279 



No doubt he considered the bicarinate (instead of multi- 

 carinat-e) hind tibiae as of more importance than the foveae. 



BOLBOCERAS FRONTALE, Guer. 



I have not seen the descriptions and figure of this species 

 by Guerin and Klug, but a specimen sent from the British- 

 Museum, as compared with the type of frontale, is certainly 

 a male of zerricolle (given as a synonym of frontale) , and the 

 sexes of which were correctly described by Bainbridge. Many 

 mated pairs of the species were taken at Beverley by the late 

 Mr. F. H. du Boulay ; of these the male usually has the 

 prothoracic horns almost equilaterally triangular, but varying 

 till combined they are but little more than a notched trans- 

 verse ridge, as on some females; some males, on the other 

 hand, have the horns porrect and much more acute. The 

 elevations on the head also vary in size, but the deep pro- 

 thoracic excavations are always very conspicuous on the 

 males. 



BOLBOCERAS CARPENTARIAE, Macl. 



This species occurs in several parts of Northern Queens- 

 land and of the Northern Territory, and is variable in size 

 and sculpture. On the typical form the prothoracic horns 

 are small, and arise from an almost evenly convex surface ; 

 the front margin of the prothorax has two small, deep foveae, 

 and the hind tibiae are multicarinate ; the cephalic horn is 

 about as long as the space between the eyes. The extreme 

 form of the species has the cephalic horn much longer (fully 

 twice the width of the Lead), the prothorax with the horns 

 longer (almost the width of the head), and the space behind 

 same obliquely flattened instead cf evenly convex. I am unable 

 to distinguish its female from the female of cornir/enim., and 

 several males before me seem to be connecting links between 

 the two species. 



BOLBOCERAS TRITUBERCULATUM, Baillb. 



The female figured by Westwood as belonging to this 

 species was incorrectly identified. There are in the Museum 

 several specimens of both sexes, sent (mated) by the late Mr. 

 F. H. du Boulay from Beverley. The female differs from 

 the male in having two small subcontiouous tubercles on the 

 middle of the head, the prothorax non-tuberculate, and with 

 two transverse curved carinae not quite enclosing a somewhat 

 elliptic space, the hind one of which is much more distant 

 from the base than that of the male. The specimen he figured 

 (figs. 6, a and h) as septemtuberculatiim is quite evidently 

 not that species, and probably was a slight female variety of 

 trituberculatum. 



