MR. M. A. C. HINTON^ ON IIEBRIDEAN MAMMALS. 



837 



The specimens from Tiree and Mull are, when adult, apparently 

 above the average size, and tend to have the large hind feet and 

 small ears of hebridensis. They also approach hehridensis in a 

 tendency to have the under side washed with yellow. 



Cranial measurements of Apodevitis sylvaticus sylvaticus. 



"We are unable to distinguish the specimens from the islands 

 from A. sylvaticus sylvaticus of the mainland. The dimensions 

 recorded above aftbrd an idea of the variability encountered in this 

 form : even allowing for errors on the part of the collector, and 

 for the diflering ages of individuals, there seems to be an inherent 

 tendency to vary. On all the islands, except Bute and Great 

 Cumbrae, there is a dimly seen tendency to acquire greater size, 

 larger hind feet, and shorter ears, i. e., a tendency to vary in 

 the same direction as hehridensis^ as further shown by the speci- 

 mens from Tiree and Mull, in which the belly tends to be 

 washed with yellowish tints. 



55* 



