51. Myrmica subopaca ^HNS. U.M.

"Worker. Length 1 1/4 line.-Head, thorax, legs, and nodes of the petiole, dull rufo-testaceous; abdomen shining black, varying in depth of colour, small workers being sometimes pale red with the thorax black. The articulations of the legs and the tarsi pale rufo-testaceous, the head before the insertion of the antennae and mandibles pale ferruginous; the metathorax with a longitudinal groove, not spined; the head and thorax smooth; the nodes of the petiole elevated, blunt above; abdomen ovate, truncate at the base, pointed at the apex.

Female. Length 2 1/4 lines.-Opake fusco-ferruginous; abdomen black, with the base reddish, the articulations of the legs and the tarsi pale rufo-testaceous; the thorax in the middle in front, and the scutellum, of a brighter red; the metathorax with a deep excavation; abdomen oblong-ovate, thinly sprinkled with short pale glittering hairs.

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