Pseudomyrmex

Ants in the genus Pseudomyrmex have large eyes, a distinct postpetiole and a well developed sting. Species of Pseudomyrmex are predominantly arboreal, and they occur from southern United States to Argentina and Chile.

Workers and queens of Pseudomyrmex ants are distinctive: the eyes are large, conspicuous and elongate (width of eye two thirds or less of length); the first antennal segment, or scape, is relatively short, less than three-quarters of head length; there is a well developed postpetiole (i.e., a second node-like structure at the "waist"); and a well developed sting. The pronotum and mesonotum of the worker are unfused, and freely articulate with one another. The basal margin of the mandible nearly always has a proximal tooth.