1900.] Catalogue of the Colcoptcva of South Africa. 221 



Onthoi'hac.us tenuicoknis, Klug, 

 Plate XXXY., fig. 39. 



Monatsb. Berl. Ac, 1855, p. 654; Peters' Eeis., 18G2, p. 23G. 



0. chalcostomm, Fahr., Insect. Caffrav., ii., p. 310. 

 Sub-coppery bronze, or l)ronze green, moderately sliining, l)riefly 

 pubescent, but tbe pygidium is clothed with a dense, conspicuous, 

 silky ^Yhite pubescence ; head roughly punctured, genae rounded, 

 clypeus rounded, but blunt at tip and very slightly emarginat© 

 there, frontal carina very faint in the male but distinct in the female ; 

 antennae piceous red, club fuscous ; prothorax moderately convex,, 

 declivous in the anterior part, ampliate laterally, slightly marginate 

 along the base which is rounded, distinctly depressed longitudinally 

 in the middle in the posterior part, and covered with deep punctures 

 set very close and separated from one another l)y rugose walls; 

 elytra moderately ampliato-ovate, narrowly but deeply punctato- 

 striate, intervals plane and filled with three series of irregular, 

 nearly confluent, foveolate punctures which are very briefly 

 setigerous, second interval not wider than the third, humeral callus 

 not very prominent ; pygidium very closely punctulate and densely 

 pubescent ; under side very pubescent ; metasternum closely punc- 

 tured, median longitudinal impressed Hne not distinct; inner part of 

 anterior tibioB not spinose at tip, apical spur nearly straight. 



Male : Vertex produced into two long vertical horns compressed 

 laterally, and varying greatly in length. They may reach higher 

 than the apex of the prothorax or be reduced to a mere conical 

 tubercle ; the prothorax is sloping in the anterior side, and more or 

 less deeply impressed in the centre of the slope according to the 

 development of the cephalic horns. 



Female : Vertex produced in a transverse sub-basal, slightly 

 arcuate high lamina the angles of which, in the great development, 

 are sometimes produced in a moderately long horn ; prothorax 

 with a median, sub-quadrate, shining tubercle on the top of the 

 anterior declivity. 



Length 5-9 mm. ;; width 3-5 mm. 



Hah. Natal (Durban, Estcourt, Frere, Maritzburg) ; Cape 

 Colony (Griqualand West, Somerset East) ; Transvaal (Rus- 

 tenburg) ; Southern Rhodesia (Salisbury) ; Mozambique (Rikatla). 



Onthophagus obtusus, Frihr., 

 Insect. Caffrar., ii., p. 313. 

 Black, but slightly metallic, moderately shining, almost glabrous, 

 elvtra chesnut-bronze, very feebly pubescent ; antennae ferruginous. 



