MAMMALS FROM THE INNER HEBRIDES, 929 



43. On a fnrther Collection of Mammals from tbe Inner 

 Hebrides. By Ivor Gr. S. Montagu, F.Z.S. 



[Received October 14, 1922 : Read November 21, 1922.] 



(Text-figure 1.) ■ 



Systematic Iudes. 



Page 



Sorex araneus grantii 932 



Apodemus liehridensis tira, subsp. n 934 



Apodemus hebridensis ffhia, subsp. ii 935 



Apodemus hebridensis tural, subsp. n 935 



Apodemus Jieb7-idensis lartcs, snhsY). rt , 936 



Microtus agrestisfiona, subsp. n 940 



(Measurements in tbe Tables are in millimetres throughout.) 



The recent description of Hebridean mammals by G. E. H, 

 Barrett-Hamilton and M. A. G. Hinton in P. Z. S. 1913*(1), in 

 'A History of British Mammals' (2), and in Ann. & Mag. Nat. Hist. 



1913 (3), and by M. A. G Hinton in Ann. & Mag, Nat. Hist, 



1914 (4), neither completely exhausted the subject nor, in most 

 groups, sought to rtaake any definitive summaiy. Of tbe three 

 wild genera most abundantly distributed in the Hebrides — Sorex, 

 Apodemus, and Microtus, — only Apodemus has been the subject 

 of a detailed review, which, owing to paucity of material, was 

 of necessity left indeterminate as far as certain islands were 

 concerned. Valuable results were accordingly to be expected 

 from tbe examination of further mammal material from these 

 localities, and for this reason it was thought desirable to extend 

 the scope, originally of an entomological character, of a private 

 expedition to the Inner Hebrides undertaken by some students 

 at Cambridge University, to include the collection of mammals ; 

 specimens, described in this paper, were thus obtained on Islay 

 and Jura by I. G. S, Montagu, and on Gigha by G. E. Hutchinson 

 and G. L, E, Hancock. The results achieved by the inspection 

 of this and other material in the British Museum collection 

 have cleared up several of the indeterminate points in (4), have 

 shown the existence of certain foi"ms of Sorex araoieus which 

 have an interesting bearing on the history of the species, 

 and have pointed the way to a thorough revision of the Biitish 

 forms of Microtus. It should be noted that, again, in the case of 

 no group is a definitive summary attempted ; a final view of the 

 relationships of such a group as that treated in this paper is, in 

 the writer's opinion, only possible when forms from all the islands 

 inhabited by that group have been examined. Accordingly the 



* (1) " On a Collection of Mammals from the Inner Hebrides," P. Z. S. 1913. 



(2) ' A History of British Mammals.' Gurney & Jackson, 1912-19. 



(3) " Three new Voles from the Inner Hebrides, Scotland," A. M. N. H. 1913. 



(4) " Notes on British forms of Apodemus," A. M. N. H. 1914. 



