554 



PROF. W. RIEGEWAY ON THE 



[May 11, 



River, below which the Grevy species, as is stated by Mr. A. H. 

 ISTeumann, does not occur. On the other hand the Bvirchell type is 

 never found in Somaliland or Shoa, where the Grevy species seems 

 to be the sole zebra, and where its nearest neighbours are the 

 Somali and the Abyssinian Asses. It thus extends fui-ther up than 

 the other zebras in North-east Africa. But in the region round 



Text-fie-. 147. 



Gvevj- Zebra (female) ; Euaso Nyiro (3000 ft.) 



Lake Baringo where the Grevy Zebra overlaps the Burchelline, 

 at least one specimen of the latter is known to possess a functional 

 premolar, a feature common in Grevy Zebras, and a peculiarity 

 which is a survival from Pliocene forms such as E. sivcdensis of 

 India and E. stenonis of JS"orth Africa and Southei-n Europe. 



Two of my skins (text-figs. 148 & 149), both from animals shot 

 at Lake Baringo, have small stripes or spots indicating vestiges 



