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Key to Subfamilies of Formicidae in the Southeastern United States (based on workers)
(modified from Creighton (1950) and Bolton (1994)
Couplet 1
1 Alitrunk (Mesosoma) attached to gaster with one distinct segment, the petiole (figure 1)...couplet 2
1' Alitrunk attached to gaster with two distinct segments, the petiole and postpetiole (figure 2)...couplet 7
Figure 1. Camponotus castaneus worker with arrow pointing to petiole.

Figure 2. Myrmica punctiventris worker with arrows pointing to petiole and post petiole.