Key to Leptogenys of China

This worker key is based on: 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 . . . . . 4

2
return to couplet #1
 * 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 3 teeth, inner margin with teeth. In dorsal view petiolar node not trapezoid . . . . . 3

3
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 nearly crescent. Head and alitrunk dark reddish brown (Figs. 9-12) (China: Yunnan Province; Myanmar; India) . . . . . Leptogenys birmana

4
return to couplet #1
 * Head smooth and shining . . . . . 5


 * Head longitudinally striate or densely punctate . . . . . 9

5
return to couplet #4
 * Scape of antenna surpassed occipital corner by half of its length (Figs. 13-16) (China: Yunnan Province) . . . . . Leptogenys pangui


 * Scape of antenna surpassed occipital corner by less than half of its length . . . . . 6

6
return to couplet #5
 * Head, alitrunk and gaster without metallic luster (China: Zhejiang Province; Vietnam; Myanmar; Sri Lanka) . . . . . Leptogenys peuqueti


 * Head, alitrunk and gaster with blue or purple metallic luster . . . . . 7

7
return to couplet #6
 * Median lobe of clypeus truncate at apex (Figs. 17-20) (China: Yunnan and Taiwan Provinces; India; Sri Lanka; Philippines) . . . . . Leptogenys chinensis


 * Median lobe of clypeus extruding at apex . . . . . 8

8
return to couplet #7
 * Body black. Subpetiolar process rounded at apex (Figs. 21-24) (China: Yunnan Province, Hong Kong, Macao; Myanmar; India; Bangladesh) . . . . . Leptogenys minchinii


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

9
return to couplet #4
 * Head longitudinally striate . . . . . 10


 * Head densely punctate . . . . . 11

10
return to couplet #9
 * Clypeus with longitudinal central carina (Figs. 29-32) (China: Yunnan, Guangdong and Taiwan Provinces; Myanmar; India; Sikkim; Sri Lanka; Malaysia) . . . . . Leptogenys diminuta


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

11
return to couplet #9
 * Masticatory margin of mandible as long as inner margin. Masticatory margin with 1 small tooth in the middle (Figs. 37-40) (China: Yunnan Province) . . . . . Leptogenys zhuangzii


 * Masticatory margin of mandible shorter than inner margin. Masticatory margin without tooth in the middle . . . . . 12

12
return to couplet #11
 * Masticatory margin of mandible rounded into inner margin. Propodeum lower than promesonotum (Figs. 41-44) (China: Yunnan Province) . . . . . Leptogenys laozii


 * Masticatory and inner margins of mandible separated by a blunt angle. Propodeum as high as promesonotum (Figs. 45-52) (China: Yunnan Province) . . . . . Leptogenys mengzii