Key to Leptogenys of China

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This worker key is based on: Zhou, S., Chen, Y., Chen, Z., Zhou, P., Ban, D. & Huang, M. 2012. Two new species of the genus Leptogenys from Guangxi, China. Sociobiology 59: 885-892 and Xu, Z.H. 2000A. Five new species and one new record of the ant genus Leptogenys Roger (Hymenoptera: Formicidae) from Yunnan Province, China. Entomologia Sinica. 7:117-126.

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1

  • Masticatory margin of mandible with 3 or more than 3 teeth. Head nearly square . . . . . 2
  • Masticatory margin of mandible without or with only 1 tooth. Head elongate, distinctly longer than broad . . . . . 5
Xu 2000. Figures 1-28.

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3

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  • Masticatory margin of mandible with 3 teeth, inner margin without tooth. In dorsal view petiolar node trapezoid (Figs. 1-4) (China: Yunnan Province; Myanmar) . . . . . Leptogenys crassicornis
Leptogenys crassicornis casent0281924 p 1 high.jpg
  • Masticatory margin of mandible with more than 5 teeth, in dorsal view petiolar node subsemicirular (China: Hunan, Guangxi) . . . . . Leptogenys strena

4

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  • Inner margin of mandible with 1 tooth. In dorsal view petiolar node semicircular. Head and alitrunk black (Figs. 5-8) (China: Yunnan Province) . . . . . Leptogenys huangdii
  • Inner margin of mandible with 3 or more than 3 teeth. In dorsal view petiolar node crescent-shaped. Head and alitrunk dark reddish brown (Figs. 9-12) (China: Yunnan Province; Myanmar; India) . . . . . Leptogenys birmana
Leptogenys birmana casent0281921 p 1 high.jpg

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  • Head longitudinally striate or densely punctate . . . . . 11

6

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  • Scape of antenna surpassing occipital corner by half of its length (Figs. 13-16) (China: Yunnan Province) . . . . . Leptogenys pangui
  • Scape of antenna surpassing occipital corner by less than half of its length . . . . . 7

7

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  • Head, alitrunk and gaster without metallic luster . . . . . 8
  • Head, alitrunk and gaster with blue or purple metallic luster . . . . . 9

8

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  • Anterior margin of clypeus not truncate, without denticle in the middle (China: Zhejiang, Hunan; Vietnam: Myanmar: Sri Lanka) . . . . . Leptogenys peuqueti
Leptogenys peuqueti casent0281935 p 1 high.jpg
  • Anterior margin of clypeus truncate, with a pair of denticles in the middle (China: Guangxi) . . . . . Leptogenys laeviterga

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  • Anterior margin of clypeus truncate (Figs. 17-20) (China: Yunnan Guangxi, Taiwan; India; Sri Lanka; Philippines) . . . . . Leptogenys chinensis
Leptogenys chinensis casent0270544 p 1 high.jpg

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  • Body black. Subpetiolar process rounded at apex (Figs. 21-24) (China: Yunnan, HunanGuangxi, Hong Kong, Macao; Myanmar; India; Bangladesh) . . . . . Leptogenys minchinii
Leptogenys minchinii casent0907379 p 1 high.jpg
  • Body dark yellowish brown. Subpetiolar process triangular, angled at apex (Figs. 25-28) (China: Taiwan Province; Japan) . . . . . Leptogenys confucii

11

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Xu 2000. Figures 29-52.

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  • Clypeus with longitudinal central carina (Figs. 29-32) (China: Yunnan, Guangdong, Guangxi, Taiwan; Myanmar; India; Sikkim; Sri Lanka; Malaysia) . . . . . Leptogenys diminuta
Leptogenys diminuta casent0106010 profile 1.jpg
  • Clypeus without longitudinal central carina (Figs. 33-36) (China: Yunnan, Guizhou, Hunan, Guangxi, Fujian, Taiwan, Hong Kong; Myanmar; Sikkim; India) . . . . . Leptogenys kitteli
Leptogenys kitteli casent0217530 p 1 high.jpg

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  • Masticatory margin of mandible as long as inner margin. Masticatory margin with 1 small tooth in the middle (Figs. 37-40) (China: Yunnan) . . . . . Leptogenys zhuangzii
  • Masticatory margin of mandible shorter than inner margin. Masticatory margin without tooth in the middle . . . . . 14

14

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15

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  • Anterior margin of clypeus with a pair of denticles in the middle . . . . . 16

16

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  • Head, alitrunk, and petiole densely and coarsely punctate (China: Guangxi) . . . . . Leptogenys binghamii
  • Dorsum of head in front of the eyes finely punctuate, alitrunk and petiole smooth and shining (China: Guangxi) . . . . . Leptogenys rufida

17

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  • Masticatory and inner margins of mandible separated by a blunt angle (China: Yunnan Province) . . . . . Leptogenys mengzii
  • Masticatory margin of mandible rounded into inner margin . . . . . 18

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  • Dorsum of propodeum a little longer than declivity, 2nd segment of flagellum of antenna longer than the 3rd segment (China: Guangxi) . . . . . Leptogenys hezhouensis
  • Dorsum of propodeum about 3 times as long as declivity, 2nd and 3rd segments of flagellum of antenna about equal (China: Yunnan) . . . . . Leptogenys laozii