Key to Lophomyrmex of South China, Indo-China and Thailand

This worker key is based on: [[Media:Yamane, S. & Hosoishi, S. 2014. Second Vietnamese species of the myrmicine genus Lophomyrmex. Halteres, 5, 64-68.pdf|Yamane, S. & Hosoishi, S. 2014. Second Vietnamese species of the myrmicine genus Lophomyrmex (Hymenoptera, Formicidae). Halteres, 5:64-68.]]

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Lophomyrmex

1

 * In dorsal view pronotum anteriorly with pair of lateral spines/teeth (quadrispinosus group). . . . . . 2


 * In dorsal view pronotum without pair of lateral spines/teeth, but with lateral irregular carinae only (bedoti group). . . . . . 3

2
return to couplet #1
 * Pronotal spine short, mere denticle. Antennal scape short, with head in full-face view hardly extending beyond posterior margin of head. Taiwan . . . . . Lophomyrmex taivanae


 * Pronotal spine distinctly protruding and apically bluntly pointed. Antennal scape relatively long, with head in full-face view distinctly surpassing posterior margin of head. Thailand, Myanmar, Vietnam, Sri Lanka . . . . . Lophomyrmex birmanus

3
return to couplet #1
 * Mesosoma extensively smooth and shiny; only upper portion of mesopleuron reticulate. Malay Peninsula, Thailand. . . . . . Lophomyrmex lucidus


 * Mesosoma extensively sculptured; only pronotum often smooth. . . . . . 4

4
return to couplet #3
 * Antennal scape long, with head in full-face view distinctly surpassing posterior margin of head; SI 100-103. Eye weakly narrowed anteriad with rounded apex; number of ommatidia along long axis of eye 8-9. S. Vietnam . . . . . Lophomyrmex indosinensis


 * Antennal scape shorter, hardly reaching posterior margin of head; SI smaller than 95 (generally ca. 90). Eye strongly narrowed anteriad, often with pointed apex; number of ommatidia along long axis of eye 6-7 (rarely 8) . . . . . 5

5
return to couplet #4
 * Lateral face of pronotum and head behind and below eye shiny, at most faintly sculptured. Propodeal spine more or less distinctly upward-directed with its apex much higher than propodeal dorsum. Palawan, Borneo, Sumatra, Malay Peninsula, Thailand, Myanmar, India, Sri Lanka. . . . . . Lophomyrmex bedoti


 * Lateral face of pronotum and head behind and below eye at least superficially sculptured. Propodeal spine nearly backward-directed with its apex only slightly higher than propodeal dorsum. Thailand . . . . . Lophomyrmex striatulus