64. Myrmica barbata.

Female. Length 5 1/2 lines.-Ferruginous: the head finely striated longitudinally, smooth and shining beneath; the cheeks with a long beard of pale ferruginous hairs; mandibles very stout, strongly striated, their inner edge with a row of acute teeth, and a longer acute one at the apex. Thorax ovate, pubescent, the metathorax armed with two stout spines, and transversely striated; the wings hyaline, with a yellowish tinge towards their base, the nervures ferruginous, the stigma fuscous; the legs covered with short pale pubescence. Abdomen: the first node of the petiole roughened, the second transverse and smooth, the petiole with a tooth at its base beneath; the abdomen ovate, and, as well as the nodes, thinly sprinkled with pale pubescence.

Hab. Mexico. (Coll. F. Smith.)