280 



BOLBOCERAS PONTIFERUM, Blackb. 



A specimen from Western Australia in the National 

 Museum agrees perfect!}'' with the type in the tubercles and 

 excavations of the prothorax, but has the cephalic horn much 

 longer (about thrice as long as the distance between the eyes) 

 and with its tip conspicuously forked. 



BOLBOCERAS ARMIGERUM, Mad. 



A specimen from Queensland, in. the National Museum, 

 apparently belongs to this species, but has the median 

 tubercles of the pronotum slightly closer together and stouter 

 than usual, with the cejuialic horns very different, the median 

 one being- much longer than usual and the lateral ones some- 

 what shorter ; the lower front angles of the prothorax are also 

 much more acute. Fig. 43, pi. xxxiii., is of the normal form, 

 44 of the variety. 



Bolboceras VARioLicoLLE, Lea, var. ( ?) 



A specimen from Queensland (Maranoa) in the National 

 Museum is somewhat smaller (15 mm.) than the type of 

 variolicolle, and has the prothoracic margins much less con- 

 spicuously serrated, the ocular canthi smaller, with their 

 outer angles rounded off, the middle and lateral areas of the 

 clypeus confused together owing to the absence of internal 

 boundary lines, the frontal elevation consisting of a longer 

 and not semi-double horn, and the front face of the clypeus 

 much less elevated. Judged by their heads alone, this 

 specimen and the type of variolicolle would appear to belong- 

 to two species, but the four processes on the pronotum of 

 each are so closely in agreement that, knowing but one 

 specimen of each, and allowing for the very considerable 

 variation that occurs on the heads of many species, it does 

 not appear desirable to describe the Maranoa specimen as 

 new. A figure (pi. xxxiii., fig. 45) of the front view of tire 

 clypeus is given for comparison with that of the type (Proc. 

 Linn. Soc, N.S. Wales, 1915, pi. xlviii., fig. 2). 



Bolboceras insigne, n. sp. 

 PI. xxxiii., figs. 46 and 17. 



^ . Bright castaneous. Under-snrface densely clothed, 

 lower portion of cephalic horn with a few straggling hairs. 



flcdd with a long and suberect horn, its base and the 

 clypeus with dense but rather shallow punctures ; canthi 

 concave; mandibles with a subtriangular extension near apex. 

 Prot hora. r with a large medio-frontal excavation, curvi- 

 linearly deepened at each side, a moderately long, curved 



