132 MAMMALIA. 



SYNOPSIS OF GENERA OF STREPSICER^. 



I. Limbs equal. African. 



a. Nose cervine. Neck with a linear mane. 



1. STREPSICEROS. Horns spiral, keeled. 



2. OREAS. Horns straight, with a spiral keel. 



b. Nose bovine. Neck with long hair. 



3. TRAGELAPHUS. Horns subtriangular, subspiral. 



II. Hinder legs short. Asiatic. 



4. PORTAX. Horns short, subtriangular. 



I. The African Genera have large heavy horns, only the rudi- 

 ment of a tear-bag, and the limbs nearly equal. Skull with 

 " the nasal opening of moderate size ; a suborbital fissure, but 

 no fossa ; the masseteric ridge not extending high ; the auditory 

 bulla swollen and prominent ; the basioccipital bone with its an- 

 terior and posterior pairs of tubercles well developed, the former 

 separated by a deep median groove; the median incisors ex- 

 panded at their summits; the molars without supplemental 

 lobes." Turner. 



Strepsiceros, Turner, P. Z. S. 1850. 

 Antilope et Damalis, part., H. Smith. 

 Sylvicaprina, Sundevall, Pecora. 



A. Horns with strong spiral keel. Nose cervine, hairy. Muffle 

 small, between and under the front half of the nostrils. Body 

 large, heavy. Neck maned. 



1. STREPSICEROS. 



Horns large, heavy, spirally twisted, with a distinct, raised, 

 rounded keel in front. Tear-bag a naked space. Throat with a 

 central linear mane. Females hornless. (Skull, t. 17. f. 1, 2.) 



Damalis Strepsiceros, H. Smith, Griffith A. K. v. , 182. 

 Strepsiceros, Gray, Ann. fy Mag. N. H. 1846, 230; Turner, P. 



Z. S. 1850. 



Boselaphus, Lesson, Nov. Tab. R. A. 181, 1842. 

 Risia, Laurill. 

 Calliope, sp., Ogitby. 



