Zoological Society. 417 



ters assigned to his StrepsicerecB agree with the Nyl-Ghau, and not 

 with the others, which certainly have no suborbital sinus, nor have 

 any of them an ovine muzzle, by which Mr. Gray distinguishes the 

 larger genera from the Tragelaphus. In these latter points Major 

 Smith is correct. 



I will now proceed to the "Antelopes of the Desert" of Mr. Gray, 

 a very well-marked, natural group, consisting of two distinct genera, 

 which have usually been widely separated. Mr. Blyth, however, in 

 the translation of Cuvier's 'Animal Kingdom,' hints at their affinity, 

 and Mr. Waterhouse informs me that he has long held that opinion. 

 Indeed he has placed the species next each other in the Catalogue of 

 the Society's Museum. 



Alcelaphus. 



A large deep impression hefore the orbit, but no fissure ; the mas- 

 seteric ridge not extending high ; the bones of the face lengthened 

 downwards and forwards, and the occiput also prolonged and dra^vn 

 downwards ; the auditory bulla large and prominent, enclosing a 

 large rounded space for the attachment of the stylohyal bone ; the 

 basioccipital tubercles high and sharp, the groove between them nar- 

 row in front, wide behind, with a flat space between the occipital con- 

 dyles ; the median incisors expanded at their summits ; the molars 

 rather small, narrow, and without supplemental lobes, showing, when 

 somewhat worn, a pit in the middle. 



Horns placed high, ringed at the base, with double flexures more 

 or less marked. 



Hab. Africa. 



A. bubalis. A. limatus. 



A. Senegalensis. A. pygargus. 



A. caama. 



I have seen skulls of the three last-named. 



Mr. Gray calls a portion of this genus " Boselaphus," doubtless 

 intending Alcelaphus of De Blainville, which being antecedent to 

 Major Smith's name Acronotus, should certainly be adopted. The 

 genus is a very natural one, and the characters by which Mr. Gray 

 proposes to divide it into two, are by no means sufficient. Tlie last- 

 mentioned species, A.pygargus, has usually been placed among the 

 Gazelles, where it was left by Major Smith and by ]Mr. Blyth, who 

 speaks of it as leading "through A. Caama, Bubalis, Sec. to the 

 Gnus." Mr. Waterhouse, who in the Catalogue of the Society's Mu- 

 seum uses the generic name Ant Hope throughout, places this species 

 between the Gazelles and the others of its natural genus, to which 

 the Gnu follows. Mr. Gray, who had left it with the^Gazelles in the 

 ' List of ^lammalia ' in the British Museum, has removed it to its 

 true place m his paper in the * Annals and Magazuxe.' 



Catoblepas. 



The general characters of the skull the same as in Alcelaphus ; but 

 the depression before the orbit less marked ; the occiput rather less 

 prolonged, and its base, together with the auditory bulla, broader. 



Ann, if Mag. N. Hist. Ser. 2. Fb/.viii. 27 



