170 



lightly curved, then strongly dilated with the apex truncate. 

 Prothorax subquadrate, front angles rounded off; with a large 

 median fovea from base to near apex; basal half granulate, 

 apical half punctate. Elytra with dense and moderately strong 

 punctures, becoming smaller posteriorly; subsutural striae 

 distinct. Abdomen with a wide and deep excavation at base 

 of upper-surface, the excavation semicircularly encroaching 

 upon middle of convex portion ; its under-surf ace strongly 

 incurved from apex to base. Met (internum ridged along 

 middle, the ridge terminating near apex in a small acute 

 tooth. Front tibiae with a feeble tooth near inner apex; 

 middle femora stouter than the others ; trochanters strongly 

 dentate, tibiae with a small outer tooth near middle, and a 

 narrow flange at the outer apex, inner apex with an acute 

 tooth almost in line with the flange ; hind legs thinner than 

 the others and unarmed. Length 2-2'25 mm. 



9 . Differs in having the under-surface of abdomen 

 convex, and the metasternum and legs unarmed. 



Hab. — Victoria: Eltham, in nests of ants under stones, 

 July and August, 1918 (P. E. Wilson). Type, I. 10627. 



One of the most distinct species in the genus. In my 

 table it would be associated with .4. hamatipes, on account of 

 the middle tibiae, but the armature is very different : on that 

 species it consists of a conspicuous dentiform flange about the 

 middle, on this species there is a small median tooth, but the 

 apex is armed both internally and externally; the tooth of 

 the front tibiae is feeble and invisible from most directions, 

 it is also partly concealed by clothing. The fascicles on the 

 upper-surface of the abdomen are rather larger than usual, 

 and on its under-surface there are some small, median ones 

 that from some directions look like small teeth. The two 

 minute black spots between the eyes are fairly distinct ; 

 similar spots may be traced on most species of the genus. The 

 only female examined has been returned to Mr. Wilson, 

 together with one of the males. 



Articerus mesosternalis, n. sp. 

 PI. xxv., figs. 7 and 8. 



o 7 . Rather dark castaneous, disk of elytra somewhat 

 paler. Clothing as described in subcylindricornis; 



Head moderately long and (except for eyes) almost 

 parallel-sided, densely granulate. Antennae rather thin and 

 cylindrical, circular in transverse section, apical portion 

 slightly dilated and truncate. Prothorax subquadrate, front 

 angles rounded off; with a comparatively small and narrow 

 medio-basal fovea : granules as on head, but punctate about 

 apex. Elytra densely punctate; subsutural striae distinct. 



