ounded; the legs
and abdomen sprinkled with glittering white hairs. The node of the
petiole incrassate, very slightly elevated; viewed sideways, broadly
wedge-shaped; the abdomen ovate.

_Hab._ Aru.

11. FORMICA NITIDA. _F._ capite abdomineque nigris, antennis thoraceque
pedibusque rufo-testaceis laevissimis et lucidis.

_Worker._ Length 4 lines. Head and abdomen shining black; the flagellum,
thorax, legs, and scale of the petiole rufo-testaceous; the legs palest;
the scape fuscous, with its base pale; the head large, wider than the
abdomen, and emarginate behind; the clypeus and mandibles obscurely
ferruginous. Thorax compressed, not strangulated in the middle. The
scale of the petiole narrow, with its margin rounded above; abdomen
ovate, and sprinkled with a few erect pale hairs.

_Hab._ Aru.

12. FORMICA SCRUTATOR. F. nigerrima, mandibulis tarsorumque articulo
apicali pallide ferrugineis, thorace medio profunde coarctato.

_Worker._ Length 1-1/2--2 lines. Shining black; the mandibles pale,
ferruginous, with their inner margins finely denticulate; the eyes
placed rather forwards on the sides of the head, the latter emarginate
behind. Thorax deeply strangulated in the middle; the metathorax
elevated and obliquely truncate behind. Abdomen ovate; the scale of the
petiole sub-incrassate, with its margin rounded above; the insect very
thinly covered with a fine cinereous pile.

_Hab._ Aru.

13. FORMICA ANGULATA. F. nigra nitida; flagello capite antice pedibusque
obscure ferrugineis, metathorace angulato.

_Worker._ Length 3 lines. Shining black; head of moderate size; the
clypeus and mandibles obscure ferruginous; the flagellum
fusco-ferruginous, with the tip pale testaceous. Thorax rounded
anteriorly and compressed behind; the scutellum prominent, forming a
small tubercle; the metathorax obliquely truncate, the margin of the
truncation elevated, so that when viewed sideways the metathorax forms
an obtuse angular shape. Abdomen ovate, the node of the peduncle
elevated, incrassate, rounded anteriorly, and flat behind.

_Hab._ Aru.

Gen. POLYRHACHIS, _Smith_.

1. Formica sericata, _Guer. Voy. Coq. Zool._ ii. 203; _Atlas Ins._ pl.
8. f. 2, 2 _a_, _b_, _c_, _d_, [Symbol: Mercury]. (Polyrhachis sericata,
_Smith, Append. Cat. Form._ p. 200.)

_Hab._ Aru; New Hebrides.

2. Formica sexspinosa, _Latr. Hist. Nat. Fourm._ p. 126, pl. iv. f. 21
[Symbol: Mercury]. (Polyrhachis sexspinosa, _Smith, Cat. Form._ p. 56.