188 Transactions South African PhUosoiMcal Society, [vol. xii. 



of the head is closely granulose, there is no clypeal carina, and in 

 the posterior part of the head there is a very long, slender curved 

 horn, sub-triangular at base, compressed for half the length and 

 sub-cylindrical from there to the tip ; prothorax ampliate and mar- 

 ginate laterally, but not along the base which is distinctly triangular 

 and somewhat sharply produced in the middle, it is very closely 

 granular, sub-retuse in front, has a very well-defined longitudinal 

 median sulcus reaching from base to apex, and a deep elongate, 

 smooth impression on each side above the basal, rounded angle ; 

 elytra ainpliato-ovate, slightly geminato-striate with all the intervals 

 plane and filled with very closely set setigerous punctures, second 

 interval broader than the third ; pygidium covered with deep, nearly 

 confluent punctures ; anterior tibiae truncate, straight at tip, 

 strongly spinose inwardly, apical spur sub-cylindrical, curving slightly 

 outwards. 



Female unknown. 



Length 7 mm. ; width 4 mm. 



A very distinct species, which could only be mistaken owing to the 

 colour of the elytra for 0. prcestans and 0. trinodosus, which have 

 also some small round spots on the flavous elytra; but 0. prastans, 

 which is more closely related than 0. trinodosus, has the apical 

 spurs of the anterior tibite thickened and incurved in the male and 

 two prothoracic tubercles entirely wanting in 0. stenocerus, while 

 O. trinodosus, in which the spurs of the anterior tibiae are similar to 

 those of 0. stenocerus, has also two distinct, prothoracic tubercles. 



I have only seen one of Fahroeus' co-type labelled " Caffraria." 



Onthophagus impkessicollis, Bohem., 



Plate XXXV., flg. 24. 



Ofvers. Vet. Ak. Forh., 1860, p. 112. 



O. aviabili.s, Pering., Trans. S. Afric. Phil. Soc, vi., 1892, p. 29. 

 5 0. (jcmmcus, Paring., Trans. Entom. Soc. Lond., 1896, p. 157. 



Head and prothorax metallic green, moderately shining, densely 

 pubescent ; elytra flavescent and having the suture dark cyaneous 

 blue and an arcuate band of the same colour reaching from shoulder 

 to shoulder ; under side blue-black ; pygidium covered with a very 

 dense silky white pubescence ; gente straight, clypeus rounded 

 laterally and with the apical part straight transversely, it 

 is distinctly plicate, and the frontal part scabroso-punctate ; 

 antennae flavous ; prothorax ampliate, marginate laterally and in 

 front, but not very distinctly along the base the median part of 



