25 



15 



26 



16 



23 



14 



24 



16 



24 



14 



936 MR. I. G. S. MONf AdU ON A COLLECTION OV 



in the Royal Scottish Museum, and four adults (3 c? , 1 $ ) and 

 one young specimen ( cT ) collected by Montagu in June 1922. 



HB. T. HF. E. 



2Vjje2. Adult (?, 17. 6.22 91 91 



4. „ (?, 18.6.22 97 98 



14. „ c?, 20.6.22 98 89 



5. „ ?, 18.6.22 91 88 



1. Immature <?, 16. 6. 22 62 62 



Average of 1922 adults (4) 94-25 91-5 24-5 15-25 



„ „ all adults (13) 93-6 84-6 23-1 14-4 



Description. This form well resembles A. h. maclean in general 

 colour ; there is, however, less contrast between the back and 

 flanks, the latter being distinctly more rufous than the lighter 

 flanks of A. h. maclean. The ventral surface is silvery and the 

 pectoral spot even less distinct than in A. h. maclean. 



The appendage measurements of Sheppard have often been 

 found to require revision, and the fact that in this case 

 they do not agree vs^ith those of Montagu indicates that too 

 much reliance should not be placed on them. There can, 

 accordingly, be little doubt that the ears of Islay mice are longer 

 than those of the Mull form, with which they were formerly 

 associated. The. tail, also, like that of the Cumbrae, Grigha, and 

 Jura mice, is noticeably longer than that of the Mull and 

 typical A. h. hehridensis forms. The hind feet, far from being 

 small as suggested on p. 130 of (4), ai-e extremely large; it may 

 be noted that in the young specimen the hind foot is equal to 

 40 per cent, of the head and body length. 



The measurements of the recently collected skulls largely con- 

 firm the differences noted by Hinton in comparing this form 

 with A. h. maclean. The skull of A. h. tural is to be distin- 

 guished from the latter by its greater zygomatic and interorbital 

 breadths, broader and deeper brain-case, rather larger bullae, and 

 broader rostrum and masseteric plate. 



Apodemus hebridensis larus, subsp. n. 



Apodemus hehridensis macleaii Hinton, A. M. IST. H. 1914, 

 p. 130 (4). 



Habitat. Jura, 



Material examined and Dimensions. Three adults (2 d , I 2) 

 collected by Sheppard in May 1912, and two adults ( § ) collected 

 by Montagu in June 1922. 



HB. 



2>^e 123. Adult (?, 18.5. 12 100 



19. „ ?, 26.6.22 86 



20. „ $, 26.6.22 84 



Average of all adults (5) 92-6 



* Tail damaged in trap. 



T. 



HF. 



E. 



59* 



23 



14-5 



75 



23 



15-5 



94 



23 



15-5 



83-7 



22-8 



14-8 



