1904.] Catalogue of the Colcoptera of South Africa. 265 



the clypeus, which is shorter, has strongly reflexed margins, and is 

 deeply emarginate in the centre ; prothorax slightly sinuate in the 

 anterior part, ampliated laterally at about the median, somewhat 

 moderately convex, covered with very closely set, deep, round 

 punctures which are separated from each other by a space narrower 

 than their own diameter, the outer margin is reflexed and strongly 

 serrate from the anterior angle to the median part, but carinate 

 thence to the sharp basal angle, and the anterior is briefly hairy in 

 the centre ; scutellum ogival, somewhat short, closely and deeply 

 punctate ; elytra ampliated laterally from about the median part, 

 not very convex, somewhat retuse behind, plainly tri-costate on 

 each side and with the suture also plainly raised, the whole surface 

 is covered with nearly confluent, deep punctures, giving to the elytra 

 a very coriaceous appearance ; propygidium and pygidium very 

 closely punctured, the latter somewhat convex, glabrous along the 

 edges except for a few short setae at the apex ; abdomen closely 

 punctulate, glabrous. 



Length 18-20 mm. ; width 9-J-ll mm. 



The genital armature of the male is strikingly different from that 

 of any of the South African Melolonthince. 



Hab. Southern Ehodesia (Sebakwe). 



Gen. PSILONYCHUS, Burm., 

 Handb. d. Entom., iv., 2, p. 288. 



Mentum quadrate, entirely fused with the ligular part, which is, 

 however, so reduced in length that the labial palpi are inserted on 

 the angles of the anterior part, which is straight, not emarginate; 

 ;second joint of the labial palpi thick, last joint short, ovate, but 

 ;sub-acuminate at tip ; maxillae robust and with a quadrifid, strong 

 tooth at the tip and two simple teeth underneath, maxillary palpi 

 moderately long, last joint fusiform, not impressed laterally ; 

 mandibles very robust, arcuate ; labrum vertical, not deeply emar- 

 ginate, head small, narrower than the clypeus and without a clypeal 

 suture, or with only a faint one, clypeus more or less deeply 

 emarginate in the centre and with the margins slightly reflexed ; 

 eyes moderately large ; antennae 9- or 10-jointed, club usually tri- 

 jointed, but occasionally 4-jointed, long in the male, ovate in the 

 female, the two last joints of the pedicel more or less compressed ; 

 prothorax moderately convex, either sub-aculeate or ampliated 

 laterally in the middle according to the sexes, and equally attenuated 

 thence towards the sharp anterior angle as it is towards the base 

 the angle of which is not much pronounced, in the centre is a more 



