This species is at first sight very like the _P. geometrica_ from Singapore; but the striation of the abdomen alone will serve to distinguish it. 3. PONERA PARALLELA. _P._ nigra, opaca; antennis, mandibulis, pedibus abdominisque apice ferrugineis. _Worker._ Length 3-1/4 lines. Opake black; the antennae thick and scarcely as long as the thorax, their apex and the mandibles bright ferruginous; the legs somewhat obscure ferruginous, with the articulations much brighter; the head a little wider than the thorax and subovate; the thorax, node of the petiole, and the abdomen of nearly equal width, the abdomen being slightly the widest; the node of the petiole nearly quadrate; the apical margin of the first segment and base of the second slightly depressed. _Hab._ Aru. 4. PONERA QUADRIDENTATA. _P._ atro-fusca; antennis, facie antice, antennis, mandibulis, tibiis tarsisque ferrugineis; alis subhyalinis. _Female._ Length 3-1/2 lines. Nigro-fuscous; the antennae with a carina between their base, the face anteriorly, the mandibles, the legs, and the abdomen at its apex and beneath, ferruginous; the femora and coxae above, fuscous; the head subquadrate with the angles rounded; the eyes small and placed forwards on the sides of the head towards the base of the mandibles, the latter with four strong teeth on their inner margin. Thorax oblong-ovate with the metathorax truncate; the wings fusco-hyaline, the stigma large and black. Abdomen: the second segment slightly narrowed at its base, the node of the petiole incrassate and compressed, its upper margin rounded. The insect entirely covered with a short downy cinereous pile, the abdomen having also a number of scattered erect glittering hairs. _Hab._ Aru. Gen. ECTATOMMA, _Smith_. 1. ECTATOMMA RUGOSA. _E._ fusco-brunnea; capite, thorace, nodoque rugosis; abdomine delicatule aciculato. _Worker._ Length 4 lines. Obscure fusco-ferruginous, the antennae and legs bright ferruginous; the head, thorax, and node of the petiole coarsely rugose; the eyes very prominent and glassy; the mandibles longitudinally but very delicately striated, their inner margin edentate; the thorax slightly narrowed behind. Abdomen very delicately aciculate. _Male._ Length 3-1/2 lines. Of the same colour, and sculptured like the worker; the head rounded behind the eyes and narrowed before them; the eyes very large, prominent and ovate; the ocelli very bright and prominent; antennae elongate and slender, the 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.