Formica gracilipes

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 : 55

13. Formica gracilipes .

F. ferruginea, abdomine (basi excepto) obscure rufo-piceo.

Worker. Length 2 lines. Pale ferruginous, abdomen dark rufo-piceous; antennae longer than the body; head ovate, and wider than the thorax, narrowed behind; the eyes black and prominent. Thorax elongate and compressed; the prothorax narrowed into a slender neck; legs very much elongated, the posterior pair one-third longer than the insect, the tibiae and tarsi pale testaceous; the abdominal scale incrassate, rounded in front and truncate behind; the abdomen dark rufopiceous, short and ovate; the base more or less pale ferruginous. Hab. Singapore.