BY REV. T. BLACKBURN. 497 



by Macleay. The only remark Macleay makes on the female is 

 that it has "a small bifid tubercle on the forehead and no tubercle 

 on the thorax," which is the case with all its congeners of this 

 group. I am disposed to think that cornutum, is the male of 

 B. neglextum, Westw. I have before me two females from the 

 Port Essington region which (on account of their locality, size, 

 colour and agreement with Westwood's unsatisfactory brief 

 description) are probably Westwood's species. My reason for 

 associating them with B. cornutum is that various other species 

 of the Port Essington region extend their habitat to the parts 

 traversed by the Calvert Expedition and from which B, cornutum 

 was obtained, that they belong to the same group of Bolbocerata, 

 and that they have in comparison with most of the other females 

 of the group, as cornutum has in comparison with the males, a 

 somewhat large portion of the pronotum devoid of puncturation. 

 This is, of course, not sufficient evidence to justify the sujDpres- 

 sion of cornutum as a valid name without further investigation. 

 The most conspicuous character of these females consists in the 

 form of the retuse front of their pronotum, the floor of which is 

 nearly flat, on a plane considerably lower than that of the 

 adjacent parts, and with nearly straight limits laterally, the 

 surface on either side of the retuse part dropping down to its 

 level subvertically, so that the lateral limits of the retuse part 

 have from a certain point of view the appearance of almost 

 straight even furrows, each ending in front with one of the two 

 deep round fovete that in this group of Bolbocerata are observed 

 on the front margin of the pronotum. The transverse carina of 

 the pronotum is sinuous with its extremities bent (not forward 

 but) hindward in a line that if continued would run into the 

 middle of the sublateral fovea of the pronotum. The external 

 outline of the left mandible, viewed from above, is scarcely 

 sinuate. 



B. HiPPOPUS, Macl. 



Only the male of this species has been described hitherto. 

 There is a male Bolboceras in the S. A. Museum and a female in 

 my own collection which I have no hesitation in referring to it. 



