THE GAZELLES AND THEIR ALLIES 581 



Asia, and the Mediterranean coast of Africa. Later, in the 

 Pleistocene age, gazelles became abundant in North Africa, 

 as shown by the several species which have been discovered 

 in deposits of this age in Algeria. 



Key to Species of Gazella 



Size large, horns long in the male, more than two times head; adult 

 male without dark flank band usually 

 Cinnamon coloration of back continued as a broad band on the 

 rump to the tail and widely separating the white 

 rump patch; horns short and diverging only slightly 

 at tips; body size smaller petersi 



White rump patch undivided by cinnamon of back or at most 

 dorsal color only continued as a narrow stripe to the 

 tail; horns larger and more lyrate in shape, body size 

 larger grafiti 



Size small, horns in the male much less than two times the length of 

 the head; sides with a broad dark flank band 

 Dark flank band bordering the white of the belly; sides with a 

 conspicuous groin gland clothed by pithy yellow 

 hair; a dark nose spot thomsoni 



Dark flank band separated by buffy band from the white belly; 

 no lateral glands present; nose spot obsolete 



rufifrons 



Grant Gazelle 



Gazella granti 



Typical granti is found only in central German East 

 Africa, in Ugogo, where it was originally discovered by 

 Speke and Grant, in 1848, during their journey of discovery 

 of the source of the Nile. This point marks the southern 

 limit of Grant gazelles in Africa. Here it was found inhab- 

 iting a dry, arid, saline valley at some 3,000 feet elevation. 

 From this point the species ranges northward through the 

 Rift Valley as far as Lake Zwai, in southern Abyssinia, 

 where the race lacuum occurs. Westward the species 

 spreads to the southern shores of the Victoria Nyanza and 

 enters the Nile watershed. In this southwestern corner 



