1a. Antennae nine-segmented Brachymyrmex depilis
1b. Antennae twelve-segmented 2
2a. Thorax smooth, convex profile Camponotus
2b. Thorax not as smooth, convex profile 3
3a. Maxillary palps short, 3-segmented Lasius subgenus Acanthomyops
3b. Maxillary palps longer, 6-segmented 4
4a. Frontal carinae prominent, ocelli distinct, large Formica
4b. Frontal carinae small or indistinct, ocelli vage, small 5
5a. Antennal scapes surpassing occipital margin by at least 1/3 length, usually longer; erect hairs on body long and brown or black Prenolepis imparis
5b. Antennal scapes shorter; erect body hairs short and golden; small (generally < 0.5 cm), yellow or brownish; mesonotum pyramidal in profile Lasius