BY REV. T. BLACKBURN. 495 



priated female that seems likely to be referable to it. The female 

 was unknown to Harold. I feel no doubt but that it should be 

 placed in the group with multicarinate hind tibiae. 



B, CAVicoLLE, Macl, 



The author of this species was mistaken as to its female, which 

 he says has a short unarmed frontal horn, and on either side of 

 the retuse front of the pronotum a tubercle. These are all the 

 particulars he supplies. I believe the specimen on which he 

 founded the description to have been the male of another species. 

 I have before me female examples of a Eolboceras which the cir- 

 cumstances of capture conclusively identify with this species. 

 They can be at once separated from the females of all the other 

 species known to me (of the group with multicarinate hind tibiae) 

 by the piece of the head which I have called the frontal wing 

 being very much below the plane of the f rons, the sides of which 

 fall vertically to the inner end of the frontal wings, their lateral 

 vertical face being quite half as high as the length of the frontal 

 wings from their inner to their outer apex. The frontal elevation 

 is much like that of B. rhinoceros, Macl. (female), in respect of 

 height and the bifidity of its apex, but is more laminiform in 

 shape owing to the presence of a carina connecting the apex of 

 the frontal elevation with the apex of each of the two lateral 

 arese of the clypeus, which in this species (owing to the presence 

 of an additional carina simulating a continuance of the clypeal 

 elevation) appear to be distinct from and behind the clypeal 

 elevation, and, in fact, not to be parts of the piece that I have 

 called the clypeus. The pronotum has no tubercles on the sides 

 of the retuse front, and differs very little from that of B. rhino- 

 ce7'0s, except in the transverse carina above the retuse front being 

 less strongly cariniform and much less extended laterally, and in 

 the puncturation of the non-retuse parts being closer and more 

 extended. The presence of a well-defined 6th external tooth on 

 the front tibise is a conspicuous character of this species ver}'- 

 unusual in this group of Bolbocerata. The sides of the pronotum 

 are finely serrulate in both sexes. 



