150. Formica abrupta ^HNS.

Worker. Length 3 lines. - Light reddish-brown, thinly sprinkled over with erect pale hairs. Head subovate, emarginate behind; eyes round, placed midway on the sides of the head; the mandibles with a number of small black teeth on their inner margin. Thorax elongate, narrowed and compressed behind; the metathorax elevated, then abruptly truncated at the apex, the truncation slightly curved inwardly; the metathorax above with its lateral margins raised, forming a sort of subdentate process at the verge of the truncation; legs elongate and pubescent. Abdomen ovate; the scale of the peduncle incrassate, rounded in front to fit into the curved truncation, and hollowed behind to receive the base of the abdomen.

Hab. Brazil. (Coll. F. Smith.)