18. Polyrhachis vibidia ^HNS.

P. niger, capite thoraceque rude punc-tatis; thorace ovato, antice posticeque abdomimsque squama spinis duabus acutis armatis; abdomine ovato.

Female. Length 3 1 / 2 lines. Black; the head and thorax with large deep punctures; the head with a large prominence in front, the lateral margins of which are expanded into elevated flat scales, beneath which the antennae are inserted, the extreme tip of the latter pale rufo-testaceous; the eyes very prominent. Thorax ovate, with a short stout spine on each side in front; the metathorax with two stout acute spines, rather longer than the front ones; the node of the peduncle with two short divergent acute spines; the tibiae and femora ferruginous, the apex of the latter and base of the former dusky or black; the claws of the tarsi rufo-testaceous. Abdomen globose, smooth and shining; the entire insect thinly covered with cinereous pubescent pile. (Pl. I. fig. 17.)

Hab. Celebes (Tondano).