498 REVISIOX OF THE AUSTRALIAN SPECIES OF BOLBOCERAS, 



It is a member of the group with multicarinate hind tibise. The 

 male is remarkable by the great length of its frontal horn, sur- 

 passing that of any other Bolboceras known to me; and also by 

 the curious sculpture of the excavation of its pronotum, on the 

 floor of which there is a sharply cut deep sulcus running from 

 the front to behind the middle and causing the remainder of the 

 excavated portion, when looked at obliquely from in front, to 

 present a considerable resemblance in form to a horseshoe. Some 

 other particulars regarding it are indicated by its place in the 

 tabulation. The female that I pair with it is from the same 

 locality and agrees with the male in size and colour, and also in 

 two unusual characters, viz., the wide interval between the two 

 fovea) on the front margin of the pronotum (which is more than 

 twice as wide as the distance of either fovea from the lateral 

 margin) and in the presence of a fovea within the humeral angle 

 of the elytra, the angle itself being markedly less rounded off 

 than in most Bolbocerata. The sculpture of the pronotum is 

 throughout much like that of B. ungulicoriie (female) described 

 above (except in the much greater distance from each other of 

 the foveee on the front margin); but the retuse space on the front 

 is evidently wider and consequently more transverse, and has 

 only very fine puncturation and a very small number of larger 

 punctures in the extero-posterior portion, and the puncturation 

 of the non-retuse portion of the surface does not increase so 

 markedly in closeness and fineness from the middle towards the 



sides. 



B. RHINOCEROS, Macl. 



The male of this species has been recognisably described by its 

 author, and somewhat fully by Harold. Neither of those authors, 

 however, refers to its multicarinate hind tibij«. Harold did not 

 know the female, and Macleay's description of it does not dis- 

 tinguish it from the females of other species of the same group. 

 I have before me several examples of the female, one of which 

 was sent to me (along with a male) by the captor as being 

 certainly conspecific with the male accompanying it. These 

 females are extremely like the same sex of the species that I 



