British Furms of A.\)oi[{i\\\w3. 123 



tlic silvery ventral surfaces frequently show a feeble pectoral 

 spot and traces of a median aljdominal yellowish wash. 



The skull (c.-b. 1. 20-(]-2;3-3) a<,necs with the "highland'' 

 race in size ; in its great zygomatic breadth, broad inter- 

 orbital region, the postmolar length, and long molars it 

 agrees with or approaches the Bute form ; the brain-case is 

 no wider than in the highlands, but still deeper than in 

 l^ut(! ; the bulla' are slightly smaller than in either; as in 

 Welsh and Irish skulls the palatal length averages slightly 

 shorter than usual ; the incisive foramina are slightly longer 

 and narrower than in Bute. 



A. sylvaticus butei ^, subsp. n, 



A/Hxlonus sylvaticus syleatk-tis, lianett-IIaiuiUoii & Iliuton, P. Z. S. 



rjJ3, p. ttyo. 



Hab. Bute. 



Material examined. Seventeen adults (nine male, eight 

 female), collected by Mr. K. W. Sheppard between Dth and 

 23rd March, 1912. Dimensions : — 



Tail, Hind foot, 

 Head without without 

 & body. hairs. claws. Ear. C.-b. I. 



Average 887 77-8 22 14-7(3 (of 14) i'2-04 



Maximum and type.. 100 80(90) 22-5(23) 15(10) 23-2 



This form is characterized externally by its small size and 

 dark coloration ; a faint trace of the pectoral spot is 

 frequently present. 



The skull is small (c.-b. 1. 20-4-23-2) ; the relative dimen- 

 sions show, in comparison with A. s. sylvaticus of England, 

 distinctly greater zygomatic, interorbital, and cranial 

 breadths ; a deeper brain-case ; shorter postmolar region, 

 with the bullae enlarged rather than diminished ; longer and 

 rather wider nasals ; greater palatal length ; slightly longer 

 and much wider incisive foramina ; narrower rostrum; and 

 longer molars. A comparison of the data given in the table at 

 pp. 120-121 will show that in several respects, e.^., the palatal 

 and postmolar lengths, this form resembles the " highland '* 

 race, but in others, e. g.^ the zygomatic, interorbital, and 

 cranial widths, it stands quite apart or else resembles the 

 specimens from Skye. 



There can be no question that this race is distinct from 

 that inhabiting England, and I have therefore given it a new 

 subspecitic name. The forms from Skye and the Scotch 



* In honour of the Marquis of Bute, to whose generosity we largelv 

 owe this llehridean collection. 



