1900.] Catalogue of the Coleoptera of South Africa 539 



This species varies very much in size, but the frontal carina of the 

 male is always deeply incised, the incision being rounded at base, 

 and the walls straight ; it is easily distinguished from the other 

 South African species by the prothoracic cavity of the male which 

 extends nearly on the whole of the median discoidal part, even in 

 small examples, and also by the distinctly striate and punctate elytra. 

 In small specimens found in the Worcester and Paarl districts these 

 striae and also the punctures are somewhat obliterated, the punctures 

 especially ; in fact it may be said that the examples from the western 

 parts of the Cape Colony have the elytra less punctate than those 

 from elsewhere. 



Length 21-26 mm. ; w^idth ll-lSJ mm. 



Hah. Cape Colony (Stellenbosch, Paarl, V/orcester, Prieska, Car- 

 narvon, Graham's Town), Natal (Durban, Frere, Estcourt), Trans- 

 vaal (Johannesburg, Potchefstroom), Southern Ehodesia (Manica, 

 Buluwayo), Damaraland (Otjimbingwe). 



Gen. PYCHNOSCHEMA, Thoms., 



Plate XL., fig. 22. 



Archiv. Entom., ii., 1858, p. 65. 



Mentum triangular or conical laterally, and produced into a long 

 sharp point at apex, distinctly concave in the median part, and with 

 the concavity hidden by a bunch of dense hairs, apical joint of labial 

 palpi sub-ensiform, very long, deeply grooved externally, rounded at 

 tip, apical lobe of maxillae very small, horny, oblong, bristly, but 

 non-dentate, last joint of maxillary palpi curved like that of the 

 labial, but a little longer, and also grooved outwardly for nearly half 

 the length ; mandibles semicircular, concave and showing strongly 

 owing to the clypeus being reduced to a narrow triangular ledge 

 recurved at tip ; genae transversely lobate, narrow, projecting beyond 

 the eyes ; head with a distinct incurved horn in the male, or a high 

 transverse sub-tuberculate carina in the female ; prothorax diagonally 

 attenuate laterally in front and a little ampliate in the middle, mar- 

 ginate all round except in the centre of the base which is distinctly 

 sinuate, the posterior angles are sharp ; the anterior part of the 

 disk is excavated in the male and sometimes bi- or quadri-tuberculate 

 in the posterior margin, in the female the prothorax is simple ; 

 elytra as broad as the prothorax at the base, distinctly ampliate 

 laterally past the middle, moderately convex or even somewhat 

 plane (P. corydon), not very callous behind, more or less deeply 

 punctulate and with two duplicate regular series of punctures more 



