176 Transactions SoiitJi African Fliilosojjhical Society, [vol. xii. 



Cephalic horn-; having a long peduncle, moderately 

 divaricating at the tip, and deeply emarginate at the 

 base ; prothorax punctulate, retuso (pi. xxxv., fig. 31) emeritus. 



Cephalic horn, triangular at base, bi-furcate at tip . . criicifer. 



Cephalic horns fitting against two impressions in 

 the anterior part of the prothorax, which is lobate 

 in the middle, and has a median longituditial furrow 

 (pi. xxxv., fig. 38) huhalus. 



Cephalic horns vertical, curving slightly inwardly and 

 united at base by a tri-dentato carina ; prothorax 

 punctate, retuse (x)l. xxxv., fig. 36) inter stitialis. 



Cephalic horns sub-vertical ; prothorax impressed on 



each side, and closely granular (pi, xxxv., fig. 84) . . 7irus. 



Cephalic horns sub- vertical ; prothorax deeply ex- 

 cavate in the middle, and closely punctate (pi. xxxv., 

 fig. 37) vitulus. 



Cephalic horns vertical, slender ; prothorax slightly 

 impressed in the anterior part ; prothorax and elytra 

 very shagreened ; pygidium clothed with a dense, 

 greyish white pubescence (pi. xxxv., fig. 39) . . . . tenuicornis. 



C'. Head with two horns. 



(t\ Cephalic horns long, recumbent or slanting backwards. 



Cephalic horns not reaching the base of the prothorax, 

 not broadly divaricating, bifid at tip ; prothorax 

 deeply excavate and having a long, compressed 

 median horn projecting sub-horizontally from the 

 top of the anterior declivity (pi. xxxv., fig. 12) . . . . iiyramidatis. 



Cephalic horns divaricating, not reaching the base of 

 the prothorax, truncate at tip, and having at base, in 

 the centre of the carina, a moderately long, com- 

 pressed horn, bifid at tip and directed backward ; 

 prothorax deeply excavate, and having in the centre 

 at apex a diagonal, moderately long, compressed, 

 laminate horn, also bifid at tip (pi. xxxv., fig. 11).. i^cmopliis. 



Cephalic horns very short and situated in the outer 

 part of a very narrow horse-shoe shaped carina ; pro- 

 thorax bi-impressed longitudinally in front, not retuse 

 and with a slight median, longitudinal carina , , . . obtusus. 



Cephalic horns crescent-shaped ; prothorax excavate 

 in front and either quadri-dentate in the anterior 

 part, or with the median part projecting and recurved 

 (pi. xxxv., fig. 1) corniculatus. 



a"'. Cephalic horns tuberculiform ; prothorax not im- 

 pressed in front. 



