13. Polyrhachis trispinosus ^HNS.

P. niger, laevis nitidusque; thorace inermi; petioli squama trispinosa.

Female. Length 4 lines. Jet black, smooth and shining; the antennae long and slender with the apical half ferruginous; the front of the head very convex. Thorax ovate, very delicately striated, the striae, short and irregular, may be called a faint scratching; wings wanting; the node of the peduncle with three short acute spines above; the claws of the tarsi rufo-testaceous. Abdomen ovate and very smooth and shining. (Pl. I. fig. 11.)

Hab. Celebes (Tondano).