nd 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.

This is a very singular insect in many respects, and closely resembles
in form the _Formica truncata_ of Spinola.

9. FORMICA QUADRICEPS. _F._ nigra, nitida; capite antice oblique
truncato, thorace postice compresso.

_Worker._ Length 3-1/2 lines. Shining black; head oblong-quadrate,
slightly narrowed anteriorly, with the sides nearly straight, the
posterior angles rounded, and very slightly emarginate behind; the head
obliquely truncate from the base of the clypeus; the truncation as well
as the mandibles obscurely ferruginous; the apex of the flagellum and
the apical joints of the tarsi pale rufo-testaceous. Thorax rounded
anteriorly, compressed behind, with the metathorax abruptly truncate.
The scale of the petiole narrow, incrassate, its anterior margin
slightly curved, its posterior margin straight; the abdomen ovate.

_Worker minor._ About 3 lines long, very like the larger _worker_, the
head being truncate in front; but it is, in proportion to the thorax,
narrower; the latter is compressed and abruptly truncate; in other
respects it agrees with the _worker major_.

_Hab._ Aru.

10. FORMICA LAEVISSIMA. _F._ nigra nitida laevissima, sparse pilosa;
squama oblonga subdepressa.

_Worker._ Length 4 lines. Jet-black, very smooth and shining; head wider
than the thorax, slightly emarginate behind, the sides slightly rounded;
the anterior margin of the clypeus rounded, the mandibles striated and
obscurely ferruginous; the scape with a few glittering silvery-white
hairs. Thorax not quite so wide as the head anteriorly, narrowed behind,
with the disk somewhat flattened, slightly convex, a deep strangulation
between the meso- and metathorax, the latter obliquely r