Pseudomyrmex mixtecus Ward, 1993
Worker diagnosis. HW 0.89-1.03; head broad (CI 0.86-0.95); median clypeal lobe laterally rounded; frontal carinae relatively well separated (FCI > 0.05); head densely punctulate and opaque; black or dark brownish-black.
Distribution. Southern Mexico (Guerrero, Oaxaca).
Biology. Little is known about P. mixtecus, an obligate acacia-ant whose colonies have been recorded from Acacia collinsii and A. hindsii.