4. Formica flavitarsus ^HNS.

F. nigra, elongata et gracilis; thorace postice compresso, pedibus elongatis, tarsis flavis.

Worker. Length 4 lines. Black and sub-opake; head elongate, narrowed behind, the clypeus truncate anteriorly, the mandibles pale ferruginous; antennae elongate and slender, the flagellum filiform and pale rufo-testaceous; the thorax and legs elongate, the latter slender with their tarsi pale rufo-testaceous. Abdomen ovate, the scale of the petiole incrassate and slightly notched above.

Hab. Aru.