1908.] Catalogue of the Coleoptera of South Africa. 643 



short, retuse part is weakly furrowed, and smooth on each side of 

 the furrow, the surface is very sparingly punctured for two-thirds 

 of the length, the punctures being shallow and sub-equidistant, the 

 posterior third is impunctate, and in the centre there is a very 

 shallow groove, along the base is a series of fine, closely set punc- 

 tures ; scutellum impunctate ; elytra deeply and narrowly punctate 

 striate, the intervals plane and impunctate ; abdomen not distinctly 

 punctate ; femora smooth ; anterior tibiae seven-dentate. 



Length 10 mm. ; width 6J mm. 



Hab. Southern Rhodesia (Sebakwe). 



This species is easily distinguished from the other South African 

 species of the seven-dentate anterior tibiae section by the armature 

 of the head and the weak and very remote punctures of the prothorax. 



BOLBOCERAS MATABELE, n. Sp. 



This species might at first sight be taken for B. exasperans, but 

 the anterior tibiae are 7- instead of 6-dentate ; the head is trans- 

 versely striate punctate, and instead of the tubercle in the anterior 

 part being in a line with the point of insertion of the antennae it is 

 set more forward and is very small ; in the anterior part of the pro- 

 thorax there is a moderately deep, obtusely triangular impression 

 similar to that of B: exasperans, but the punctures on the sides are 

 much more remote than in that species ; elytra closely and deeply 

 punctate-striate. 



Length 8 \ mm. ; width 5 mm. 



Hab. Southern Rhodesia (Plumtree). 



This species is closely allied to B. consocium, which it should 

 follow, and from which it differs mainly by the much more remote 

 punctures on the sides and centre of the prothorax. 



BOLBOCERAS AMBIGUUM, n. Sp. 



Male : Brick-red, shiny, clothed underneath with long fulvous 

 hairs ; head darker red, deeply and somewhat closely punctate 

 in the frontal part, but rugosely coriaceous on the clypeus which 

 is plainly carinate in front, in the centre of the frontal part and in a 

 line with the eyes is a very short transverse ridge ; prothorax not 

 excavated or impressed in the anterior part, but having a very faint 

 median longitudinal groove in the posterior, and covered with equi- 

 distant, or nearly equi-distant round punctures separated by an 

 interval wider than their diameter, in the centre of the base there 

 is a small, smooth area ; scutellum closely punctate ; elytra deeply 

 and closely punctate striate, intervals smooth, the three juxta- 



42 



