5. FORMICA COXALIS. _F._ nigra, nitida; flagello, coxis et abdomine subtus pallide testaceis. _Worker major._ Length 5 lines. Black and very delicately roughened with a fine transverse waved striation only perceptible under a good magnifying power. Head large, much wider than the thorax, oblong-ovate with a deep emargination behind; the clypeus slightly produced and truncate anteriorly, the angles of the truncation rounded, and with a central shining carina; the flagellum, except the tarsal joint, pale rufo-testaceous. Thorax elongate, compressed behind, the coxae pale rufo-testaceous. Abdomen ovate, the scale of the petiole incrassate, somewhat wedge-shaped when viewed sideways, the abdomen sparingly sprinkled with long pale hairs. 6. FORMICA CORDATA. _F._ pallide rufa; abdomine fusco, capite cordato. _Worker._ Length 2 lines. Pale rufo-testaceous; the head heart-shaped; the eyes black, the flagellum fusco-ferruginous with the basal joints pale; the mandibles ferruginous. Thorax narrow, deeply strangulated at the base of the metathorax. Abdomen more or less fuscous, the node of the petiole narrow and pointed above; the entire insect is smooth and shining. _Hab._ Aru. The _worker minor_ is rather smaller and has the abdomen darker, in all the specimens received, but in other respects agrees with the above. 7. FORMICA OCULATA. _F._ pallide ferruginea; capite oblongo, oculis magnis, thorace compresso. _Worker._ Length 2-1/2 lines. Pale ferruginous, with the vertex and apex of the abdomen black; the head oblong, the sides nearly parallel, with the anterior margin truncate; the mandibles with fine acute teeth on their inner margin; the antennae inserted wide apart about the middle of the head; the eyes very large and ovate, placed backwards on the sides of the head, reaching to the posterior margin of the vertex, forming as it were its posterior lateral angles. The thorax narrow and compressed behind; abdomen ovate, entirely smooth and shining. _Hab._ Aru. 8. FORMICA MUTILATA. _F._ nigra; capite oblongo, truncato antice et sanguineo, antennis tarsisque rufo-testaceis. _Worker._ Length 2-3/4 lines. Black and shining; the head truncate anteriorly, the antennae inserted wide apart, about the middle, the face blood-red before their insertion and deeply striated longitudinally, behind the antennae the head is black, smooth, and shining; the eyes ovate and placed backwards on the sides of the head. Thorax rounded in front and strangulated between the meso- and metathorax, the latter obliquely truncate; legs rather short and stout, the femora compressed, the anterior pair broadly dilated, the base and apex of the femora, the tibiae, and tarsi rufo-testaceous, the tibiae with a darker stain behind. Abdomen oblong-ovate, the apical margins of the segments narrowly pale testaceous; the scale of the petiole compressed, with its superior margin rounded. _Hab._ Aru.