orly, 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.

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 a