202 Transactions South African PliilosopJiical Socictij. [vol. xii. 



not much ovate, geminato-striate with the intervals plane and filled 

 with moderately dense setigerous pmictm-es, second interval very 

 little broader than the third, humeral callus not very prominent ; 

 pygidium very closely punctate; metasternum punctulate but with 

 a median longitudinal smooth space ; inner part of anterior tibise 

 sharp but not spinose, apical spurs long, and curving slightly 

 outward in both sexes. 



Male : Cephalic horn short, compressed and triangular at base 

 and from there cylindrical and slightly sharp at tip {quadrinodosus) 

 or quadrate at base and truncate {truncaticornis) . 



Female : Vertex with a broad transverse laminate carina instead 

 of a horn, the prothorax is also quadri-tuberculate as in the male, 

 but the anterior part is a little more sloping. 



Length 8-9-|- mm. ; width 4|^-5 mm. 



Hah. Natal (Durban), N'Gamiland, teste Boheman. 



Onthophagus opacus, Fahr., 

 Insect. Caffrar., ii., p. 292. 



Black, opaque, very briefly pubescent ; head and prothorax some- 

 times with a slight aeneous tinge ; antennae piceous, club fuscous ; 

 head roughly punctured on the clypeus, and having a few scattered 

 punctures on the vertex, frontal carina distinct, arcuate, clypeus 

 semicircular, not deeply emarginate at tip, genae rounded ; pro- 

 thorax ampliate and rounded laterally, very little convex, but a 

 little retuse in front, marginate all round, rounded at base, having 

 an impressed median longitudinal line in the posterior part of the 

 disk, and covered with round, deep, contiguous, ver}^ briefly seti- 

 gerous punctures ; elytra very little ampliate, sub-elongato-ovate, 

 narrowly geminato-striate, striae deeply punctured and shining, 

 intervals plane and having each a double series of more or less 

 regularly arranged, deep, briefly setigerous punctures except near 

 the base where the punctures are more numerous, second interval 

 hardly wider than the third, humeral callus distinct ; inner part of 

 anterior tibiae non-spinose at tip ; apical spur nearly straight, 

 moderately slender. 



Male: Vertex with a conical tubercle, a small tooth, or a triangular 

 vertical horn not reaching quite the height of the apical part of the 

 prothorax which is a little retuse in front and has no tubercle at the 

 tip, or is retuse in front and bi-tuberculate at tip, the tubercles being 

 set close to one another. 



Female: Vertex with a sub-median, short, transverse carina; pro- 



