144 Transactions South African Philosophical Society, [vol. xii. 



thirds of the length, and there deeply smuate, marginate all round, 

 very convex, havmg a distinct, although not deep, median longitu- 

 dinal furrow, covered with closely set scabrose punctures turning to 

 fine granules laterally and in and near the two basal impressions 

 which are elongate and parallel ; scutellum almost invisible ; elytra 

 somewhat convex, slightly sinuate laterally a little before the median 

 part, humeral callus extending only on the seventh and sixth stri^, 

 striae fine, intervals slightly aciculate and slightly coriaceous at 

 times ; pygidium with a few minute granules ; metasternum closely 

 granular except in the centre, which is very slightly carinate. 



Male : Head aculeate, but not as sharply as in the female ; 

 anterior tibiae a little bent at base, nearly straight, strongly quadri- 

 dentate outwardly, mucro thin, sharp, diagonal, underneath there 

 is a very strong somewhat serrate lamina, aculeate, or ending in a 

 small tooth at tip, and a much longer and vertical one at base in a 

 line with the outer basal tooth (fig. 4a) ; anterior femora with a 

 strong tooth on the upper margin near the knee, and another and 

 sharper one at about the middle of the low^er margin ; intermediate 

 femora broadly grooved underneath, sinuate and deeply incised at 

 apex, where there is a curved tooth, while each side of the sub-apical 

 groove is also dentate, the intermediate tibiae are very slender for 

 one-third of the length and from there incurved at a very sharp 

 angle, and broadly dilated ; posterior femora with a sharp, broad 

 lamina developed into a long sharp curved tooth directed towards the 

 knee, the remaining part of the femur broadly grooved underneath 

 (fig. 4) and dentate on each side at apex ; posterior tibise also very 

 slender at base for about one-third of the length, and from there 

 curved, but not quite so sharply as the intermediate one, and dilated 

 in an elongato-quadrate thick lamina. 



Female : Clypeus very long, somewhat rostrate ; punctures and 

 granules on the prothorax deeper and more closely set ; legs very 

 robust. 



Length 16-27 mm. ; width 10-14 mm. 



The insects which I identified as 0. curvipes answer completely 

 to the careful description of Lansberge, except that the anterior 

 tibiae are normally dentate outwardly. Yet in one of my examples 

 two of the basal teeth are nearly wanting, worn out in fact, and it 

 is quite possible that the same thing had occurred in the examples 

 made use of by Lansberge for his description. 



This species is very closely allied indeed to 0. uncinatus, Klug, 

 but it is more massive, more convex ; the clypeus in the female is 

 decidedly rostrate, and in the male the upper carina of the anterior 

 tibiae becomes rounded towards the apex and seldom edges the inner 



