146 ^MITH ON HYMENOPTEEA OF ARTT ISLANDS. 



hind; longitudiDally striated, the striae diverging from the centre at 

 the anterior ocelhis ; at half the distance between the posterior ocelli 

 and the margin of the vertex the striae are transverse. Thorax smooth 

 and shining, with scattered fulvous hairs ; the wings fusco-hyaline, 

 with a dark fuscous stain occupying the marginal cell and traversing 

 the course of all the nervures ; the legs with the femora much incras- 

 sated, the posterior pair compressed beneath into a flattened process 

 or keel. Abdomen ovate, smooth, shining, and with a scattered ful- 

 vous pubescence ; the first node of the petiole rounded in front, nar- 

 rowed and truncate behind, with a large compressed tooth beneath ; 

 the second node subglobose. 



Worker major. Length 4 Hnes. 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. fcrruginca; capite thoraceque longi- 

 tudinaliter striatis, femoribus vald^ 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 L^viFRONS. P. obscure fcrruginca ; capite abdomi- 

 neque laevissimis lucidisque ; thorace longitudinaliter striate ; femori- 

 bus medio valde incrassatis, basi tenuissimis. 



Worker. Length 2i hnes. 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 



