CEPHALOPHIN^ 61 



The following is a key to the 33 numbered species of the 

 genus here recognised (some only provisionally) : — 



A. Horns (usually absent in female) directed upwards 



and backwards to form an obtuse angle with 



plane of face ; ears relatively long and pointed. G. grimini, lq- 



cluding G. leucoprosopus, of which 

 the right to distinction is not clear. 



B. Horns (usually present in female) directed back- 



wards in plane of face ; ears medium or short, 



rounded. 



a'. Size large ; length of hind-foot (excluding 



hoof) more than 11 inches, or 280 mm. ; 



basal length of skull exceeding 9J inches 



(240 mm.). 



a. General colour blackish, with triangular 



black patch on loins G. sylvicultrix. 



h. General colour grey on body and black on 



head and neck G . j entinhi. 



b'. Size medium or small; length of hind-foot 

 (exclusive of hoof) not exceeding lOJ inches 

 (260 mm.) ; basal length of skull not more 

 than about 8| inches, or 220 mm. 

 a''. Inguinal glands present. 



a. Hind-quarters transversely banded G. clorice. 



h. Hind-quarters not transversely banded, 

 a'. Hair on part of nape directed forwards. 

 a'. A black blaze on face. 



a^. Body-hair short and close C. iveynsi. 



h^. Body-hair hicker and more woolly ; 



colour darker 0. johnstoni. 



V. No black on face G.hroohei. 



a''. Hair of nape directed uniformly back- 

 wards. 

 a?. Colour tawny, rufous, or chestnut, 

 a*. Colour uniform, no face-blaze. 



aP. Size larger G. spadix. 



V. Size smaller ; length of hind-foot, 

 without hoof, 7| inches (193 

 mm.). 



a^. Some black in crest G. natalensis. 



&*. Crest wholly red or orange ... C. centralis. 

 6*. Dark markings on face or back, or 

 on both. 

 a'. Darker markings shiny black or 

 brown. 

 a*. Back rufous, no dorsal stripe, 

 a'. Colour dark chestnut above 



and below G. nigrifrons. 



fe^. Colour deeper and richer. 



a'°. Chin white C. ruhidus. 



b^". Chin dark G. cla/adA,. 



