Key to Perissomyrmex

This worker key is based on: Xu Z.-H. and Zhang C.-L. 2012. Review of the myrmicine ant genus Perissomyrmex M. R. Smith, 1947 with description of a new species from Tibet, China. Myrmecological News. 17:147-154.

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Perissomyrmex

1

 * In profile view, petiolar node thick, much longer than anterior peduncle, dorsum weakly convex. Anteroventral corner of petiole with distinct small tooth (Figs. 1-5) (Central America: Guatemala, Mexico) . . . . . Perissomyrmex snyderi


 * In profile view, petiolar node narrow, about as long as anterior peduncle, dorsum strongly convex. Anteroventral corner of petiole without distinct small tooth (East Asia). . . . . . 2

2
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 * Head and mesosoma smooth. Color black (Figs. 6-11) (China: Tibet) . . . . . Perissomyrmex medogensis


 * Head and mesosoma coarsely longitudinally striate. Color mainly brown. . . . . . 3

3
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 * Anterior margin of clypeus with only one pair of stout teeth, apices of teeth usually obliquely truncated, sometimes weakly bifid (Figs. 22-26) (China: Henan, Shaanxi, and Sichuan Provinces) . . . . . Perissomyrmex bidentatus


 * Anterior margin of clypeus with two or three pairs of teeth or denticles. . . . . . 4

4
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 * Anterior margin of clypeus with two pairs of subequal teeth (Figs. 36-38) (China: Guizhou Province) . . . . . Perissomyrmex guizhouensis
 * Anterior margin of clypeus with one pair of large median teeth and one or two pairs of small lateral denticles. . . . . . 5

5
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 * Anterior margin of clypeus with one pair of large median teeth and two pairs of small lateral denticles. Color brown, gaster black (Figs. 39-42) (China: Yunnan Province) . . . . . Perissomyrmex fissus


 * Anterior margin of clypeus with one pair of large median teeth and one pair of small lateral denticles. Color blackish brown, gaster reddish brown (Figs. 43-45) (Bhutan, Nepal, India) . . . . . Perissomyrmex monticola