540 SIR V. BROOKE ON THE GENUS GAZELLA. [June 3, 



1870. G. dorcas, Blanf. Geol. and Zool. Abyss, p. 261. 



Hair very short and soft. Central facial band sandy rufous. Nose- 

 spot absent. Light facial streak present but indefinite, running into 

 the dark facial streak, which is in some specimens but faintly marked ; 

 dark lateral band almost obsolete ; light lateral band of a delicate 

 pale fawn-colour, distinctly visible against the isabelline sandy fawn- 

 colour of the back and haunches. Tail variable, but generally rufous 

 for a large part of its length, the tip blackish. Horns short, 

 massive, and strongly ringed, the tips bent suddenly forwards and 

 inwards. Ears very long. Height less than that of the last species. 



Hab. Kordofan ; Senaar. 



The principle which I have allowed to influence me in retaining 

 under a name and description distinct from that applied to the 

 Gazelles of Egypt and N. Africa, the Gazelles from Senaar and 

 Kordofan, is contrary to that which generally obtains in like cases. 

 It is not that I believe that the diagnosis above given will be found 

 invariably to sever the individuals obtained in one locality from 

 those obtained in the other. On the contrary, I am convinced that 

 every intermediate degree will be found represented in the inter- 

 mediate countries, if not upon the confines of the countries which are 

 supposed to be the home proper of each race or persistent modifi- 

 cation. 



I have lately received from Mr. Gerrard some specimens of a 

 Gazelle from the Bogos country. In these the general texture of 

 the hair is entirely that of Gazella Isabella, while the intensity of the 

 facial and other markings, and the intermediate growth and character 

 of the horns, places them in a position exactly intermediate to those 

 of Egypt and Kordofan. At the same time, perhaps, amongst the 

 smaller Gazelles, no two species could produce two more dissimilar 

 animals than typical specimens of Gazella dorcas and Gazella Isabella. 

 Having seen both animals living, I speak with more confidence than 

 would be the case from the examination of museum specimens alone. 

 If, therefore, a command of a large series of specimens reveals in- 

 termediate forms between two well-marked and persistent races, a 

 considerable probability is afforded that, all conditions being alike, 

 where, from a paucity of knowledge and specimens, two persistent 

 modifications or species of the group appear definitely severed, a 

 larger number of specimens would produce similar intermediate 

 forms. 



3. Gazella rufifrons. 



1764. La Corine, Buff. H. N. xii. p. 261, pi. 27, ? . 



1781. Corine, Pennant, Quad. p. 89. 



1801. , Shaw, Zool. p. 353, plate 194. 



1818. Le Kevel 1 -& ^ • tt x T at i * 



1822. Le Corine j ' P " Cuvier ' H " N ' M " P lateS - 



1820. Antilope dorcas, Desmarest, Mamm. p. 453 (part.). 



1829. A. dorcas $ , Fisch. Syn. p. 459. 



1836. A. corina, Goldf. Schreb. Suppl. v. p. 1 193, pis. 270, 271. 



1846. Gazella rufifrons, Gray, Ann. Nat. Hist, xviii. p. 214. 



