43. Polyrhachis cyaniventris ^HNS. Pl. IV. fig. 47. B.M.

Worker. Length 4 lines.-Head and thorax green, and with a cinereous pilosity; legs and antennae black; the abdomen of a dark blue-green, entirely subopake. Head oblong, scarcely narrowed behind the eyes, the hinder margin transverse; the head and abdomen very finely longitudinally aciculate, the thorax rather coarsely so; antennae not quite so long as the body. Thorax rather short, flattened at the sides and above, widest in front; the divisions of the pro-, meso- and metathorax distinctly marked, the metathorax abruptly truncated, the verge of the truncation margined; the prothorax with a stout acute spine at the anterior lateral angles; legs smooth, without spines or pubescence. Abdomen ovate; the scale of the peduncle very broad in front, slightly rounded, behind slightly concave, the superior margin nearly straight, its lateral angles with a short acute spine, which has a smaller one at its base outside.

Hab. Philippine Islands.