Pogonomyrmex californicus

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Pogonomyrmex californicus
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Myrmicinae
Tribe: Pogonomyrmecini
Genus: Pogonomyrmex
Species group: californicus
Species: P. californicus
Binomial name
Pogonomyrmex californicus
(Buckley, 1867)

Pogonomyrmex californicus casent0102895 profile 1.jpg

Pogonomyrmex californicus casent0102895 dorsal 1.jpg

Specimen Label


Common Name
California Harvester Ant
Language: English

The nest of Pogonomyrmex californicus is surmounted by a circular or semicircular crater of loose sand bearing a single entrance.

At a Glance • Facultatively polygynous  


Cole (1968) - Identification of workers of the "typical" Pogonomyrmex californicus has apparently presented no problems. Such workers are those which comprise that part of the over-all population chiefly in coastal California and Baja California. They are of comparatively small stature and bear coarse cephalic and thoracic rugae, the interspaces of which are strongly shining and faintly or not at all punctate. The petiolar node is short and rather broad, and it has a prominent nipple and a steep anterior declivity. The body is a concolorous, rather light, ferrugineous red.

With eastward progression in the range of californicus, however, the following clinal transitions and tendencies can be noted in the worker caste: (1) decrease in number, spacing, and coarseness of cephalic rugae; (2) addition of interrugal punctures on the head and pronotal humeri; (3) decrease in gradient of the anterior declivity of the petiolar node; (4) development of a more spatulate petiolar node, the sides becoming more convex; (5) reduction of the petiolar nipple; (6) tendency toward the development of a ventral petiolar peduncular process; (7) lengthening of both petiolar and postpetiolar nodes; (8) reduction in size of the postpetiolar ventral process; (9) increase in over-all size; and (10) infuscation of the gaster in some or all of a series, from lateral spotting to concolorous black or brown.

Keys including this Species


United States: Western Texas, southern New Mexico, southern Utah, Arizona, western Nevada, southern California. Mexico: Baja California, Sonora, Chihuahua.

Latitudinal Distribution Pattern

Latitudinal Range: 41.257609° to 19.134331°.

Tropical South

Distribution based on Regional Taxon Lists

Nearctic Region: United States (type locality).
Neotropical Region: Mexico.

Distribution based on AntMaps


Distribution based on AntWeb specimens

Check data from AntWeb

Countries Occupied

Number of countries occupied by this species based on AntWiki Regional Taxon Lists. In general, fewer countries occupied indicates a narrower range, while more countries indicates a more widespread species.


Nearly all arid environments ranging from weedy bajadas to grasslands on to creosotebush scrub.


Can be locally abundant; common in northern Mexico.


Typically nests in sandy soils where it has small mounds (20 cm diameter). This species does not clear vegetation surrounding the nest. Nest populations are about 2000 individuals, with a nest depth of 2 meters. It is primarily a seed harvester. Foragers are often active during relatively hot times of the day, during which the ants run stiff-legged with the gaster elevated, apparently in an attempt to distance themselves from the hot surface. They can often be seen mounting small pebbles and stones and waving their legs, apparently attempting to lower their body temperatures. It is very pugnacious and is one of the two ants in New Mexico with the most painful sting (the other species is Pogonomyrmex maricopa). The sting is barbed and becomes detached to remain in the flesh, as occurs in the honeybee. It is possible to watch the sting apparatus apparently pump venom into one’s tissues, especially through a microscope. Reproductives are found in nests from May to July. Flights occur from May to July and a single nest may participate in several nuptial flights. Horned lizards (Phrynosoma spp.) are major predators. (Mackay and Mackay 2002)

The workers are assiduous harvesters; they forage all day, except during the hottest hours. Seeds are harvested in great numbers, notably those of Phacelia spp., Aristida sp., and Sarcobatus vermiculatus; the mounds are often surrounded by the bracts of these and other seeds (Cole, 1932b: 115).

In Nevada, Wheeler and Wheeler (1986): This red or red and black harvester is one of the common ants of the Mojave and Sonoran deserts. We have found chambers at a depth of 2 l/2 cm under an area of 30-60 cm2; these usually contained seeds or chaff. In a flourishing colony we found brood, seeds, and sexual forms in the same chamber, with the brood lying on the seeds. We also found stored seeds at a depth of 7 l/2 cm. The workers ran rapidly and erratically, with frequent stops and changes of direction for no apparent reason. Often the gaster was conspicuously elevated; this doubtless had a cooling function. The nest was closed with sand or pebbles at night and in the heat of the day. We have a total of 261 records from 175 localities; 500-6,300 ft.: 28 from the Hot Desert, 83 from the Cool Desert (45 from Sarcobatus Subclimax, 2 from cottonwood groves, 17 from disturbed areas, and 13 from sand dunes). In Nevada P. califomicus is common and widely distributed in the southern and western portions of the state. We have no records from a zone 40 mi. wide along the entire northern border and no records from Elko, White Pine, and Lander counties. We found the following myrmecophilous beetles in the nests: Araeoschizus armatus; Araeoschisuz armatus and Notibus nr puncticollis LeC; Notibus puberulus LeC; Notibus substriatus Casey; Papusus sp. probably macer Casey.

Flight Period

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Source: antkeeping.info.

Life History Traits

  • Mean colony size: 4,500 (Holldobler & Wilson, 1970; Erickson, 1972; Beckers et al., 1989)
  • Foraging behaviour: mass recruiter (Holldobler & Wilson, 1970; Erickson, 1972; Beckers et al., 1989)



Mcz-ent00668688 Pogonomyrmex californicus hef.jpgMcz-ent00668688 Pogonomyrmex californicus hal.jpgMcz-ent00668688 Pogonomyrmex californicus had.jpgMcz-ent00668688 Pogonomyrmex californicus lbs.JPG
Worker. . Owned by Museum of Comparative Zoology.

Images from AntWeb

Pogonomyrmex californicus casent0102895 head 1.jpgPogonomyrmex californicus casent0102895 profile 1.jpgPogonomyrmex californicus casent0102895 dorsal 1.jpgPogonomyrmex californicus casent0102895 label 1.jpg
Worker. Specimen code casent0102895. Photographer Jen Fogarty, uploaded by California Academy of Sciences. Owned by CAS, San Francisco, CA, USA.
Pogonomyrmex californicus casent0005710 head 1.jpgPogonomyrmex californicus casent0005710 profile 1.jpgPogonomyrmex californicus casent0005710 dorsal 1.jpgPogonomyrmex californicus casent0005710 label 1.jpg
Worker. Specimen code casent0005710. Photographer April Nobile, uploaded by California Academy of Sciences. Owned by UCDC, Davis, CA, USA.
Pogonomyrmex californicus castype00626 head 1.jpgPogonomyrmex californicus castype00626 profile 1.jpgPogonomyrmex californicus castype00626 dorsal 1.jpgPogonomyrmex californicus castype00626 label 1.jpg
Syntype of Pogonomyrmex badius estebaniusWorker. Specimen code castype00626. Photographer April Nobile, uploaded by California Academy of Sciences. Owned by CAS, San Francisco, CA, USA.


Images from AntWeb

Pogonomyrmex californicus castype00625 head 1.jpgPogonomyrmex californicus castype00625 profile 1.jpgPogonomyrmex californicus castype00625 dorsal 1.jpgPogonomyrmex californicus castype00625 label 1.jpg
Lectotype of Pogonomyrmex badius estebaniusQueen (alate/dealate). Specimen code castype00625. Photographer April Nobile, uploaded by California Academy of Sciences. Owned by CAS, San Francisco, CA, USA.


The following information is derived from Barry Bolton's Online Catalogue of the Ants of the World.

  • californicus. Myrmica californica Buckley, 1867: 336 (w.) U.S.A. Wheeler, W.M. 1914e: 153 (q.m.); Taber, Cokendolpher & Francke, 1988: 51 (k.). Combination in Pogonomyrmex: Emery, 1895c: 311. Senior synonym of estebanius, longinodis, nitratus: Cole, 1968: 120; of hindleyi: Snelling, R.R. 1982a: 98. See also: Tulloch, 1930: 61.
  • estebanius. Pogonomyrmex badius subsp. estebanius Pergande, 1893: 33 (w.q.) MEXICO. Wheeler, W.M. 1914e: 154 (m.). Subspecies of californicus: Emery, 1895c: 311; Wheeler, W.M. 1902c: 391. Junior synonym of californicus: Cole, 1968: 120.
  • longinodis. Pogonomyrmex californicus subsp. longinodis Emery, 1895c: 311 (w.) U.S.A. Raised to species: Creighton, 1950a: 126. Junior synonym of californicus: Cole, 1968: 120.
  • hindleyi. Pogonomyrmex californius var. hindleyi Forel, 1914d: 270 (w.) U.S.A. Raised to species: Creighton, 1950a: 125. Junior synonym of californicus: Snelling, R.R. 1982a: 98.
  • nitratus. Pogonomyrmex californicus subsp. nitratus Cook, 1953: 99, fig. (w.) U.S.A. Junior synonym of californicus: Cole, 1968: 121.

Unless otherwise noted the text for the remainder of this section is reported from the publication that includes the original description.



Cole (1968) - HL 1.43-1.92 mm, HW 1.39-1.99 mm, CI 92.8-103.6, SL 1.10-1.53 mm, SI 69.9-97.4, EL 0.27-0.46 mm, EW 0.22-0.34 mm, OI 18.2-24.0, WL 1.20-2.57 mm, PNL 0.31-0.63 mm, PNW 0.34-0.56 mm, PPL 0.34-0.56 mm, PPW 0.42-0.75 mm.

Mandible as illustrated in Pl. III, Fig. 9. Base of antennal scape as shown in Pl. IV. Fig. 9; contour of thorax, petiole, and postpetiole, in lateral view, as in Pl. VI, Fig. 8.

Cephalic sculpture varying from a few, coarse, widely spaced rugae with or without sparse interrugal punctures to notably more abundant, more closely spaced rugae and dense, fine, interrugal punctures. Interrugal spaces of head and thorax distinctly shining. Interrugal spaces of thorax, except sides of epinotum, with or without punctures; those of sides of epinotum without punctures. Epinotum unarmed, the angle between the epinotal base and declivity generally smooth and broadly rounded but sometimes rather sharp. Contour of petiolar and postpetiolar nodes, in dorsal view, as shown in Pl. VII, Figs. 12, 13. Petiolar and postpetiolar nodes with or without irregular rugae or striae.

Color variable as follows: concolorous light or medium ferrugineous red; concolorous ferrugineous red except gaster which bears lateral blotches of black or a black apical portion; head and thorax ferrugineous red, petiole and postpetiole red or brown, and gaster brown or black.


Cole (1968) - HL 1.53-1.80 mm, HW 1.48-1.84 mm, CI 94.8-102.2, 5L 1.11-1.22 mm, SI 66.3-75.0, EL 0.34-0.43 mm, EW 0.24-0.29 mm, OI 20.9-23.9, WL 2.19-2.36 mm, PNL 0.39-0.18 mm, PNW 0.43-0.51 mm, PPL 0.44-0.53 mm, PPW 0.65-0.78 mm.

With the usual female characters and those of the worker, except interrugal spaces of head very smooth and shining and without any definite interrugal sculpture.


Cole (1968) - HL 1.19-l.48 mm, HW 1.36-1.60 mm, CI 105.1-114.3, SL 0.66-0.73 mm SI 45.6-52.2, EL 0.48-0.56 mm, EW 0.29-0.36 mm, OI 37.5-42.9, WL 2.35-249 mm, PNL 0.36-0.44 mm, PNW 0.53-0.70 mm, PPL 0.51-0.70 mm, PPW 0.77-0.97 mm.

Head with a distinct, though sometimes weak, median longitudinal carinula across the occiput and vertex; mandible as shown in Pl. VIII, Fig. 8, blade moderately bent, bearing 2 to 4 (usually 2 or 3) teeth on a narrow, transverse, generally somewhat constricted, apical margin. Anterior declivity of pronotum, in lateral view, meeting the short pronotal collar at an abrupt angle. Epinotum without armature. Petiolar node, viewed from above, approximately as broad as long, the sides broadly convex. Sculpture of body not definitive. Paramere as shown in Pl. X, Fig. 7 and Pl. XI, Fig 7.

Syntype Specimen Labels


  • 2n = 32 (USA) (Taber et al., 1988) (as P. estebanius).


References based on Global Ant Biodiversity Informatics

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