inOO.J Catalogue of the CoIro])tem. of SoutJi Africa. 77 



or four very distinct anterior teeth ; antennto normal ; prothorax 

 convex, rounded and serrulate laterally ; elytra rotund ; pygidium 

 somewhat inflexed ; intermediate coxt.D almost contiguous ; anterior 

 tihitJO 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 tibias and tarsi provided 

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

 vided with claws. 



The habits of Pachysoma are the same as those of Scarabceus ; they 

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

 their balls in daytime. 



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

 in P. hippocratcs, marginatum and f7c»//co//(', 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. hi'ppocrates, which 

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

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



The shape of the genital armature of P. asculapius, hippocrates and 

 (JenticoUe, is the same, but that of M. marginatum differs sensibly. 



Keij to the Species. 

 A3. Cl3'peus bi-dentatc. 



Anterior and lateral part of prothorax covered with closely 

 set granules ; anterior tibiss not serrate inwardly in either 

 sex; elytra feebly costulate (esc7ila]pius. 



Anterior tibiae dilated inwardly at tip in the <? . 



Whole surface of prothorax closely and deeply punctate ; 



elytra not costulate liippocratca. 



Prothorax set with yery distinct scattered granules, elytra 

 distinctly costate ; anterior tibiae mucronate at tip in the 

 (? , and with a series of five distinct teeth inwardly . . . . marginatum. 



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



External teeth of the anterior tibiae truncate at tip schinzi. 



A'. Clypeus quadri-dentatc in front. 



Prothorax closely foveate and with a median lozenge- 

 shaped deep impression and a diagonal one on each side: 

 anterior tibiae denticulate inwai'dly and bi-mucronate at 

 tip in the male clenticolle. 



