Key to Neotropical Centromyrmex

This key was originally published by Kempf, W.W. 1967. A synopsis of the Neotropical ants of the genus Centromyrmex Mayr (Hymenoptera: Formicidae). Stud. Entomol. 9: 401-410

1

 * Petiole scarcely longer than broad, the anterior face of node oblique, the dorsal face completely rounded in profile; clypeus with a prominent tumulus on disc . . . . . Centromyrmex alfaroi
 * Petiole distinctly longer than broad, anterior face of node perpendicular to elongate and straight dorsal face; clypeus without a tumulus on disc . . . . . 2

2
return to couplet 1
 * Smaller species, thorax length not over 2 mm; mandibles minutely to indistinctly denticulate, chewing border forming almost a right angle with basal border; petiole with a short and pointed subpetiolar process . . . . . Centromyrmex brachycola
 * Larger species, thorax length well over 2.5 mm; mandibles distinctly dentate on basal third, chewing border forming a very. obtuse angle with basal border; petiole with a prominent apically rounded to subtruncate subpetiolar process . . . . . Centromyrmex gigas