1909.] DIFFERENTIATION OF ZEBRAS. 055 



of such small stripes as those found on the croup of Crawshay's 

 Zebra from Nyassaland, and which i-esemble the small stripes 

 on the croup of many Grevy Zebras and the " gridiron " of the 

 Mountain Zebra. 



Text-fie-. 148. 



Grant's Zebra (malo) ; Baringo (3000 ft.) 



Thus at Lake Baringo we have a point of contact between the 

 Grevy and the Burchelline Zebras, not only in coloration but in 

 osteology. Now if we could find a zebra of the Mountain type in 

 that same area we might not unreasonably infer that in this 

 region we have the point from which the various species of zebi-as 

 had radiated. 



