Formica irritans

Smith, F., 1857, Catalogue of the hymenopterous insects collected at Sarawak, Borneo; Mount Ophir, Malacca; and at Singapore, by A. R. Wallace., Journal of the Proceedings of the Linnean Society of London, Zoology 2, pp. 42-88 : 58

20. Formica irritans .

F. nigra; antennis, thorace pedunculisque squama ferrugineis.

' Worker. Length 6 lines. Head and abdomen nigro-fuscous; antennae, thorax, and scale of the abdomen, as well as the legs, ferruginous. Elongate and slender, the head ovate; the apex of the scape ferruginous; the clypeus and mandibles dark rufo-piceous. The thorax elongate, compressed, with the prothorax slightly dilated at the sides. Abdomen ovate: the scale incrassate, rounded anteriorly, and truncate behind; the entire insect thinly sprinkled with erect, long, pale pubescence.

Worker ( minor ). Length 3 lines. This only differs in having the antennae entirely pale ferruginous.

Hab. Borneo (Sarawak).

This is probably the worker of Formica diligens .