50 . Myrmica carbonaria ^HNS. B.M.

Worker. Length 1 line.-Coal-black, smooth and shining: the antennae and legs dark rufo-fuscous, scarcely black; the basal joints of the flagellum, the articulations of the legs and the tarsi, pale rufo-testaceous, the claw-joint of the tarsi darkest. Thorax about the same length as the head, with a deep strangulation between the meso- and metathorax, the latter truncate behind, not spined. Abdomen ovate, truncate at the base, pointed at the apex, the nodes elevated and rounded above.

Female. Length 2 lines.-Of the same colour as the worker, differing only in the sexual characteristics of length of thorax and abdomen.

Male. Length 2 lines.-Head and thorax opake black, the legs and abdomen shining; the clypeus, scutellum, and verge of the truncation of the metathorax, shining; wings colourless and iridescent, the costal nervure' and stigma testaceous; abdomen oblong-ovate; the nodes of the petiole transverse, their upper margin subemarginate.

Hab. Madeira. (Coll. T. V. Wollaston, Esq.)