1900.] Catalogue of the Coleoptera of South Africa. 223 



and has the margm recurved, the genge are sometimes a Httle 

 rounded and sub-auriculate in the great development of the male, 

 and there is a frontal carina which, however, disappears sometimes ; 

 prothorax ampliate laterally, distinctly marginate all round, retuse 

 in front in both sexes, and covered with fine, very closely set 

 scabrose punctures, turning to minute granules on the sides ; elytra 

 ovate, narrowly striate, striae not distinctly geminate, intervals 

 plane and entirely filled with very closely set, minute setigerous 

 punctures, second interval broader than the third ; pygidium very 

 closely punctured and clothed with a long, dense pubescence ; 

 metasternum punctulate in the median part, except for a narrow, 

 smooth, longitudinal space in which the impressed line is not very 

 distinct, inner part of anterior tibiae briefly spinose in the male, 

 apical spur long and nearly straight in both sexes. 



Male : Vertex of the head either produced at the base into two 

 compressed horns which are vertical for half the length and then 

 curve outwardly and upwardly and have no trace of transverse 

 basal carina, or having a median, not much raised, transverse 

 carina the ends of which project on each side in the shape of a 

 curved, compressed horn ; prothorax deeply excavate in the anterior 

 part, and having a horizontal, compressed lamina projecting from 

 the centre of the anterior part and emarginate at tip ; in the smaller 

 development this median process of the anterior part of the pro- 

 thorax is more in the shape of a slightly projecting, transverse, 

 sub-arcuate ridge, and the lateral cavities have a very distinct tooth 

 or tubercle outwardly. 



Female : Frontal carina hardly visible, vertex with a high trans- 

 verse ridge extending from eye to eye, and bent diagonally at right 

 angles above the eye as far as the base ; in the large development 

 this lateral carina is sharply dentate, and even produced into a 

 distinct, vertical horn, very much as in the minor development of 

 the male. 



The armature of the head of the male and even of the female 

 differs so much that had I not seen a large number of examples of 

 this species, I would still consider my 0. haroldi as different from 

 0. corniculatus . 0. verticalis, Fahr., is an intermediate develop- 

 ment. 



Length 6-9-|- mm. ; width 4-5 mm. 



Hab. Natal (Estcourt), Transvaal (Potchefstroom, Eustenburg), 

 Southern Rhodesia (Victoria Falls, Middle Limpopo), Ovampoland 

 (Omrromba). 



It was originally described from Abyssinia. 



