1909.] 



riFFERENTIATION OF ZEBRAS. 



553 



notes in i-eference to a zebra shot in one locality that " along its 

 back were spots or blotches instead of distinct stripes," and he 

 remarks that there are many local varieties of the same species. 

 He told me also that in the area just referred to, all the Grant's 

 Zebras he met had this blotching on the back. In this respect 

 they seem to resemble my two skins fi-om Baringo. 



Text-fiff. 146. 



■Gi-evy Zebra (male) ; Euaso Nyiro (3000 ft. 



Can we discover the region where the differentiation of all three 

 species gradually took place ? It ought to be where all three 

 species once overlapped or still overlap. This would rule out South 

 Africa, for no animal of the Grevy type has ever been found in 

 those latitudes. But in the northern part of British East Africa 

 in the region round Lake Rudolph and Lake Baringo the Grevy and 

 Burchelline Zebras are found overlapping as far south as the Tana 



