54. Polyrhachis femoratus ^HNS. Pl. IV. fig. 46. B.M.

Worker. Length 4 lines.-Black: head and thorax opake, abdomen smooth and shining; the clypeus with a slight central carina; the extreme apex of the flagellum pale rufo-testaceous, the palpi ferruginous. Thorax compressed, slightly convex above, the lateral margins acute, distinctly divided into three portions by two transverse sutures, the anterior one curved; the metathorax truncate, the truncation smooth and shining, the lateral angles of its verge recurved; the coxae and femora ferruginous, the apex of the latter black. Abdomen: the scale subquadrate, and armed with four acute angular spines on its superior margin.

Hab . Australia (Melbourne).