_Worker major._ Length 4 lines. Ferruginous, entirely smooth and shining; the thorax, legs, and abdomen more or less obscure, the femora being usually rufo-piceous; the mandibles striated with their margins black. Thorax nearly flat above, very slightly convex with the sides margined, the anterior margin slightly rounded, the lateral angles produced into small acute spines; a deep strangulation at the base of the metathorax, a little before which the lateral margins are produced into an angular tooth, the metathorax with two short acute spines; the femora thickly incrassate. Abdomen ovate. _Hab._ Aru. 2. PODOMYRMA STRIATA. _P._ ferruginea; capite thoraceque longitudinaliter striatis, femoribus valde incrassatis, basi tenuissimis. _Worker._ Length 3 lines. Rufo-ferruginous with the abdomen obscure, becoming blackish at the apex, the head coarsely striated, with a central portion from the insertion of the antennae to the hinder margin of the vertex delicately so; the mandibles striated, with the teeth on their inner margin black. Thorax rugose-striate, the anterior lateral angles dentate, the metathorax without spines; the femora thickly incrassate and greatly attenuated at their base. Abdomen ovate, smooth and shining; the nodes of the petiole rugose. _Hab._ Aru. This species resembles _P. femorata_, but is easily distinguished by its striated head and thorax; the latter is similarly flattened above and margined at the sides; the femora are also thickened precisely as in that species. 3. PODOMYRMA LAEVIFRONS. _P._ obscure ferruginea; capite abdomineque laevissimis lucidisque; thorace longitudinaliter striato; femoribus medio valde incrassatis, basi tenuissimis. _Worker._ Length 2-1/2 lines. Head and abdomen smooth, shining black, in some examples fusco-ferruginous; the antennae, legs, and thorax ferruginous, the latter longitudinally striated; the thorax margined at the sides, the disk slightly convex, the anterior margin slightly rounded, with the lateral angles armed with short acute spines, the thorax deeply strangulated posteriorly, the metathorax not spined; the femora thickly swollen in the middle and very slender at their base and apex. Abdomen ovate, the first node of the petiole oblong, the second globose. _Hab._ Aru. There is considerable variation in intensity of colouring in examples of this species, the thorax and legs being sometimes pale ferruginous; in the specimen described they are dark; every shade of gradation occurs in different individuals. 4. PODOMYRMA BASALIS. _P._ fusco-ferruginea; abdominis basi pallide testacea; femoribus medio incrassatis, basi tenuibus.