9. Polyrhachis piliventris ^HNS. Pl. IV. fig. 24. B.M.

Female. Length 3 1/4 lines. -Black: the head and thorax subrugose; abdomen smooth, shining, and covered with a fine cinereous pile. The mandibles triangular, with four or five sharp teeth on the inner edge which are rufo-piceous; the anterior margin of the clypeus rounded. Thorax oblong-ovate, the metathorax truncate; wings fulvo-hyaline, the nervures rufo-testaceous; the apical joints of the tarsi rufo-testaceous. The scale of the abdomen incrassate, subquadrate, with a stout spine at each of the superior angles, curving slightly inwards. Abdomen subglobose.

Hab. Singapore. (Coll. A. Wallace.)