Formica sedula

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 : 56

15. Formica sedula .

F. capite thorace pedibusque opacis nigris, abdomine castaneo.

Worker. Length 5 lines. Head and thorax opake-black, the mandibles and legs shining black; the abdomen chestnut-red. The mandibles smooth at their base, and striated at their apex, with five stout teeth, the flagellum fusco-ferruginous; the head deeply emarginate behind; much wider than the thorax; the thorax compressed; the trochanters and apical joints of the tarsi ferruginous. Abdomen ovate and thinly sprinkled with reddish pubescence; the scale subquadrate; emarginate above, and slightly ferruginous; the head and thorax with a few erect black hairs.

Hab. Borneo (Sarawak).

Resembles F. compressa , but differs in having much stouter legs, in being pubescent, in having the posterior angles of the head more rounded, and in being pubescent.