17. Polyrhachis exasperatus ^HNS.

P. niger, capite thoraceque rude punctatis, abdomine nitido; thorace antice et postice spinis duabus longis acutis armato; squama spinis duabus longis curvatis acutis armata; pedibus obscure ferrugineis.

Worker. Length 2 3 / 4 lines. Black; the head anteriorly, the mandibles and flagellum obscure ferruginous; the head, thorax, and node of the peduncle very coarsely and closely punctured, producing a rugged surface. The thorax, with two short stout acute spines bent inwards, the metathorax with two long divergent acute spines; the peduncle with two long acute spines, which curve to the shape of the base of the abdomen; the legs ferruginous, more or less obscurely so. The abdomen globose, smooth, and shining. (Pl. I. fig. 15, and 16 var.) Hah. Celebes (Tondano).