Key to Subfamilies of Formicidae in Mississippi (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.

All pictures by Joe MacGown and copywrited by Entomological Museum
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