1907.] Catalogue of the Coleoptera of South Africa. 527 



on each side of the disk, and a broader sub-quadrate one in the 

 centre, and covered with round, cicatricose foveolate punctures ; 

 scutellum punctulate in the same manner ; elytra with two distinct 

 dorsal costae on each side, the inner one less conspicuous than the 

 other, the two broad spaces between the suture and the outer costa 

 are filled with greatly elongated, non-contiguous cicatricose punc- 

 tures, the walls of which form an irregular duplicate strigillation, the 

 deflexed part is roughly punctate ; pygidium transversely swollen in 

 the centre in the male, simple in the female, roughly punctate ; 

 under side and legs roughly punctate ; joints of anterior tarsi more 

 nodose than in any other of the congeneric forms. 



Length 10-11 mm. ; width 4| mm. 



Hab. Transvaal (Potchefstroom). 



This species has been met by Guienzius in a formicarium, in 

 Natal. 



Gen. GENUCHUS, Kirby, 

 Trans. Linn. Soc, xiv., 1825, p. 569. 



Mentum parallel, straight in front with the outer angles moderately 

 rounded, strongly swollen on the outer face of what should be the 

 ligular part, with the lower portion of the inflated part projecting 

 behind as a broadly conical vertical process overhanging the base 

 of the mentum ; upper lobe of maxillae with a long, sharp tooth very 

 slightly bent at the tip, inner lobe thickly pubescent and armed with 

 a short, straight tooth bluntly acuminate inwardly ; last joint of 

 labial and maxillary palps cylindrical ; first antennal joint greatly 

 dilated and compressed ; head strongly deflexed, highly carinate at its 

 junction with the clypeus and with the median part of the keel 

 triangular, frontal part impressed and with a blunt occipital keel, 

 clypeus quite vertical and with the anterior part porrect and 

 emarginate ; prothorax ampliate rounded laterally or not, not 

 marginate and with the posterior angles broadly rounded; scutellum 

 long, very sharply acuminate ; elytra with the sides parallel, broader 

 or as broad as the prothorax, bi-costate on each side in the South 

 African species ; pygidium large, transversely convex in the middle ; 

 under side roughly punctate ; prosternum with a very short ante- 

 coxal sub-conical tubercle penicillate at tip, and a post-coxal small 

 or large vertical tubercle ; anterior tibiae tri-dentate outwardly, the 

 upper tooth far removed from the other two ; joints of anterior tarsi 

 sub-nodose, the others increasing in width at apex, claws moderately 

 long and curved ; anterior and posterior tibiae, bi-dentate on the 

 upper side. 



The form of the mentum and also that of the clypeus is certainly 



