Worker. Length 3 lines.-Ferruginous and shining: head very large, deeply emarginate behind, and with a central longitudinal channel; the clypeus smooth and shining; the face longitudinally striated anteriorly, the head behind transversely so; the mandibles very stout, their inner margins smooth and black, with a single notch at their apex, striated at their base and apex, and punctured in the midddle. Thorax, legs and base of the abdomen rather paler than the head; the former rounded in front, narrowed behind, and deeply strangulated between the meso- and metathorax, the latter armed with two acute spines.
Worker minor.-Only differs in being smaller, in having the mandibles toothed on their inner edge, in the head being smooth behind, and in being altogether of a paler colour.
Hab. Birmah.
