Key to Strongylognathus of China

This worker and queen key is based on: Radchenko, A.G., Zhang, Y. and J. Heinze. 2017. A new species of the ant genus Strongylognathus (Hymenoptera, Formicidae) from Inner Mongolia, with notes on the species reported from China. Asian Myrmecology. 9:e009016. doi:10.20362/am.009016

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 * Strongylognathus
 * China

1

 * occipital margin strongly concave (seen from above) (Fig. 5, A), posterio-lateral corners of head strongly prominent. Males: occipital margin straight or feebly concave, posterio-lateral corners of the head distinctly prominent (seen in profile) (Fig. 5, C) . . . . . 2


 * Workers and queens: occipital margin straight or at most very shallowly concave (seen from above), posterio-lateral corners of the head rounded and not prominent (Figs 1, A, B; 2, A, B; 5, B). Males: occipital margin straight or feebly convex, posterio-lateral corners of the head not prominent (seen in profile) (Fig. 5, D) . . . . . 3

2
return to couplet #1
 * Workers (queens and males unknown): outer margin of mandibles with four minute . . . . . Strongylognathus tylonus


 * Queens (workers unknown): outer margin of mandibles without any additional structures . . . . . Strongylognathus potanini

3
return to couplet #1
 * Workers occipital margin, temples and genae with standing hairs (Fig. 1, A). Darker species, mesosoma reddish-brown, head dark brown to blackish-brown . . . . . Strongylognathus dao


 * Workers (queens and males unknown): standing hairs on head restricted to the occipital margin and occipital corners (Fig. 5, B). Lighter species, mesosoma orange-yellow or ochreous, head yellowish-brown . . . . . Strongylognathus koreanus