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

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

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

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

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

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

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

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

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

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