5. Formica festina ^HNS.

F. nigra, nitida; flagello fulvo; thoracesubtus, metathorace pedibusque et petiolo pallide ferrugineis; abdomine subtus piceo.

Female. Length 9-10 lines. Black and shining: head oblong-quadrate; the mandibles and anterior margin of the face rufo-piceous; the flagellum fulvous. Thorax: beneath, the sides, the metathorax and the legs, pale ferruginous; wings subhyaline, their nervures ferruginous; scale of the abdomen pale ferruginous, ovate and slightly emarginate above; the posterior margins of the segments of the abdomen, above, pale rufo-testaceous; beneath, entirely pale.

Hab. Borneo (Sarawak).

This species closely resembles the European species F. ligniperda ^HNS -in fact appears to be the exotic form of that insect.