Gen. Crematogaster, Lund.
1. Crematogaster obscura, Smith, Cat. Hym. Ins., Journ. Proc. Linn. Soc. ii. 76. 4 ☿.
Hab. Aru; Borneo.
2. Crematogaster elegans. C. pallidè rufo-testaceus; abdomine nigerrimo nitido; thorace bispinoso.
Worker. Length ¾ line. Entirely pale rufo-testaceous, excepting the eyes and abdomen which are jet black; the nodes of the petiole pale, smooth, and shining. Head about the same width as the abdomen. The lateral angles of the anterior margin of the prothorax acute, the metathorax armed with two long acute spines. Abdomen heart-shaped, its apex acute.
Hab. Aru.
3. Crematogaster insularis. C. niger, lævis et nitidus; antennis tarsisque pallidè testaceis; thorace spinis duabus acutis armato.
Worker. Length 1¼ line. Black, smooth and shining; the vertex, thorax and nodes of the peduncle with an obscure ferruginous tinge; the antennæ, tarsi, and articulations of the legs pale rufo-testaceous; the spines which arm the metathorax stout, elongate, and acute, with their apex pale testaceous. Abdomen heart-shaped and very acute at the apex.
Hab. Aru.
Gen. Solenopsis, Westw.