277 



Victoria, and King and Flinders Islands. In both sexes (51) 

 the antennae have the second to seventh joints flat and 

 strongly triangularly dilated, and the eleventh joint appar- 

 ently divided into two (on many specimens the antennae 

 appear to be truly twelve- jointed). The pronotum varies to a 

 slight extent in comparative width, both sexually and indi- 

 vidually, < 32 ) and has a large irregular depression towards each 

 side, and a sub triangular medio- basal one ; the latter is 

 bounded by two ridges that meet or almost meet about the 

 middle, and these were used by Blackburn as the main 

 dividing feature of the genus: — "A. Prothorax having two 

 ridges, which diverge obliquely hindward from the middle of the 

 median line enclosing a triangular depression (antennae uni- 

 colorous)." < 33 ) In the figure by Champion the triangular space 

 is rather too sharply defined, however. Blackburn referred 

 three species to A, but I am convinced that all the specimens 

 he so referred (these presumably are in the South Australian 

 Museum and now before me), and all others before me that 

 would be referred to A, belong to but one species. 



In commenting upon luctuosus as a distinct species (but 

 with elytra varying as those of haemorrhoidalis) Blackburn 

 attached considerable importance to the basal joint of the hind 

 tarsi being "invariably whitish-testaceous" ; but the specimens 

 before me vary from those having the basal joint entirely 

 black to those having its base conspicuously pale (sometimes 

 almost white) ; the clothing of the base also varies as its sup- 

 porting portion. 



A. Prothorax entirely black. 



haemorrhoidalis, Fab. (typical). Entirely black except 

 that the tips of the elytra are reddish (the reddish portion 

 may be evenly curved or slightly encroached upon by the 

 black tips of the elevated lines). This, although the typical 

 form of the species, is rather rare ; one specimen has the red 

 advanced along the outer margins half-way to the base, but 

 not along the suture ; it was standing in the Blackburn col- 

 lection with specimens of marginatus. 



Var. atratus, Guer. (luctuosus, Boisd.). An entirely 

 black form (except that there is the usual variation in colour 



(3D The subapical segment of the abdomen is conspicuously 

 notched in the middle of its apex in the male. 



(32) The prothorax is slightly longer in the male than in the 

 female, but its length appears to alter on specimens according as 

 to whether these have the prothorax closely applied to or partly 

 free from the head and elytra; but usually the smaller specimens 

 are narrower and with the prothorax less transverse than in the 

 larger ones. 



(33) The antennae are not always unicolorous, the lower parts 

 of the three basal joints being sometimes pale. 



