1. Brachymyrmex 1) 9-segmented antenna 2) Eyes well developed

2. Acropyga 1) 10- or 11-segmented antenna 2) Eye minute, nearly vestigial (these are queens)

3. Camponotus 1) workers polymorphic 2) mesosomal profile continuous and convex with metanotal suture rarely impressed 3) Antennal sockets located well behind clypeal margin (distance greater than width of antenna 4) 12-segmented antenna

4. Formica 1) Ocelli present 2) 12-segmented antenna 3) Antennal socket at base of or adjacent to clypeal margin 4) In profile, propodeum distinctly depressed below level of promesonotum and metanotal suture always impressed 5) Polymorphic workers

5. Polyergus 1) Falcate (sickle-shaped) mandibles 2) Ocelli present 3) 12-segmented antenna

6. Myrmecocystus 1) Maxillary palp greatly elongate (segment 4 >> 5+6) (exceeds head length) 2) Psammophore in most species 3) Often polymorphic 4) 12-segmented antenna

7. Paratrechina 1) Erect hairs on mesosomal dorsum coarse, bristle- like, of dark, and occurring pairs on mesosomal dorsum 2) Full face view – most or all of eye at or anterior to middle of sides 3) Scape and tibia often with erect hairs 4) Erect hairs on mesosomal dorsum slender and not occurring in pairs

8. Prenolepis 1) In dorsal view, mesosoma strongly constricted immediately behind pronotum 2) Full face view – most or all of eye posterior to middle of sides 3) Scape and tibia lacking erect hairs (short pubescence) 4) Erect hairs on mesosomal dorsum slender and not occurring in pairs

9. Lasius (Acanthomyops) 1) Citronella smell when crushed 2) Very shot 3-segmented maxillary palps 3) Metanotal suture very deeply impressed

10. Lasius 1) Maxillary palps longer (6-segmented) 2) Metanotal suture very deeply impressed