506 REVISION OF THE AUSTRALIAN SPECIES OF BOLBOCERAS, 



B. LACUNOSUM, Macl. 



Only the male of this species has been described. It was taken 

 near Sydney, and is evidently a member of Group ii., but the 

 description is too brief to enable me to place it in either Sub- 

 group. 



B. DENTICOLLE, Macl. 



Taken by the Mitchell Expedition in the far North, is known 

 only by the male. It is evidently a member of the First Subgroup 

 of Group ii. 



B. INGENS, Macl. 



Is known only by a male example from the far North of W. Aus- 

 tralia. I should judge it to be a member of the First Subgroup of 

 Group ii. 



B. QUADRICORNE, Klug. 



I have not seen the original description of this species. 

 Westwood, however, quotes Klug's description, which (as quoted 

 by Westwood, who states that he has not seen the insect) appears 

 to me to be identical with B. serricoUe, Bainbridge, and Westwood 

 states that serricolle is identical with frontale, Guer. Klug's 

 description, it should be noted, is too brief for confident identi- 

 fication. 



B. FissicoRXE, Bainb. 



Is stated by Westwood to be a variety of the male of B. recti- 

 corne, Guer. { = hastifer, Bainb.). I am convinced that this is an 

 error, and that Bainbridge's description was founded on the 

 female of a species quite distinct from rect'icorne, of which I have 

 both sexes before me. Its male differs from that of recticorne 

 chiefly by the middle of the clypeal elevation being a horn which 

 is (not erect but) directed obliquely forward, by the left mandible 

 (viewed from above) having an extremely strong sinuation on 

 its external margin, by the horn of its pronotum springing from 

 immediately behind the front margin of the segment and project- 

 ing horizontally over the head, b}^ the retuse part of the pro- 

 notum coarsely and deeply punctulate on its lateral parts, and 

 by the much narrower and deeper excavation of the retuse front 



