352 Transactions South African Philosophical Society, [vol. xiii. 



Some of the species included in this genus, such as A. rusticus, 

 germari, variabilis, have fossorial habits ; in those the upper spur 

 of the hind tibiae of the $ is more compressed and slightly blunter 

 than in the others. When the basal joint of the hind tarsi is greatly 

 produced outwardly, the same joint of the median tarsi and even 

 the second are also similarly produced although in a lesser degree ; 

 the other species seem to be floricolous, and in these the basal joint 

 of the hind tarsus is gradually reduced and becomes even quite 

 normal (A. tomentosus). 



Kraatz has founded the sub-genus Sisyraphora for A. tomentosus, 

 which certainly differs from the other species in the vestiture, the 

 shape of the clypeus, and of the hind tarsi, and the sub-genus Xeloma 

 for A. ocliosus, which differs also not only in the shape of the clypeus 

 but the sculpture approximates greatly that of the genus Pseudo- 

 protaetia with which it forms an undoubted link, although Pseitdo- 

 protaetia belongs to another group of Cetonidaa according to my 

 arrangement of the same. The differences of the genus Diathermies, 

 also of the same author, are more specific than generic. Odonto- 

 thyrea, Schoch., is merely distinguished by the two median teeth 

 of the clypeus projecting beyond the other two, which are thus 

 almost sub-lateral. 



Key to the Species. 



A5. Basal joints of intermediate and hind tarsi spinose outwardly. 



a 2 . Clypeus weakly quadri-dentate. 



Hind spurs almost as long as the four basal joints taken 



together rusticus. 



a 1 . Clypeus strongly quadri-dentate. 



Hind spurs not as long as the four basal joints taken 

 together germari. 



A 4 . Basal joint of hind tarsi ending in a long hamate tooth out- 

 wardly. 



Clypeus bi-dentate variabilis. 



A3. Basal joint of hind tarsi spinose only outwardly. 



Clypeus sharply acuminate, deeply emarginate in the centre 

 and with the outer angles upturned. 



Prothorax strongly sloping laterally in front odiosus. 



Prothorax ampliated laterally from near the apex mashunus. 



Clypeus quadri-dentate, the two median teeth louger than the 



lateral figuratus. 



A 2 . Basal joint of hind tarsi angular only outwardly. 



Clypeus sharply quadri-dentate, the teeth of equal size . . . . globosus. 



