DIFFERENTIATION OF ZEBRAS. 



?557 



1909.] 



But as Ward's Zebra is virtually the Mountain Zebra only locally 

 varied, I submit that it was in the northern part of British East 

 Africa that the difierentiation of the three species, not only in 

 colour, but also in osteology, had begun. 



Text-fio-. 150. 



Grant's Zebra (male) ; Laikipia (5800 ft.)- 



In this area there are lofty mountains, elevated plateaus and 

 low-lyino- swamps, as well as hill country with abimdance of 

 grassy patches in it. Is it to these different types of country that 

 the differentiation in types may be due ? 



