-face view dorsolateral margin of head strongly sinuate from frontal lobe to level of posterior margin of eye: convex at frontal lobe, concave immediately behind frontal lobe, convex posterior to this to level of start of preocular notch then again concave above the preocular notch. (Fiji Is) . . . . . Strumigenys nidifex
Strumigenys nidifex casent0171047 p 1 high.jpg
  • Much smaller species, HL < 0.95, HW < 0.70. Side of alitrunk at least with a smooth patch on katepisternum. Scrobe present behind level of eye. In full-face view dorsolateral margin of head not sinuate from frontal lobe to level of posterior margin of eye, instead the margin behind the convexity of the frontal lobe straight to shallowly concave and evenly diverging posteriorly . . . . . 160

160

return to couplet #159

  • Upper scrobe margin with two laterally projecting stiff hairs, one immediately behind level of eye and the other in apicoscrobal position. With head in profile the dorsal outline conspicuously indented, concave from j ust behind the highest point to close to the occipital margin. Petiole node in dorsal view much longer than broad; in profile the anterior face of the node much shorter than the length of its dorsum. (Indonesia (Irian Jaya)) . . . . . Strumigenys fricta
  • Upper scrobe margin with a single laterally projecting hair, in apicoscrobal position. With head in profile the dorsal outline convex from just behind the highest point to close to the occipital margin. Petiole node in dorsal view at most as long as broad, usually broader than long; in profile the anterior face of the node at least equal to the length of its dorsum . . . . . 161

161

return to couplet #160

  • Propodeum armed with a pair of very long slender needle-like spines that may be straight or very shallowly curved; length of spines greater than dorsal width of petiole node, approaching width of postpetiole disc. (Papua New Guinea) . . . . . Strumigenys hoplites
Strumigenys hoplites casent0280750 p 1 high.jpg
  • Propodeum armed with a pair of teeth or short narrowly triangular spines; length of spines less than dorsal width of petiole node, very much less than width of postpetiole disc . . . . . 162

162

return to couplet #161

  • Dark brown to blackish-brown species. Propodeum armed with a pair of short or very short teeth, length of tooth less than distance separating their bases. Scape relatively long, SI > 95. (Papua New Guinea) . . . . . Strumigenys akhtoi
Strumigenys akhtoi casent0102629 profile 1.jpg
  • Yellow to light brown species. Propodeum armed with a pair of short spines, length of spine at least equal to distance separating their bases. Scape relatively short, SI < 95 . . . . . 163

163

return to couplet #162

  • Minute species, HL 0.52-0.60, HW 0.37-0.41, SL 0.32-0.38. Katepisternum mostly to entirely smooth; metapleuron and side of propodeum partially to entirely smooth. Fine hairs that are flagellate, looped apically or sinuate present at pronotal humerus, mesonotal dorsum, second gastral tergite or in two or all of these locations (hairs easily broken or abraded away). (Indonesia (Sulawesi, Seram, Tanimbar, Kai Besar, Aru, Irian Jaya), Papua New Guinea, also in Australia) . . . . . Strumigenys mayri
Strumigenys mayri casent0173561 profile 1.jpg
  • Larger species, HL 0.67-0.72, HW 0.46-0.50, SL 0.40-0.50. Katepisternum mostly sculptured, with a small smooth patch medially; metapleuron and side of propodeum entirely reticulate-punctate. Stiff, simple hairs present at pronotal humerus, mesonotal dorsum and second gastral tergite, without flagellate or looped hairs at any of these locations . . . . . 164

164

return to couplet #163

  • Scapes relatively long, SI 98-102. Head averaging slightly narrower and mandibles slightly longer, CI 68-69, MI 50-54. Maximum length of hind femur greater than HW (1.10 X HW or more). (Papua New Guinea, also in Australia) . . . . . Strumigenys ferocior
Strumigenys ferocior casent0280751 p 1 high.jpg
  • Scapes relatively short, SI 84-88. Head averaging slightly broader and mandibles slightly shorter, CI 72-75, MI 47-49. Maximum length of hind femur less than HW (0.98 X HW or less). (Indonesia (Irian Jaya)) . . . . . Strumigenys missina
Strumigenys missina casent0900846 p 1 high.jpg

165

return to couplet #158

  • Pronotal dorsum mostly or entirely unsculptured, smooth and shining; at most with scattered fine superficial punctures but not densely reticulate-punctate . . . . . 166
  • Pronotal dorsum densely coarsely and evenly reticulate-punctate or reticulate-rugulose everywhere . . . . . 167

166

return to couplet #165

  • Apical segment of antenna spindle-shaped, very strongly constricted basally. Propodeum with a pair of minute triangular tubercles. Petiole node in dorsal view longer than broad. (Indonesia (Irian Jaya)) . . . . . Strumigenys ecliptacoca
Strumigenys ecliptacoca casent0217950 p 1 high.jpg
  • Apical segment of antenna not spindle-shaped, not constricted basally. Propodeum with a pair of strong triangular teeth. Petiole node in dorsal view broader than long. (Malaysia (West Malaysia)) . . . . . Strumigenys izepara
Strumigenys izepara casent0102612 profile 1.jpg

167

return to couplet #165

  • Small species with relatively short mandibles and short scape; HL 0.45-0.48, ML 0.16-0.17, MI 35-38, SI 54-58. (Papua New Guinea, Solomon Is) . . . . . Strumigenys mocsaryi
Strumigenys mocsaryi casent0280745 p 1 high.jpg
  • Larger species with relatively long mandibles and long scape; HL > 0.50, ML > 0.20, MI > 40, SI > 70 . . . . . 168

168

return to couplet #167

  • Mesopleuron, metapleuron and side of propodeum evenly regularly reticulate-punctate, without a smooth area anywhere. (Malaysia (West Malaysia)) . . . . . Strumigenys gabarys
Strumigenys gabarys casent0900832 p 1 high.jpg
  • Mesopleuron, metapleuron and side of propodeum not evenly regularly reticulate-punctate, with a smooth area at least on katepisternum . . . . . 169

169

return to couplet #168

  • Anterior clypeal margin in full-face view with a deep, narrowly U-shaped to V-shaped median impression. With petiole in profile the ventral spongiform strip very shallow, much less than depth of peduncle. Apical (sixth) antennomere constricted basally before its articulation with the preapical segment. (India) . . . . . Strumigenys fixata
Strumigenys fixata casent0102651 profile 1.jpg
  • Anterior clypeal margin in full-face view very shallowly broadly evenly concave. With petiole in profile the ventral spongiform strip deep, equal to or greater than depth of peduncle. Apical (sixth) antennomere basally narrowing only very slightly to its articulation with the preapical segment . . . . . 170

170

return to couplet #169

  • Proximal half of inner margin of mandible with a narrow cuticular crest. Dorsolateral margin of occipital lobe with a row of 4-5 stiffly projecting stout hairs. Metapleuron and side of propodeum reticulate-punctate. Propodeal declivity with a narrow spongiform lamella. Scapes shorter, SI 72-78. (Malaysia (Sabah)) . . . . . Strumigenys sytaria
Strumigenys sytaria casent0102564 profile 1.jpg
  • Proximal half of inner margin of mandible without a cuticular crest. Dorsolateral margin of occipital lobe without a row of 4-5 stiffly projecting stout hairs. Metapleuron and side of propodeum partially to mostly smooth. Propodeal declivity with a fine cuticular carina only, without a lamella. Scapes longer, SI 84-92 . . . . . 171

171

return to couplet #170

  • Cephalic dorsum with a pair of erect hairs in front of highest point of vertex. Pronotal dorsum with erect hairs in addition to the humeral pair; humeral hair short stiff and simple. Dorsum of head and pronotum finely and densely reticulate-punctate. Disc of postpetiole smooth. (Samoa, Fiji Is) . . . . . Strumigenys mailei
Strumigenys mailei casent0186741 p 1 high.jpg
  • Cephalic dorsum without a pair of erect hairs in front of highest point of vertex. Pronotal dorsum without erect hairs in addition to the humeral pair; humeral hair long fine and flagellate. Dorsum of head and pronotum finely and densely but chaotically punctulate-rugulose. Disc of postpetiole sculptured. (Fiji Is) . . . . . Strumigenys frivola
Strumigenys frivola casent0013150 p 1 high.jpg

172

return to couplet #157

  • Pronotal humeral hair fine, long and flagellate or looped. Apical antennal segment markedly constricted or attenuated basally and forming a narrow peduncle or neck before its articulation with preapical segment . . . . . 173
  • Pronotal humeral hair stiff, simple, remiform or spatulate. Apical antennal segment gradually slightly narrowing to base or broadly articulated with preapical segment . . . . . 177

173

return to couplet #172

  • Scape very long, SI > 100; head long and narrow, CI 58-59. Mandible without intercalary denticles between apicodorsal and apicoventral teeth. (Malaysia (Sarawak)) . . . . . Strumigenys leptorhina
Strumigenys leptorhina casent0900838 p 1 high.jpg
  • Scape shorter, SI 80-88; head shorter and broader, CI 68-73. Mandible with one or two intercalary denticles between apicodorsal and apicoventral teeth . . . . . 174

174

return to couplet #173

  • Metapleuron and side of propodeum densely reticulate-punctate. (Malaysia (Sabah)) . . . . . Strumigenys baal
Strumigenys baal casent0102634 profile 1.jpg
  • Metapleuron and side of propodeum smooth and shining . . . . . 175

175

return to couplet #174

  • Apicoscrobal hair present, distinctly different in form from any hair that precedes or follows it on the dorsolateral margin of the head. (Malaysia (Sabah), Indonesia (Sumatra)) . . . . . Strumigenys edaragona
Strumigenys edaragona casent0102648 profile 1.jpg
  • Apicoscrobal hair absent, if a hair present in this position it is similar in form to hairs that precede or follow it on the dorsolateral margin of the head . . . . . 176

176

return to couplet #175

  • With head in profile the occipital margin with a transverse row of 4 stiff simple hairs that are much longer and more erect than the preceding ground-pilosity. Alitrunk in profile with propodeal teeth elevated, not continuing the line of the dorsal outline of the propodeum. (Malaysia (West Malaysia, Sarawak, Sabah), Singapore, Brunei, Indonesia (Kalimantan, Sumatra)) . . . . . Strumigenys rofocala
Strumigenys rofocala casent0102622 profile 1.jpg
  • With head in profile the occipital margin without stiff simple hairs that are much longer and more erect than the preceding ground-pilosity. Alitrunk in profile with propodeal teeth depressed and evenly continuing the line of the dorsal outline of the propodeum. (Philippines, Hawaii) . . . . . Strumigenys uichancoi

177

return to couplet #172

  • Inner margin of mandible with a translucent cuticular lamella that extends from the base almost to the preapical tooth; maximum width of lamella about one-third the width of the mandible. (Thailand, Malaysia (West Malaysia, Sarawak, Sabah), Brunei, Singapore, Indonesia (Kalimantan, Sumatra, Java, Bali, Lombok), Philippines (Palawan, Luzon)) . . . . . Strumigenys signeae
Strumigenys signeae casent0217957 p 1 high.jpg
  • Inner margin of mandible without a translucent cuticular lamella that extends from base to vicinity of preapical tooth . . . . . 178

178

return to couplet #177

  • With head in full-face view outer margins of fully closed mandibles deeply concave from close to base almost to level of preapical tooth. (Indonesia (Sumatra)) . . . . . Strumigenys ahares
Strumigenys ahares casent0102663 p 1 high.jpg
  • With head in full-face view outer margins of fully closed mandibles convex from close to base almost to level of preapical tooth . . . . . 179

179

return to couplet #178

  • Metapleuron and side of propodeum mostly to entirely smooth . . . . . 180
  • Metapleuron and side of propodeum mostly to entirely reticulate or reticulate-punctate . . . . . 182

180

return to couplet #179

  • With petiole in profile dorsal margin of lateral spongiform lobe located high on side and extends the whole length of the node, terminating at or very close to the anterodorsal angle of the node. With head in profile the dorsum with a pair of erect short hairs just in front of highest point of vertex. Apical fork of mandible with an intercalary tooth and 2-3 intercalary denticles between apicodorsal and apicoventral teeth. (India, Bhutan) . . . . . Strumigenys virgila
Strumigenys virgila casent0900829 p 1 high.jpg
  • With petiole in profile dorsal margin of lateral spongiform lobe located low on side and restricted to posterior half of node, terminating far behind and below the anterodorsal angle of the node. With head in profile the dorsum without erect hairs in front of highest point of vertex. Apical fork of mandible with 1-2 intercalary denticles between apicodorsal and apicoventral teeth . . . . . 181

181

return to couplet #180

  • With head in full-face view dorsolateral margin from apex of scrobe to occipital corner with a row of 4 or more freely laterally projecting stiff hairs. Upper surface of hind femur with a spaced row of 3-4 stiff straight hairs that are inclined upward at about 45°. Pronotal dorsum with a pair of short erect hairs located medially at extreme anterior margin. Mandibles and scape relatively long, MI 47-50, SI 83-88. (Indonesia (Sumatra)) . . . . . Strumigenys valefor
Strumigenys valefor casent0102664 profile 1.jpg
  • With head in full-face view dorsolateral margin from apex of scrobe to occipital corner with a single freely laterally projecting stiff hair, in apicoscrobal position. Upper surface of hind femur without stiff straight hairs that are inclined upward at about 45°. Pronotal dorsum without short erect hairs located medially at extreme anterior margin. Mandibles and scape relatively short, MI 35-39, SI 62-69. (Thailand, Malaysia (West Malaysia, Sarawak), Indonesia (Sumatra, Kalimantan)) . . . . . Strumigenys sublaminata
Strumigenys sublaminata casent0280744 p 1 high.jpg

182

return to couplet #179 Dorsum of pronotum without standing hairs apart from the humeral pair. Pronotal humeral hair and erect pair on mesonotum flattened to remiform. Petiole node in dorsal view broader than long. Scape shorter, SI 73. (Indonesia (Java)) . . . . . Strumigenys gamegyn

Strumigenys gamegyn casent0900831 p 1 high.jpg
  • Dorsum of pronotum with 1-2 pairs of standing hairs as well as the humeral pair. Pronotal humeral hair and erect pair on mesonotum simple. Petiole node in dorsal view slightly longer than broad. Scape longer, SI 86. (Malaysia (Sarawak)) . . . . . Strumigenys halpas
Strumigenys halpas casent0102657 profile 1.jpg

183

return to couplet #155

  • Bullae of femoral glands enormous on middle and hind legs; on dorsal surface of hind femur the bulla pale in colour and very conspicuous, occupying the distal third to half the length of the segment and about half of its maximum width . . . . . 184
  • Bullae of femoral glands small or invisible on middle and hind legs; on dorsal surface of hind femur the bulla at maximum a small pale oval patch near apex of segment, frequently indistinct and sometimes not discernible . . . . . 186

184

return to couplet #183

  • Bulla of femoral gland well developed on dorsum of front leg, in proportion with size of bullae on middle and hind femora . . . . . 185
  • Bulla of femoral gland absent from dorsum of front leg, contrasting with the strongly developed bullae on the middle and hind femora. (Malaysia (Sarawak), Brunei) . . . . . Strumigenys amasara
Strumigenys amasara casent0102630 profile 1.jpg

185

return to couplet #184

  • Mandible with a minute preapical denticle, at least on the right mandible. With head in full-face view upper scrobe margins diverge posteriorly from frontal lobes then abruptly flare outward at level of eyes at about 90° from their previous paths. Head broader and scape shorter, CI 90, SI 57. (Malaysia (Sarawak, Sabah)) . . . . . Strumigenys seynoka
Strumigenys seynoka casent0900869 p 1 high.jpg
  • Mandible with a small but stoutly conical preapical tooth. With head in full-face view upper scrobe margins continuous and evenly convex from frontal lobes to apices of scrobes, not abruptly flared outward at level of eye. Head narrower and scape longer, CI 81-82, SI 63-65. (Malaysia (Sabah)) . . . . . Strumigenys baladria
Strumigenys baladria casent0102635 profile 1.jpg

186

return to couplet #183

  • With head in full-face view upper scrobe margin very irregular, with a deep indentation or excavation above the level of the eye, the posterior margin of which is transverse or nearly so . . . . . 187
  • With head in full-face view upper scrobe margin regular, either more or less straight, evenly convex or shallowly sinuate; may be jagged but without a deep indentation or excavation above the level of the eye and without a transverse section to the margin . . . . . 191

187

return to couplet #186

  • Mesopleuron, metapleuron and side of propodeum mostly unsculptured. Propodeal declivity with a lamella present. Mandible with a preapical denticle. With head in profile scrobe well defined behind level of eye, with a sharply defined dorsal margin. (Malaysia (West Malaysia, Sarawak, Sabah), Brunei, Indonesia (Sumatra, Java, Bali, Lombok), Philippines (Palawan, Luzon)) . . . . . Strumigenys koningsbergeri
Strumigenys koningsbergeri casent0217953 p 1 high.jpg
  • Mesopleuron, metapleuron and side of propodeum mostly to entirely reticulate or reticulate-punctate. Propodeal declivity without a lamella, at most with a fine carina. Mandible with a short stout preapical tooth. With head in profile scrobe vestigial to absent behind level of eye, with its dorsal margin bluntly rounded or scarcely defined . . . . . 188

188

return to couplet #187

  • Disc of postpetiole finely and densely reticulate-punctate over most or all of its dorsum; body colour never universally blackish brown. Basigastral costulae at least as long as disc of postpetiole, usually longer . . . . . 189
  • Disc of postpetiole smooth and shining over most or all of its dorsum, or body colour universally blackish brown, or both. Basigastral costulae much shorter than disc of postpetiole, usually only about half its length . . . . . 190

189

return to couplet #188

  • Process that projects from side of head below and just behind level of antennal insertion thorn-like, sharply triangular and with the acute apex directed anterolaterally in full-face view. Monomorphic species with slight size-variation. (Papua New Guinea) . . . . . Strumigenys festigona
Strumigenys festigona casent0900866 p 1 high.jpg
  • Process that projects from side of head below and just behind level of antennal insertion conical or bluntly rounded, if conical then not thorn-like nor acute and its apex directed laterally in full-face view. Polymorphic species with extreme size-variation. (Indonesia (Aru, Salawati, Batanta, Irian Jaya), Papua New Guinea) . . . . . Strumigenys loriae
Strumigenys loriae castype06953-01 profile 1.jpg

190

return to couplet #188

  • Head, alitrunk and waist segments yellow, gaster a strongly contrasting dark brown. Pronotum with a pair of standing hairs in addition to the humeral hairs, located near anterodorsal margin. Preapical tooth on mandible stoutly conical and weakly recurved. Inner margin of mandible in full-face view with an abruptly truncated short straight inflected surface just proximal of the preapical tooth, a U-shaped or V-shaped gap present between this surface and proximal face of the preapical tooth. (Papua New Guinea) . . . . . Strumigenys kyroma
Strumigenys kyroma casent0900863 p 1 high.jpg
  • Head, alitrunk, waist segments and gaster uniformly dark brown to blackish brown. Pronotum without standing hairs except for the humeral hairs. Preapical tooth on mandible short and blunt, inclined toward the apicodorsal tooth. Inner margin of mandible in full-face view meeting proximal base of preapical tooth through a short shallow curve, at most a weak impression separating them. (Papua New Guinea) . . . . . Strumigenys retothra
Strumigenys retothra casent0900861 p 1 high.jpg

191

return to couplet #186

  • Apical antennal segment constricted or attenuated basally and forming a narrow peduncle or neck before its articulation with preapical segment . . . . . 192
  • Apical antennal segment not constricted or attenuated basally, broadly articulating with preapical segment . . . . . 195

192

return to couplet #191

  • Head broad and scape short, CI 80, SI 68. Mandible stout, with a very small preapical denticle; inner margins at full closure almost touching immediately proximal of the preapical denticle. Ventrolateral margin of head deeply and extensively concave in front of eye. Petiole node in dorsal view distinctly broader than long. (Indonesia (Sulawesi)) . . . . . Strumigenys pallentra
Strumigenys pallentra casent0900860 p 1 high.jpg
  • Head narrow and scape long, CI 59-72, SI 72 - > 100. Mandible slender, with a small triangular preapical tooth; inner margins at full closure widely separated immediately proximal of the preapical tooth. Ventrolateral margin of head not concave in front of eye. Petiole node in dorsal view as long as or longer than broad . . . . . 193

193

return to couplet #192

  • Disc of postpetiole enormously swollen, in dorsal view its maximum diameter (discounting spongiform tissue) about 0.70 X HW, more than 0.75 X maximum width of first gastral tergite. Base of first gastral sternite naked, without trace of spongiform tissue or pad of compressed hairs. Basigastral costulae oblique, converging toward midline posteriorly. (Fiji Is) . . . . . Strumigenys tumida
Strumigenys tumida casent0186506 p 1 high.jpg
  • Disc of postpetiole small, in dorsal view its maximum diameter (discounting spongiform tissue) about 0.35 X HW, less than 0.50 X maximum width of first gastral tergite. Base of first gastral sternite with weak spongiform tissue or a pad of compressed hairs. Basigastral costulae straight, roughly parallel with midline . . . . . 194

194

return to couplet #193

  • With head in full-face view the upper scrobe margin with 3 laterally projecting long fine hairs: one above the eye, one posterior to this and the third in apicoscrobal position. Cephalic dorsum with at least one pair of erect fine hairs near occipital margin; pronotal dorsum anteriorly with a similar pair. Smaller species with broader head and shorter scape, HL 0.70-0.76, CI 70-73, SI 71-75. (Malaysia (Sabah)) . . . . . Strumigenys tadynastes
Strumigenys tadynastes casent0102573 profile 1.jpg
  • With head in full-face view the upper scrobe margin without laterally projecting long fine hairs. Cephalic dorsum and pronotal dorsum anteriorly without erect hairs. Larger species with narrower head and longer scape, HL 1.06, CI 64, SI 85. (Malaysia (Sabah)) . . . . . Strumigenys tomodonta
Strumigenys tomodonta casent0102561 profile 1.jpg

195

return to couplet #191

  • Preapical dentition of mandible a single small to well developed conical tooth that is directed medially, its axis at a right-angle or near right-angle to the long axis of the . . . . . 196
  • Preapical dentition of mandible a single oblique denticle or very small oblique triangular prominence near apex of inner margin; axis of preapical denticle strongly inclined anteriorly or anteromedially, not at a right-angle to the long axis of the mandible . . . . . 213

196

return to couplet #195

  • Disc of postpetiole mostly to entirely sculptured; either densely punctate or reticulate-punctate, or also with scattered fine longitudinal costulae; at most the sculpture partially effaced in the mid-dorsal area of the disc . . . . . 197
  • Disc of postpetiole mostly to entirely smooth and shining; at most with traces of faint punctulate sculpture around the periphery of the disc. . . . . . 201

197

return to couplet #196

  • Inner margin of mandible with a convex lamella that commences near the base and terminates abruptly just proximal of the preapical tooth. (Indonesia (Sumatra)) . . . . . Strumigenys sardella
Strumigenys sardella casent0102658 profile 1.jpg
  • Inner margin of mandible straight to feebly convex, without a convex lamella that terminates abruptly just proximal of the preapical tooth . . . . . 198

198

return to couplet #197

  • Apicoscrobal hair absent. Cephalic dorsum without erect hairs in front of those at the occipital margin. Dorsum of pronotum without erect simple hairs . . . . . 199
  • Apicoscrobal hair present. Cephalic dorsum with erect hairs in front of those at the occipital margin. Dorsum of pronotum with erect simple hairs, at least a pair anterodorsally between the humeral hairs . . . . . 200

199

return to couplet #198

  • Pronotal humeral hair conspicuously flagellate. Mesonotum with a pair of narrowly remiform erect hairs. Katepisternum with an unsculptured smooth patch. Basigastral costulae considerably longer than disc of postpetiole. Erect hairs on first gastral tergite restricted to a basal and an apical transverse row. CI 76, MI 43, SI 67. (Indonesia (Sumba)) . . . . . Strumigenys rectidens
  • Pronotal humeral hair stiff and simple. Mesonotum without erect hairs. Katepisternum entirely coarsely reticulate-punctate. Basigastral costulae shorter than disc of postpetiole. Erect hairs on first gastral tergite sparse but not restricted to a basal and an apical transverse row. CI 81, MI 37, SI 64. (Papua New Guinea) . . . . . Strumigenys monoropa

200

return to couplet #198

  • Length of preapical mandibular tooth in full-face view less than the width of the mandible at the site of the tooth. Metanotal groove shallow. (Malaysia (West Malaysia), Indonesia (Sumatra, Java, Bali)) . . . . . Strumigenys ebbae
Strumigenys ebbae casent0280755 p 1 high.jpg
  • Length of preapical mandibular tooth in full-face view equal to the width of the mandible at the site of the tooth. Metanotal groove broad and deeply impressed. (Malaysia (West Malaysia)) . . . . . Strumigenys disturba
Strumigenys disturba casent0102644 profile 1.jpg

201

return to couplet #196

  • Hairs on leading edge of scape, and hairs that project from edge of upper scrobe margin in full-face view, short and broad, very broadly spatulate or spoon-shaped. (Malaysia (Sarawak)) . . . . . Strumigenys naberia
Strumigenys naberia casent0900883 p 1 high.jpg
  • Hairs on leading edge of scape, and hairs that project from edge of upper scrobe margin in full-face view, fine and simple or at most very slightly flattened, linear-spatulate and curved . . . . . 202

202

return to couplet #201

  • With petiole in profile the ventral spongiform curtain is paralleled on the side by a second longitudinal spongiform strip that extends from about the midlength of the peduncle to about the mid length of the node. (Malaysia (West Malaysia), Indonesia (Sumatra)) . . . . . Strumigenys menueta
Strumigenys menueta casent0102674 profile 1.jpg
  • With petiole in profile the ventral spongiform curtain not paralleled on the side by a second longitudinal spongiform strip . . . . . 203

203

return to couplet #202

  • Hairs on leading edge of scape long and only feebly curved, some of them longer than maximum width of scape. Scape strongly dorsoventrally flattened and very broad, the leading edge strongly convex. (Malaysia (West Malaysia), Singapore, Indonesia (Sumatra)) . . . . . Strumigenys roganas
Strumigenys roganas casent0900885 p 1 high.jpg
  • Hairs on leading edge of scape short, strongly curved toward apex of scape, none of them longer than maximum width of scape. Scape weakly or not dorsoventrally flattened, not strikingly broad, the leading edge only moderately convex . . . . . 204

204

return to couplet #203

  • Inner margin of mandible with a projecting cuticular lamella present, its border straight or convex; mandible obviously with more than just a reinforced sharp edge on dorsal rim of its inner margin . . . . . 205
  • Inner margin of mandible with a reinforced sharp edge on dorsal rim that may be coloured or sculptured differently to remainder of mandibular dorsum, but without a projecting cuticular lamella . . . . . 207

205

return to couplet #204

  • Outer margin of mandible shallowly concave through the middle third of its length; proximal and distal thirds shallowly convex so that mandible appears decidedly sinuate. Distance between base of apicodorsal tooth and preapical tooth greater than length of preapical tooth. Dorsum of petiole node not densely reticulate-punctate, hardly more sculptured than disc of postpetiole. (Malaysia (Sarawak)) . . . . . Strumigenys ulteria
Strumigenys ulteria casent0102566 profile 1.jpg
  • Outer margin of mandible straight to shallowly convex from base to level of preapical tooth, not appearing sinuate. Distance between base of apicodorsal tooth and preapical tooth equal to or less than length of preapical tooth. Dorsum of petiole node densely reticulate-punctate, much more strongly sculptured than disc of postpetiole . . . . . 206

206

return to couplet #206

  • Length of preapical tooth about half width of mandible at point where tooth arises. Lamella on inner margin of mandible straight-edged, narrowest at base and evenly gradually increasing in width to its termination just proximal of preapical tooth. Pronotal dorsum with a single pair of short stiff standing hairs as well as the humeral pair. (Malaysia (Sarawak, Sabah)) . . . . . Strumigenys kapryx
Strumigenys kapryx casent0900887 p 1 high.jpg
  • Length of preapical tooth greater than width of mandible at point where tooth arises. Lamella on inner margin of mandible convex-edged, narrow at base, broadening medially and narrowing again distally to its termination just proximal of preapical tooth. Pronotal dorsum with two pairs of short stiff standing hairs as well as the humeral pair. (Malaysia (West Malaysia)) . . . . . Strumigenys synchysis
Strumigenys synchysis casent0900892 p 1 high.jpg

207

return to couplet #204

  • Ventrolateral margin of head immediately in front of eye distinctly constricted or narrowed, or conspicuously concave . . . . . 208
  • Ventrolateral margin of head immediately in front of eye not distinctly constricted or narrowed, nor conspicuously concave . . . . . 212

208

return to couplet #207

  • Pronotal dorsum with a single pair of short stiff standing hairs, located anteriorly between the humeral pair; mesonotum with a single similar pair; with head in profile dorsum with a single pair of short standing hairs apart from those that fringe the lateral and occipital margins . . . . . 209
  • Either pronotal dorsum with two or more pairs of short stiff standing hairs as well as the humeral pair, or mesonotum with 2-3 pairs, or dorsum of head in profile with several pairs of short standing hairs apart from those that fringe the lateral and occipital margins, or with two or all of these . . . . . 211

209

return to couplet #208

  • With head in full-face view the upper scrobe margins strikingly jagged; each curved hair on margin arises from the apex of a sharply defined low broad triangular peak, the margin between each peak conspicuously concave. (Malaysia (Sarawak)) . . . . . Strumigenys vindala
Strumigenys vindala casent0102567 profile 1.jpg
  • With head in full-face view the upper scrobe margins almost smooth, definitely not jagged; curved hairs on margin not arising from the apices of a series of sharply defined low broad triangular peaks . . . . . 210

210

return to couplet #210

  • Preapical tooth of mandible set very close to apicodorsal tooth. Smaller species with shorter mandibles and scapes, HL 0.60-0.61, MI 38-40, SI 59-63. Metapleuron and side of propodeum mostly to entirely smooth. (Thailand) . . . . . Strumigenys adiastola
Strumigenys adiastola casent0102627 p 1 high.jpg
  • Preapical tooth of mandible set a considerably distance proximal of apicodorsal tooth. Larger species with longer mandibles and scapes, HL 0.76-0. 80, MI 48-50, SI 72-75. Metapleuron and side of propodeum finely reticulate to reticulate-punctate. (Indonesia (Sumatra)) . . . . . Strumigenys babelina
Strumigenys babelina casent0102675 profile 1.jpg

211

return to couplet #208

  • Larger species, HL 0.75-0.76, HW 0.62-0.63. Dorsum of head with posteriorly divergent fine longitudinal rugulae on vertex. (Indonesia (Sumatra)) . . . . . Strumigenys incomposita
Strumigenys incomposita casent0102673 profile 1.jpg
  • Smaller species, HL 0.61-0.66, HW 0.50-0.54. Dorsum of head reticulate-punctate on vertex. (Indonesia (Sumatra, Java, Bali)) . . . . . Strumigenys kakothema
Strumigenys kakothema casent0102678 profile 1.jpg

212

return to couplet #207

  • Scape shorter and head broader, SI 61-62, CI 82-84. (Malaysia (West Malaysia)) . . . . . Strumigenys conturba
Strumigenys conturba casent0102639 profile 1.jpg
  • Scape longer and head narrower, SI 66-72, CI 76-80. (Malaysia (West Malaysia), Indonesia (Sumatra, Java, Bali)) . . . . . Strumigenys ebbae
Strumigenys ebbae casent0280755 p 1 high.jpg

213

return to couplet #195

  • Bulla of femoral gland clearly visible on middle and hind legs, represented by at least a small pale oval patch proximal of the dorsal femoral apex; usually small but sometimes very conspicuous . . . . . 214
  • Bulla of femoral gland not visible on middle and hind legs . . . . . 215

214

return to couplet #213

  • Pronotal humeral hair very short and stubby, no longer than hairs that project from lateral margin of occipital lobe. Hind tibia without apicotibial gland bulla. Pair of standing hairs on mesonotum minute, scarcely longer stouter and more erect than the sparse ground-pilosity. (Malaysia (Sabah)) . . . . . Strumigenys perturba
Strumigenys perturba casent0102624 profile 1.jpg
  • Pronotal humeral hair long stiff and straight, longer than hairs that project from lateral margin of occipital lobe. Hind tibia with apicotibial gland bulla present on posterior surface. Pair of standing hairs on mesonotum distinct, obviously longer stouter and more erect than the sparse ground-pilosity. (Malaysia (Sarawak)) . . . . . Strumigenys ignota
Strumigenys ignota casent0102610 profile 1.jpg

215

return to couplet #213

  • With alitrunk in profile the pronotal dorsum anteriorly with a pair of short erect simple hairs, between and anterior to the humeral pair . . . . . 216
  • With alitrunk in profile the pronotal dorsum without erect simple hairs except for the humeral pair . . . . . 221

216

return to couplet #215

  • Hairs on first gastral tergite all simple and shallowly curved, usually acute apically but less commonly some may be blunt; hairs never linear-spatulate nor flattened and expanded toward the apex . . . . . 217
  • Hairs on first gastral tergite not all simple, some to all either linear-spatulate or flattened and expanded toward the apex . . . . . 219

217

return to couplet #216

  • Metapleuron and side of propodeum entirely densely reticulate-punctate. (Malaysia (Sarawak)) . . . . . Strumigenys chorosa
Strumigenys chorosa casent0900876 p 1 high.jpg
  • Metapleuron and side of propodeum mostly to entirely smooth; if some punctures present they are posterior or minute and distinctly separated, not reticulate-punctate . . . . . 218

218

return to couplet #217

  • With head in full-face view the dorsolateral margins evenly and regularly divergent from frontal lobes to apices of scrobes; in this view eyes not visible or at most only the extreme outermost segment of their arc can be seen. Larger species with narrower head, HL 0.86-0.90, HW 0.68-0.72, CI 78-82. (Indonesia (Sumatra)) . . . . . Strumigenys ataxia
Strumigenys ataxia casent0102677 profile 1.jpg
  • With head in full-face view the dorsolateral margins more strongly divergent from level of eyes to apices of scrobes than from frontal lobes to eye; in this view eyes mostly to entirely visible. Smaller species with broader head, HL 0.64-0.76, HW 0.56-0.65, CI 84-88. (Thailand, Malaysia (West Malaysia), Indonesia (Sumatra)) . . . . . Strumigenys amnesia
Strumigenys amnesia casent0102631 profile 1.jpg

219

return to couplet #216

  • Lamella on propodeal declivity very narrow, its maximum width less than the length of the propodeal tooth; posterior (free) margin of lamella concave. Larger species, HL 0.79-0.86, SL 0.40-0.48 . . . . . 220
  • Lamella on propodeal declivity broad, its maximum width at least equal to the length of the propodeal tooth; posterior (free) margin of lamella convex below level of spiracle. Smaller species, HL 0.68-0.70, SL 0.33-0.34. (Malaysia (West Malaysia)) . . . . . Strumigenys nergala
Strumigenys nergala casent0102572 profile 1.jpg

220

return to couplet #219

  • Scape and mandibles shorter, head somewhat broader, SI 57-60, MI 42-44, CI 85-87. With head in full-face view upper scrobe margin above eye is shallowly concave. (Malaysia (Sabah)) . . . . . Strumigenys taraxis
Strumigenys taraxis casent0102562 profile 1.jpg
  • Scape and mandibles longer, head somewhat narrower, SI 67-71, MI 48-50, CI 80-83. With head in full-face view upper scrobe margin above eye is shallowly convex. (Indonesia (Sumatra)) . . . . . Strumigenys hyletha
Strumigenys hyletha casent0102676 profile 1.jpg

221

return to couplet #215

  • With propodeum in profile the declivity below the tooth merely with a narrow cuticular crest whose posterior (free) margin closely parallels the shape of the margin of the declivity. Larger species, HL 0.82-0.96, HW 0.70-0.82. (Malaysia (Sabah)) . . . . . Strumigenys blanda
Strumigenys blanda casent0900873 p 1 high.jpg
  • With propodeum in profile the declivity below the tooth with a distinct lamella whose posterior (free) margin does not parallel the shape of the margin of the declivity. Smaller species, HL 0.64-0.76, HW 0.54-0.66 . . . . . 222

222

return to couplet #221

  • Metapleuron and side of propodeum entirely reticulate to reticulate-punctate. Scape longer and head somewhat narrower, SI 65-69, CI 82-83. (Malaysia (Sarawak)) . . . . . Strumigenys vertigosa
Strumigenys vertigosa casent0900875 p 1 high.jpg
  • Metapleuron and side of propodeum mostly to entirely un sculptured and smooth. Scape shorter and head somewhat broader, SI 53-60, CI 84-89. (Thailand, Malaysia (West Malaysia, Sarawak), Indonesia (Sulawesi)) . . . . . Strumigenys strygax
Strumigenys strygax casent0900874 p 1 high.jpg