BY REV. T. BLACKBURN. ' 499 



regard as B. neglectum, Westw. (described above under B. cornu- 

 ttim, Macl.); indeed, the only definite character I can specify for 

 distinguishing it from that insect is the presence of an extremely 

 strong sinuation on the external margin of the left mandible and 

 the somewhat greater distance towards the sublateral fovea of 

 the pronotum, to which the extremity of the transverse carina of 

 the pronotum is extended on either side. Male specimens 

 differing from the ordinary form of this species in having the 

 horns of the head and pronotum shorter — the latter, moreover, 

 less compressed and at the apex not bifid — I regard as a variety. 



B. NEGLECTUM, Westw. 



Remarks on this insect will be found (above) under B. cornu- 

 tum, Macl. 



B. CORNIGERUM, Macl. 



The male of this species is extremely close to that of B. cavi- 

 colle, Macl. Their author distinguishes the latter from the former 

 by the presence of a tooth on the hind surface of the frontal horn. 

 Varieties of the former, however, have a more or less defined 

 tooth. B. cavicolle does not seem to be variable; its horn is com- 

 paratively short and laminiform with a very strong tooth (much 

 stronger than in any cornigerum that I have seen), but there is 

 a reliable distinction between the two species in the notably 

 shorter and wider tibise of cavicolle. The females are so readily dis- 

 tinguishable by the structure of the frontal wings and other 

 cephalic characters (see B. cavicolle, supra) that there can be no 

 doubt of the validity of the species. The presence of a more or 

 less distinct 6th external (the uppermost) tooth in both sexes on 

 the front tibise of cavicolle is a distinctive character, but it must 

 be noted that this tooth is in some examples feebly defined. As 

 the female of cornigerum has not hitherto been recognisably 

 described, I add sonie notes on it. It is very distinct from cavi- 

 colle by its frontal wings being on a plane continuous with that 

 of the frons and by the absence of carime connecting the summit 

 of the frontal elevation with the postero-external angles of the 

 lateral clypeal arese. The retuse front of its pronotum is wider 



