Three species of the genus Brachymyrmex: B. admotus Mayr, B. brevicornis Emery y B. gaucho Santschi are redescribed hereafter. Descriptions and drawings of main morphological characters of gynes, males and workers are given. New characters are used to differentiate species, mainly based on male head morphology and genitalia. New Argentine localities are added to the known distribution.
Ants; taxonomy; revision; distribution
