169 



than elsewhere ; a few hairs on abdomen, and a conspicuous 

 fascicle on each side of base of its upper-surface, its excavated 

 portion glabrous. 



Head rather stout and finely granulate, with a vague 

 median line; with a short subtriangular projection from 

 mouth. Antennae not much longer than head, feebly dilated 

 from near base to apex, circular in transverse section. 

 Prothorax subquadrate, front angles rounded off, with a fairly 

 large top-shaped fovea, surface granulate as head. Elytra 

 densely and finely punctate; subsutural striae distinct. 

 Abdomen with a wide and deep excavation at base of 

 upper-surface, the excavation widely and shallowly encroach- 

 ing on middle of convex portion; its under-surface incurved 

 from apex to base, apex strongly encroached upon by pygidium, 

 which is foveate. Frost ernum with a conspicuous median keel 

 between apex and coxae. Metasternum unarmed. Femora 

 moderately stout, unarmed ; front trochanters feebly dentate ; 

 tibiae thickened at apex, the middle ones feebly produced at 

 inner apex. Length, 2-2'25 mm. 



9 . Differs in having slightly shorter antennae, under- 

 surface of abdomen evenly convex, the pygidium non-foveate, 

 metasternum less depressed posteriorly, its clothing no denser 

 than elsewhere, and the legs unarmed. 



Hab. — Western Australia: Swan River, many specimens 

 from nests of Iridomyrmex conifera (J. S. Clark). Type, 

 I. 10626. 



In size and general appearance somewhat resembling A. 

 cylindricornis, but there are many differences of the head, 

 under-surface, and legs, the antennae are shorter and stouter, 

 and are feebly dilated from the base to the apex. The meta- 

 sternum of the male is flattened and somewhat depressed 

 posteriorly, its dense clothing causes the flat space to appear 

 conspicuously triangular, and at each corner of the base of 

 the triangle there is a feeble fascicle that has the appearance of 

 a small tooth. The feeble armature of the legs (confined to 

 the middle tibiae and front trochanters) is very unusual in 

 the males of Artie erus. 



Articerus wilsoni, n. sp. 

 PI. xxv., figs. 5 and 6. 

 d ■ Castaneous, some parts slightly darker than others, 

 basal half of antennae darker than apical half. Clothing as 

 described in preceding species. 



Head very short, part in front of eyes slightly wider than 

 long, a shallow depression in middle between eyes, on each side 

 of which is a minute black elevation; surface finely granulate. 

 Antennae circular in transverse-section, basal half narrow and 



