1900.] Catalogue of the ColcojJtcra of South Africa. 325 



Key to the Species. 



A^. Anterior tibise oblique inwardly at tip and non-spinose. 



B3. Prothorax, not excavate, more or less abruptly truncate 



and more or less sharply carinate at the upper part of 



the declivity. 



C^ Cephalic horn compressed, and situated in the anterior 



part of the head. 



Anterior part of prothorax nearly vertical, carina as 



broad as the thorax, and sharply angular laterally . . i^latycerus. 



Carina bi-sinuate in the middle, dentate above the 

 lateral impression, and produced in a long, aculeate 

 process (pi. xxxii., fig. 10) hradsliawi. 



Anterior part of prothorax excavate, carina conspicu- 

 ously sinuate laterally, sharply angular at end, outer 

 side with a strong angular process in front of the 

 terminal end of the carina rhinoceros. 



0^ Cephalic horn more or less conical, and not situated in 

 the anterior part of the head. 



Anterior part of prothorax slightly impressed laterally 

 carina slightly arcuate at middle, denticulate and pro- 

 duced obliquely for a short distance into a very sharp 

 ridge beginning with a short, sharp tooth (pi. xxxii., 

 fig. 9) heros. 



Anterior part of prothorax impressed but not excavate, 

 carina emarginate at centre, flexuose laterally, and 

 having on each side under the carina a sub-lateral 

 furrow edged by a sinuate smaller ridge disseptus. 



Carina with three emarginations in the centre, with 

 the angles of each emargination produced into a short 

 tooth ; the two central teeth are longer than the sub- 

 lateral ones (pi. xxxiii., fig. 11) ulysses. 



Carina emarginate at centre, and having a short, sharp, 

 ^ sub-lateral tooth, cephalic horn compressed at base 



(pi. xxxiii,, fig. 25) pylades. 



B^. Prothorax not excavate, not very abruptly truncate at 

 apex, and having two long, diverging horns in the centre. 



The two processes long and diverging much ; cephalic 



horn nearly erect (pi. xxxiii., fig. 13) tricornutiis. 



The two processes long and diverging much ; cephalic 

 horn directed forward in a sub-horizontal direction 

 (pi. xxxiii., fig. 20) vitulus. 



Cephalic horn very long, straight for two-thirds of the 

 length, and curving slightly backwards towards the tip 

 (pi. xxxiii., figs. 23, 24) laticeps. 



