Polyrhachis flavicornis, Smith, 1857

Jaitrong, Weeyawat, Yamane, Seiki & Noon-Anant, Nawee, 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), pp. 446-464 : 448

Key to species of the Polyrhachis flavicornis species group from Thailand based on the worker caste

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. Head, mesosoma, and petiole distinctly black.......................................... P. flavicornis Smith, 1857

- Head, mesosoma, and petiole reddish brown......................................... P. varicolor Viehmeyer, 1916

3. Standing hairs on antennal scape shorter than maximum width of scape; petiole including spines without standing hairs................................................................................... P. constructor Smith, 1857

- Standing hairs on antennal scape longer than or as long as maximum width of scape; petiole including spines with dense, long standing hairs....................................................................... P. longipilosa sp. nov.