28. Atta fumipennis ^HNS. B.M.

Female. Length 3 1/2 lines.-Pale ferruginous and opake, with the scape, basal joints of the flagellum, and the legs pale; the apical joints of the antennae and the margins of the mandibles dusky. The head and thorax very evenly and delicately striated; the wings smoky, palest at their base, with the nervures fuscous; the second and following segments of the abdomen shining. Worker. Length 1 1/4 line.-Pale rufo-testaceous, not shining: head oblong-ovate, with the mandibles bent, and very acute at their apex, their inner margin furnished with acute teeth; the thorax narrowed, and nearly parallel behind the prothorax; the metathorax armed with two upright acute spines. Abdomen ovate, truncate at the base, and more or less fuscous at the apex.

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