158 M. Louis Peringuey on new genera and S2)ccies of 



directed backwards ; prothorax punctulate — in the $ broadly and 

 deeply excavated from the apex to the base, with the walls of the 

 excavation retuse, and produced in the anterior part in a conical 

 tubercle on each side a little higher than the clypeal horn, 

 posterior part of the excavation semi-circular — in the ? with 

 a faint median impression in the anterior part ; elytra convex, 

 grooved along the suture and the outer margins, but without any 

 trace of dorsal strife, closely punctured, the punctures almost 

 superficial. Length 10-10^, width 6-6^ mm. 



Hah. Zambezia (between Limpopo and Zambeze Rivers). 



A little larger and more massive than 0. meleagris, 

 with the clypeal horn much longer, the prothorax more 

 broadly and deeply excavated, and the anterior part of 

 the wall produced in a longer and sharper tubercle. 



0. mashunns, n. sp. 



Piceous-black, shining ; head and clypeus smooth, $ with 

 a short, sharp horn in the centre of the head ; prothorax closely 

 punctured laterally, smooth along the base, excavated in the 

 anterior part, the excavation sub-elongate, quadrate, shallow, with 

 the anterior edge only slightly raised, and hardly aculeate past the 

 median part, between the posterior part of the excavation and the 

 base there is also a shallow median impression ; elytra moderately 

 convex, and on a plane with the ridges of the prothoracic 

 excavation, grooved along the suture and the outer margins, striate 

 from the suture to the median part of each wing-cover, punctured, 

 the punctures shallow but well-defined ; underside piceous-red. 

 Length 10, width 6 mm. 



Distinct from both 0. zambezianus and 0, meleagris 

 in having the cephalic horn in the middle of the head ; 

 the shape of the prothoracic excavation is also different, 

 and the elytra are striate in the median part. 



Hah. Zambezia (Salisbury). 



0. ovamijoanus, n. sp. 



Piceous-black, shining, head with a short sharp horn; prothorax 

 punctulate in the ^ , excavated in the anterior part, the excava- 

 tion shallow and with a deeper median impression, the ridges of the 

 excavation hardly raised, and straight to the median part, the 

 posterior part of the excavation, which reaches only the median 

 part of the disk, rounded ; in the $ the prothorax is only slightly 



