1900.] Catalogue of the Colcoptera of South Africa. 345 



Median lobe moderately broad, nearly straight, only 



slightly eniarginate in the centre, dorsal part smooth, ^ 



lateral horns of prothorax moderately long . . . . cajgensis. 



Median lobe broad, slightly tri-sinuate, dorsal part 

 deeply punctured, lateral horns of prothorax very 

 long (pi, xxxiii., fig. 14) anceus. 



a^. Median part of thorax bi-lobate. 



Median lobe broadly incised and bluntly bifid on 

 each side, median, sloping anterior part with a small 

 tubercle in the centre, a lateral, marginal tooth on 

 each side (pi. xxxiii., figs. 15, 19) eljphenor. 



Median part of lobe produced in a long, bifid process 

 slightly dented inwardly at tip, no marginal tooth on 

 each side jacchus. 



Median lobe arcuate, quadri-dentate, lateral part of 



excavation strongly dentate at apex ; elytra very \ 



globose glohulipennis. I 



A-. Prothorax very sloping in the anterior part and not excavate ' L- "^ 

 laterally. 

 B. Males with a cephalic horn. 

 O^. Cephalic horn not laminate at base, and cylindrical at tip. 

 D?. Apical spurs of anterior tibiae curving slightly out- 

 wards. 



Cephalic horn ensiform and with a very distinct 

 median compressed tooth behind ; proth6rax with 

 two more or less strongly developed, diverging horns 

 beginning at a short distance from the base (pi. xxxiii., 

 figs. 2, 2a) cornifrojis. 



a^. Prothorax very deeply excavated longitudinally in the 

 centre, cephalic horn curved and hamate behind. 



Cephalic horn with a basal hook behind, clypeus 

 smooth, intervals of elytra covered with deep, very 

 closely set punctures (pi. xxxiii., fig. 7) plutus. 



Cephalic horn with a sub-median hook behind ; 

 clypeus as closely punctured as the rest of the 

 head ; intervals of elytra covered with deep, very 

 closely set punctures mesacanthus. 



Cephalic horn with a sub-median tooth behind ; 

 clypeus and head punctured ; prothorax very deeply 

 excavate, and with the sides of the excavation pro- 

 duced in front as two conspicuous horns on each side ; 

 elytra opaque; intervals impunctate (pi. xxxiii., 

 fig. 5) bootes. 



Cephalic horn short, thick at base, sharply curved ; 

 prothorax deeply excavate, walls of excavation not 

 dentate, truncate at apex, elytra shining . . . . excavatus. \ 



