1900.] Catalogue of the Goleoptera of South Africa. 77 



or four very distinct anterior teeth ; antennae normal ; prothorax 

 convex, rounded and serrulate laterally ; elytra rotund ; pygidium 

 somewhat inflexed ; intermediate coxae almost contiguous ; anterior 

 tibiae quadri-dentate outwardly, and distinctly serrate from the digita- 

 tion to the base ; intermediate and posterior ones strongly bi-dentate 

 outwardly, and bi-mucronate at tip ; posterior tibiae and tarsi provided 

 with long, fasciculate hairs ; posterior and intermediate tarsi pro- 

 vided with claw^. 



The habits of Pacliysoma are the same as those of Scavahceus ; they 

 are, however, far from being as common as the latter ; they work at 

 their balls in daytime. 



While in one species, P. cBSCulajnus, there is no sexual difference, 

 in P. hi2Jj)0crates, marginatum and denticolle, the anterior tibiae of the 

 male and sometimes the posterior ones are {marginatum) incurved at 

 tip, and laminate, mucronate, or distinctly dentate inwardly. 



The genus numbers six species, of which I have seen four. The 

 identity of one, however, P. striatum, Cast., seems to me to be very 

 doubtful, and I feel rather inclined to think that Castelnau's very short 

 description was made from a small example of P. JiijJ^^ocrates , which 

 is the only species with a punctulate prothordbc. (Fairmaire does not 

 mention the sculpture of the prothorax of P. scJiinzi in his description.) 



The shape of the genital armature of P. cesculajntis, hijjj^ocrates and 

 denticolle, is the same, but that of M. m argina tuvi di&ers sensibly. 



Kejj to the Sjpecics. 

 A3. Clypeus bi-dentate. 



Anterior and lateral part of prothorax covered with closely 

 set granules ; anterior tibise not serrate inwardly in either 

 sex ; elytra feebly costulate cesculapms. 



Anterior tibiae dilated inwardly at tip in the c? . 



Whole surface of prothorax closely and deeply punctate ; 



elytra not costulate liippocratcs. 



Prothorax set with very distinct scattered granules, elytra 

 distinctly costate ; anterior tibiae mucronate at tip in the 

 S , and with a series of five distinct teeth inwardly . . . . mai'ginatuin. 



A^. Clypeus with two bi-lobate anterior processes. 



External teeth of the anterior tibiae truncate at tip schinzi. 



A^ Clypeus quadri-dentate in front. 



Prothorax. closely foveate and with a median lozenge- ^ . 

 shaped deep impression and ti diagonal one on each side; 

 anterior tibiae denticulate inwardly and bi-mucronate at 

 tip in the male denticolle. 



