10. Polyrhachis olenus ^HNS.

P. niger; thorace supra deplanato, spinis duabus acutis anterioribus; squama spinis duabus longis armata; corpore aureo-sericeo vestito.

Worker. Length 3 lines. ' Black and clothed with ashy silky pile; the palpi pale rufo-testaceous. Thorax flattened above, with the lateral margins raised, armed in front with two divergent flattened acute spines; the metathorax truncate, and with the margin at the verge of the truncation acute and slightly raised; the node of the peduncle armed with two long acute divergent spines which curve backwards over the base of the abdomen; the latter globose. (Pl. I. fig. 8.) Hab. Celebes (Tondano).