Polyrhachis chalybeus

Smith, F., 1858, Catalogue of the hymenopterous insects in the collection of the British Museum. Part VI. Formicidae., London: British Museum : 61

14. Polyrhachis chalybeus . B.M.

Worker. Length 4 lines.-Black: the metathorax, legs and abdomen steel-blue; the head delicately rugulose; eyes ovate, lateral, placed high on the head; the antennae inserted opposite the lower orbit of the eyes, each at the side of an elevated bent carina, the clypeus emarginate anteriorly, the mandibles large and stout, their apex denticulate. Thorax elongate, delicately transversely rugulose, with two stout acute spines in front, diverging outwards, and two shorter erect parallel ones on the metathorax; the femora and tibiae compressed. Abdomen smooth and shining, the peduncle armed with two long stout diverging spines which are bent backwards.

Hab. Singapore. Malacca.