494 REVISION OF THE AUSTRALIAN SPECIES OF BOLBOCERAS, 



to each other. The male is readily distinguishable from all the 

 other described males of the group having the hind tibiae multi- 

 carinate (except B. cavicoUe, Macl.), by its frontal horn having 

 a tooth on its hind face slightly above the middle; and from cavi- 

 coUe, inter alia midta, by its front tibise having only 5 external 

 teeth. Its frons (which is represented b}' the front face of the 

 frontal horn) and clypeus are entirely vertical, so that (the speci- 

 men being viewed from the side) the clypeal elevation is seen to 

 project horizontally. The female referred to above has the upper 

 outline of the retuse front of its pronotum, though perfectly 

 well defined, yet less cariniform than in any other female Bolbo- 

 ceras known to me of this group; indeed, it is not strictly carini- 

 form at all. This defined outline does not occupy transversely 

 more than the middle one-third of the pronotum, but it is arched 

 forward at its extremities and continues on either side of the 

 retuse front almost to the front margin of the segment without 

 becoming less clearly defined. The retuse front is extremely nitid, 

 but bears sparse lightly impressed somewhat close and not parti- 

 cularly fine punctures. On the non-retuse part of the pronotum 

 there is a median very coarsely punctulate wide longitudinal 

 impression, on either side of which is a scarcely punctulate space, 

 the rest of the surface, except close to the base, being closely 

 punctulate (gradually more coarsely and less closely from the 

 sides towards the middle. Its head does not difi'er noticeably 

 from that of B. 7'hinoceros, Macl. (female). The striation of its 

 elytra (as in the male) is feebler than that of rhinoceros, but the 

 striae are more conspicuously and less coarsely punctulate than in 

 B. rhinoceros (as is also the case with the male). 



B. Albertisi, Har. 



I have not seen any specimen that I can attribute to this 

 species, which is stated by its author to be remarkable by a longi- 

 tudinal carina on the lower part of the front face of the frontal 

 horn of its male. This character seems to me likely to be reliably 

 specific, but I have before me specimens that do not ditter from 

 the description very widely in other respects. I have no unappro- 



