Diagnosis. Myrmicine ant with antennae 11-segmented; in side view, petiole and postpetiole with high, conical, pointed nodes, the shape of which is unique among the ants (Bolton1994, Shattuck 1999). For additional characters see Taylor (1970).
Key to Species of Peronomyrmex based on Workers
1. Sculpturing on dorsum of head consisting of distinct longitudinal rugae ........... bartoni
- Sculpturing on dorsum of head essentially absent, limited to small, scattered punctures or superficial reticulations ............................................................................................. 2
2. Antennal scrobes relatively well developed, with distinct rugae along inner margins; posterior face of postpetiole essentially flat; area between humeral angles convex ....... .......................................................................................................................... overbecki
- Antennal scrobes little more than shallow troughs, lacking rugae along their margins; posterior face of postpetiole broadly concave; area between humeral angles flat .......... ............................................................................................................................ greavesi
