16. Formica exasperata ^HNS.

F. capite thorace abdominisque squama sanguineis; tarsorum unguibus abdominisque basi rufis; thorace compresso.

Worker. Length 5 1/2 lines. Head and thorax blood-red; sometimes blackish before the insertion of the antennae, and also a little in front of the anterior stemma; in some examples entirely red; the mandibles black, stout, strongly toothed and punctured; the head deeply emarginate posteriorly, and much wider than the thorax. Thorax: compressed, sometimes with fuscous stains at the sides, with the tibiae and tarsi more or less fuscous; the head, thorax and legs with a thin scattered pale reddish pubescence. Abdomen: black, subopake, with the apical margins of the segments usually more or less rufopiceous; the scale erect, ovate and entire.

Hab. Borneo (Sarawak).

The general form of this species is that of F. compressa ^HNS; the antennae are shorter, with shorter joints, and the legs are considerably stouter.

Hab. Borneo (Sarawak).