126 Mr. M. A. C. Hintou on 



tlie molars a little longer. The postmolar length still 

 averages much less than is normally found in any of the 

 races of sylvaticus examined. In view of these differences it 

 is worth recalling that both de Winton and Barrett-Hamilton 

 thought that two distinct forms of Apudemus occur on Lewis 

 (P. Z. S. 1900, pp. 395,400). 



In the few skins before me from Noi'tli Uist, South Hist, 

 and Barra (inclusive of those in the Royal Scottish Museum, 

 kindly lent on a former occasion by Mr. Eagle Clarke) the 

 ventral surface is silver, with hardly any trace of a bufFy 

 suffusion. 



In the single skull before me from Barra the zygomatic 

 breadth is relatively a little less than the Stornoway average, 

 but the interorbitalj cranial, and nasal widths and the post- 

 molar lengths are nearly identical. The bullae are slightly 

 smaller, the palatal length is distinctly, the diastema a little 

 shorter than in h. hebridensis, with distinctly smaller incisive 

 foramina, broader rostrum, slightly wider masseteric plate, 

 and longer molars. 



South Uist. 



One from Loch Boisdale, collected by Mr. D. Anderson : — 



Tail, Hind foot, 

 Head without without 

 & body, hairs, claws. Ear. 

 No. 4G, c?, 14th May, 1913.. 91 ' 86 22 15 (old, teeth much 



worn, but skull broken). 



Apodemus hebridensis hamiltoni, subsp. n. 



Hab. The island of Rum, Inner Hebrides. 

 Material examined. Five, collected by INIr. D. Anderson, 

 viz. : — 



C.-b. 1. 

 25-5 (tj'pe). 



25-1 



This form resembles A. h. hebridensis, its closest ally, in 

 its large size, big hind feet, and short ears. The general 

 colour of the neck is as in hebridensis ; the silvery ventral 

 surface is irregularly darkened bv the slaty bases of the 



