Fernandes, I. O.; Delabie, J. H. C.; Fernández, F. 2019. Contribution to the Knowledge of the Genus Proceratium Roger (Hymenoptera: Formicidae: Proceratiinae) in the New World. Sociobiology 66:551-559.
http://antcat.org/documents/76…ceratium_in_new_world.pdf
or
http://periodicos.uefs.br/inde…gy/article/view/4484/4149
It also includes a New World key for the group….
