Worker major. Length 1 1/2 line.-Pale reddish-yellow, with the abdomen slightly fuscous, the head and thorax opake, the abdomen shining. The head very large, the sides rounded, deeply emarginate behind, with a central longitudinal channel extending to the clypeus; the latter, as well as the mandibles, smooth and shining; the inner margin of the mandibles black. The divisions between the pro-, meso- and metathorax strongly marked, the latter with two short acute spines.
Worker minor.-About a line in length, slender, and having the head of ordinary size; the head and abdomen more or less fuscous.
Hab. Brazil (Villa Nova).
