Key to Leptogenys of China

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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 * Leptogenys
 * Ants of China

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

2
return to couplet #1
 * Inner margin of mandible without tooth . . . . . 3
 * Inner margin of mandible with tooth . . . . . 4

3
return to couplet #2
 * 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


 * Masticatory margin of mandible with more than 5 teeth, in dorsal view petiolar node subsemicirular (China: Hunan, Guangxi) . . . . . Leptogenys strena

4
return to couplet #2
 * 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

5
return to couplet #1
 * Head smooth and shining . . . . . 6


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

6
return to couplet #5
 * 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
return to couplet #6
 * Head, alitrunk and gaster without metallic luster . . . . . 8


 * Head, alitrunk and gaster with blue or purple metallic luster . . . . . 9

8
return to couplet #7
 * Anterior margin of clypeus not truncate, without denticle in the middle (China: Zhejiang, Hunan; Vietnam: Myanmar: Sri Lanka) . . . . . Leptogenys peuqueti


 * Anterior margin of clypeus truncate, with a pair of denticles in the middle (China: Guangxi) . . . . . Leptogenys laeviterga

9
return to couplet #7
 * Anterior margin of clypeus truncate (Figs. 17-20) (China: Yunnan Guangxi, Taiwan; India; Sri Lanka; Philippines) . . . . . Leptogenys chinensis


 * Anterior margin of clypeus extruding . . . . . 10

10
return to couplet #9
 * Body black. Subpetiolar process rounded at apex (Figs. 21-24) (China: Yunnan, HunanGuangxi, Hong Kong, Macao; Myanmar; India; Bangladesh) . . . . . Leptogenys minchinii


 * Body dark yellowish brown. Subpetiolar process triangular, angled at apex (Figs. 25-28) (China: Taiwan Province; Japan) . . . . . Leptogenys confucii

11
return to couplet #5
 * Head longitudinally striate . . . . . 12


 * Head densely punctate . . . . . 13

12
return to couplet #11
 * Clypeus with longitudinal central carina (Figs. 29-32) (China: Yunnan, Guangdong, Guangxi, Taiwan; Myanmar; India; Sikkim; Sri Lanka; Malaysia) . . . . . Leptogenys diminuta


 * Clypeus without longitudinal central carina (Figs. 33-36) (China: Yunnan, Guizhou, Hunan, Guangxi, Fujian, Taiwan, Hong Kong; Myanmar; Sikkim; India) . . . . . Leptogenys kitteli

13
return to couplet #11
 * 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
return to couplet #13
 * Anterior margin of clypeus truncate . . . . . 15
 * Anterior margin of clypeus extruded . . . . . 17

15
return to couplet #14
 * Anterior margin of clypeus without denticle in the middle (China: Guangxi) . . . . . Leptogenys huapingensis


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

16
return to couplet #15
 * 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
return to couplet #14
 * 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

18
return to couplet #17
 * 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