1. Solenopsis cephalotes ^HNS.

S. pallide ferruginea; capite maxime in medio sulcato, abdomine apice fusco.

Worker major. Length 2 1 / 2 lines. Pale ferruginous, with the anterior part of the face darker, the mandibles incrassate and very dark fuscoferruginous; head very large and divided by a deep longitudinal channel, emarginate behind, nearly quadrate; the eyes small and placed forwards on the sides of the head. The metathorax truncate, not spined. Abdomen ovate, truncate at the base, its apex fuscous; the first node of the petiole compressed, its margin rounded above, the second node incrassate and subglobose; club of the antennae 2 - jointed.

Worker minor. Length 1 1 / 2 line. Of the same colour as the worker major, but with the head of the ordinary size and slightly narrowed behind, the mandibles of the same colour as the head; the legs and antennae longer, as well as the petiole of the abdomen; the body is very smooth and shining, the club of the antennae; 2 - jointed.

Hab. Aru.