1. Solenopsis cephalotes. S. pallidè ferruginea; capite maximè in medio sulcato, abdomine apice fusco.
Worker major. Length 2½ lines. Pale ferruginous, with the anterior part of the face darker, the mandibles incrassate and very dark fusco-ferruginous; 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 antennæ 2-jointed.
Worker minor. Length 1½ 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 antennæ longer, as well as the petiole of the abdomen; the body is very smooth and shining, the club of the antennæ 2-jointed.
Hab. Aru.
Subfam. Cryptoceridæ, Smith.
Gen. Meranoplus, Smith.
1. Meranoplus spinosus. M. castaneo-rufus; abdomine nigro, thorace sexspinoso; abdomine ovato.
Worker. Length 1½ line. Head and thorax rugose; the antennæ and tarsi rufo-testaceous; the eyes rather prominent, the groove above them at the sides of the head extending backwards to the vertex. Thorax: the anterior margin curved forwards, the lateral angles produced into a bifurcate process on each side, behind the processes, slightly narrowed to the base of a long curved tooth; the posterior margin emarginate with a long sharp spine at each angle of the emargination; the node of the petiole globose. Abdomen black, smooth and shining.
Hab. Aru.
Fam. MUTILLIDÆ, Leach.