12S Mr. M. A. G. Uintou on 



Apodem,us hebridensis cnmhrce, subsp. n. 



Aporlemus st/lvaticus sylvaficns, Barrett-Hamilton k, Ilintoii, P. Z. S. 

 ]913, p. 835. 



Hab. Great CuMnRAR. 



Material examined and dimensions. Six adults (four male, 

 two female), collected by Mr. R. W. Sheppard betAveeu 

 27th and 30tli March, 1912 :— 



Tail, Hind foot, 

 Head without without 



& body, hairs. claws. Ear. C.-b. 1, 



Average 93 ' 90-3 22-8 15-4 (of 4) 22-95 



Maximum 95 92 23 15 (16) 23-4 



Type 93 90 23 15 232 



Description. Back rufous, little darker than flaijks, the 

 black hairs being few in number and short ; line of demar- 

 cation clear, though contrast between flank and belly is not 

 nnusually striking ; ventral surface nearly clear silver, with 

 hardly a trace of a pectoral spot. 



The skull is much like that of A. h. hebride7isrs, from 

 which it differs principally in its smaller size. From the 

 relative din ensions it would appear to have the interorbital 

 region a little narrower, the cranial width greater, the nasals 

 slightly shorter and widei', the diastema and incisive foramina 

 a little shorter than usual in the typical subspecies. 



The dimensions of a female from Gigha (P. Z. S. 1913, 

 p. 836) are :— H. B. 100, T. 85, 11. F. 22-5, E. 15 ; its general 

 appearance is not unlike that of the Cumbrae mice. It 

 differs in having the back and flanks slightly darker, the line 

 of demarcation much more definite^ in its greater size and 

 shorter tail. In the absence of the skull one must leave it 

 for the moment with the Cumbrae form. 



Four adults from Tiree (8th to 13th July, 1912), average 

 102-5-84<-25-23-l-13-5, the maximum being 105-88-24- 

 13 (13'5), are larger than those of Great Cumbrae, and have 

 considerably shorter ears and tails. In colour they are 

 quite like the Cumbrae form. The only complete skull 

 before me, though with the teeth nearly worn oiit, is very 

 small (c.-b. 1. 22 8) ; in them the nasals appear to be longer 

 than usual, the palatal length increased, the diastema is 

 short as in Great Cumbrae, but the rostrum is a little 

 broader. When further material comes to hand this form 

 will probably need distinct subspecific recognition. 



