he scape short, not longer
than the second joint of the flagellum. Thorax: the scutellum prominent,
forming a rounded tubercle, the metathorax elongate and oblique. Abdomen
aciculate as in the worker, but much more deeply strangulated between
the first and second segments; the petiole rugose and clavate.

_Hab._ Aru.

Gen. ODONTOMACHUS, _Latr._

1. Odontomachus simillimus, _Smith, Cat. Form._ p. 80. 11 [Symbol:
female].

_Hab._ Aru. Ceylon.

2. ODONTOMACHUS TYRANNICUS. _O._ capite thoraceque nigris, antennis
abdomineque ferrugineis, margine interno mandibulorum serratulo.

_Worker._ Length 7 lines. Head oblong, narrowed behind, posteriorly
deeply emarginate; the mandibles rufo-piceous, brightest at their apex,
which is armed with two long teeth which are bent abruptly inwards,
their tips black; the anterior portion of the head striated obliquely
from the centre; the head, behind the anterior sulcation, very smooth
and shining and having a deep longitudinal central depression. Thorax
transversely striated, the articulations of the legs and the tarsi
ferruginous. Abdomen smooth, shining, and ferruginous; the node of the
petiole incrassate, cylindric, and tapering upwards into a very acute
spine.

_Hab._ Aru.

3. ODONTOMACHUS MALIGNUS. _O._ ferrugineus; capite supra oblique
striato; margine interno mandibulorum confertim serrato; metathorace
transversim striato; squama unispinosa; abdomine laevissimo.

_Worker._ Length 7 lines. Ferruginous; the flagellum and legs palest;
head much narrowed behind, the posterior margin deeply emarginate;
mandibles smooth and shining, their inner margin strongly serrated,
their apex abruptly bent or elbowed, and armed with two stout teeth; the
face anteriorly evenly striated obliquely; the head behind the anterior
sulcation very delicately striated obliquely. The prothorax smooth and
shining, the meso- and metathorax transversely striated. Abdomen very
smooth and shining; the node of the petiole incrassate and tapering
upwards into an acute spine.

_Hab._ Aru.

This species most closely resembles _O. maxillaris_ from Brazil; but
its smooth polished prothorax alone would distinguish it; its head is
much broader anteriorly, and less elongate.

Gen. PSEUDOMYRMA, _Guer._

1. PSEUDOMYRMA LAEVICEPS. _P._ nigra, laevis et nitida; antennis,
mandibulis, tibiis anterioribus, tarsisque rufo-fulvis.

_Worker._ Length 2-1/4 lines. Black and shining; head very smooth and
slightly emarg