1873.] SIR V. BROOKE ON THE GENUS GAZELLA. 539 



an animal which both these authors considered distinct from their 

 Kevella. If, therefore, the Kevella be not Gazella dorcas, it must 

 represent a form of which we as yet know but little. 



In the Senckenbergian Museum at Frankfort 1 noticed two Gazelles 

 which had been brought in 1827 by Riippell from Arabia Petraea. 

 They stood labelled as G. dorcas, var. arabica. These specimens 

 appeared to me to differ decidedly from the Gazella arabica of 

 Ehrenberg from South Arabia, and, in the lyrate form of their horns 

 and in their markings, to be more nearly allied to the species under 

 consideration. In their larger size and stouter build, softer and finer 

 coat, as also in the paleness of their facial and lateral markings, 

 they presented considerable peculiarity ; and I have no doubt that 

 similar characters will be found to distinguish the Gazelles of Nor- 

 thern Arabia from those of Syria. Referring doubtless to this larger 

 race, Mr. Tristram (to whom I am indebted for a very beautiful and 

 typical specimen of Gazella dorcas, obtained in Syria) thus writes 

 in a letter with which he has kindly favoured me on the subject : 

 " Gazella arabica, Ehr., is common east of Jordan, and I have had 

 specimens .... I believe both species are there equally abundant, but 

 in rather different kinds of country." Now, to be strictly consistent, 

 a race so persistently modified, and so easily distinguishable as this 

 appears to be, should bear a definite title ; for the present, how- 

 ever I shall content myself with alluding to it, the materials avail- 

 able being quite insufficient for a thorough understanding of the 

 differentiation and distribution of the form in these countries. In 

 the same letter above quoted, Mr. Tristram writes : — "In Algeria I 

 noticed and obtained two Gazella dorcas and one specimen which I 

 presume was the Gazella corinna, Cuv." (more probably Gazella 

 cuvieri). "The smaller Gazella dorcas I found everywhere as far 

 as the Oran Sahara. The larger species I never got east of Biskra 

 (Constantiue). My impression was that the two species overlapped 

 in Algeria." 



Some very beautiful frontlets and horns brought by Colonel Grant 

 from Algeria, which 1 have had the pleasure of examining, appear 

 tome, as far as it is possible to judge from the horns alone, undoubt- 

 edly referable to Gazella dorcas. 



2. Gazella Isabella. 



1827. Antilope dorcas, Licht. Darst. t. 5. 



1843. Gazella dorcas, Gray, Cat. Mamm. Brit. Mus. p. 160 (part.). 

 1846. A. dorcas, a, Sund. Pec. p. 267. 



1846. Gazella Isabella, Gray, Ann. & Mag. Nat. Hist. p. 214 

 (vol. xviii.) ; Gray, Knowsl. Menag. p. 4. 



1850. ■ , Gray, P. Z. S. p. 1 13. 



1852. , Gray, Cat. Mamm. Brit. Mus. p. 57. 



1853. Gazella dorcas,Temm. Esq. Zool. p. 193. 



1855. , Wagn. Saugeth. p. 403 (part.). 



1859. , Gieb. Saugeth. p. 305 (part.). 



1863. , Heugl. Ant. und Buff. p. 5 (part.). 



1869. A. dorcas, Heugl. Reis. Weiss. Nil, p. 315 (part.). 



