24. Atta testacea ^HNS. B.M.

Worker major. Length 2 lines.-Rufo-testaceous: the head very large, the sides rounded, deeply emarginate behind, with a central, deep, longitudinal channel extending to the clypeus; the face anteriorly coarsely and irregularly striated; the antennae and legs paler than the head. The thorax deeply strangulated between the meso- and metathorax, the latter having two minute upright acute spines. The abdomen ovate, with the base truncate.

Worker minor.-Length, a little over a line, of a slender form, the head of the ordinary size, the antennae longer than in the large worker; entirely smooth and shining, with the abdomen dusky.

Hab. Brazil (Rio). (Coll. Rev. Hamlet Clark.)