13. Formica gracilipes ^HNS.

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.