253 



tibiae somewhat dilated at apex, the former with a small 

 apical spine, middle pair with an acute apical hook. Length, 

 l| mm. 



9 . Differs in being somewhat wider posteriorly, antennae 

 shorter, and (as viewed from the sides) somewhat stouter, 

 under-surface of abdomen evenly convex, not grooved, and 

 metasternum and tibiae unarmed. 



Hab. — North-western Australia: Fortescue River, from 

 nests of a small species of Iridomyrmex (W. D. Dodd). Type, 

 I. 8539. 



Not very close to any other species known to me ; 

 brevipes (also from North-western Australia) is a shorter 

 species, with less conspicuous prothoracic fovea, and with 

 abdomen, legs, clothing, etc., different. The clothing of most 

 of the upper-surface is so short that it appears almost like 

 very small scales, but the elytra have a conspicuous apical 

 fringe of short spines; the male has a short spine projecting 

 from the mouth. The antennae of the male are lightly curved, 

 viewed from above they appear to be almost parallel-sided 

 from near the base to the truncated apex, but from the sides 

 each appears to be rather thin on the basal half, and then 

 evenly and rather strongly dilated ; from some directions 

 they seem to be finely longitudinally striated, but this is 

 really due to the arrangement of the granules. From an 

 oblique direction the widest part of the prothorax appears to 

 be quite angular. From the sides, and in a rather poor 

 light, the under-surface of the abdomen of the male appears 

 to have an acute spine, but in a good light and from an 

 oblique direction this is seen to be due to two erect setae, 

 close together, but one on each side of the median groove. 



Articerus coelogaster, n. sp. 



$ . Dark castaneous-brown ; elytra, upper-surface of 

 abdomen, and appendages somewhat paler. Clothed with 

 very short pubescence, becoming more conspicuous and golden 

 about apex of elytra, upper-surface of abdomen with a few 

 erect setae about sides and apex, and with a small fascicle 

 on each side of base. 



Head short, wide, and deep, without median line; 

 punctures dense and rather coarse. Antennae short and wide. 

 Prothorax lightly transverse, front angles rounded off; with 

 a feeble medio-basal depression; punctures as on head. 

 Elytra moderately dilated posteriorly, subsutural striae 

 lightly defined ; base with dense and moderately coarse 

 punctures, smaller and sparser (but distinct) elsewhere. 

 Upper-surface of abdomen with a short deep excavation, not 

 encroaching upon the convex portion; under-surface with a 



