26. Polyrhachis Sumatrensis ^HNS. Pl. IV. fig. 43. B.M.

Female. Length 4 1/4 lines.-Head and thorax opake-black; abdomen slightly shining and pubescent. Head narrowed behind the eyes, which are ovate and prominent; in front of the eyes oblong-quadrate, with the anterior margin of the clypeus rounded. Thorax oblong-ovate, with the metathorax truncated, the verge of the truncation margined; the prothorax with an acute spine on each side; wings fusco-hyaline, the nervures testaceous, the stigma and costal nervure brown; the legs slightly pubescent. Abdomen subglobose; the scale of the peduncle incrassate, rounded in front and slightly convex behind; viewed in front somewhat quadrate, but widest above, the superior margin with the lateral angles produced into short acute teeth, the middle of the margin subdentate; there is also a short acute spine on each side beneath the lateral angles.

Hab. Sumatra.