Key to Polyrhachis flavicornis-group species from Thailand

Key to species of the Polyrhachis flavicornis species group from Thailand based on the worker caste. Modified from Jaitrong et al. (2023).

1

• Antennal scape, dorsum of mesosoma, and first gastral tergite without standing hairs => 2
• Antennal scape, dorsum of mesosoma, and first gastral tergite with dense standing hairs => 3

2

return to couplet #1

• Head, mesosoma, and petiole distinctly black => Polyrhachis flavicornis
• Head, mesosoma, and petiole reddish brown => Polyrhachis varicolor

3

return to couplet #1

• Standing hairs on antennal scape shorter than maximum width of scape; petiole including spines without standing hairs => Polyrhachis constructor
• Standing hairs on antennal scape longer than or as long as maximum width of scape; petiole including spines with dense, long standing hairs => Polyrhachis longipilosa

References

• Jaitrong, W., Yamane, S., Noon-Anant, N. 2023. The Thai species of the Polyrhachis (Myrmatopa) flavicornis Smith, 1857 species group, with description of a new species (Hymenoptera, Formicidae, Formicinae). Zootaxa 5249(4), 446–464 (doi:10.11646/zootaxa.5249.4.3).