402 MICROTIN^ 



and, but for convenience' sake in dealing with their respective 

 geographical races, it might well be regarded as a subspecies of 

 the British Water- Vole. 



6a. Arvicola sapidus sapidus Miller. 

 1908. Arvicola sapidus Miller, Ann. Mag. N.H., [8], 1, p. 195; Troues- 



sart, Fauna Mamm. d'Europe, 1910, p. 195. 

 1910. Arvicola sapidus sapidus Miller, Proc. Biol. Soc. Washington, 



23, p. 20; Catal. Mamm. W. Europe, 1912, p. 733. 



Type.—BM., No. 8.8.4.115; adult female, skin and skull, 

 collected Oct. 7, 1906, by G. S. Miller. 



Type locality. — Santo Domingo de Silos, Province of Burgos, 

 Spain. 



Range. — Throughout the Iberian Peninsula. 



Characters. — General colour not so dark as in A. amphibius 

 amphihius, the sides and face a clear yellowish brown without 

 noticeable sprinkling of blackish hairs. 



Upper parts yellowish brown varying between " ochraceous 

 buff" and "clay colour," not infrequently tinged with russet: 

 back and crown sufficiently sprinkled with black hairs to produce 

 an evident effect of " lining," the sides and cheeks nearly clear. 

 Under parts pale ochraceous buff more or less darkened by the 

 slaty bases of the hairs. Feet drab grey. Tail brownish, lighter 

 below than above. 



For external and cranial measurements, see tables at end of 

 volume. 



66. Arvicola sapidus tenebricus Miller. 

 1884. Microtus nmsiniani Lataste, Actes Soc. Linn. Bordeaux, 38, 



p. 37 (in part); not Arvicola musignani de Selys-Longchamps. 

 1908. Arvicola tenebricus Miller, Ann. Mag. N.H., [8], 1, p. 196; 



Trouessart, Faune Mamm. d'Europe, 1910, p. 195. 

 1910. Arvicola sapidus tenebricus Miller, Proc. Biol. Soc. Washington, 



23. p. 20; Trouessart, Faune Mamm. d'Europe, 1910, p. x; Miller, 



Catal. Mamm. W. Europe, 1912, p. 735. 



Type.— B.M.., No. 6.1.21.5; adult male, skin and skull, 

 collected December 30, 1905, by J. F. Davison. 



Type locality. — Three miles east of Biarritz, Basses-Pyrenees, 

 France. 



Range. — Pyrenees and Atlantic coast region of South-western 

 France, north to the Garonne ; northern limit of range not known ; 

 two specimens from La Coruna, Galicia, Spain, appear to be 

 referable to this subspecies rather than to ^. s. sapidus. 



Characters. — Colour darker than in .4. s. sapidus, nearly as in 

 A. amphibius amphibius, the sides and face conspicuously 

 sprinkled with black hairs. 



Upper parts dull greyish buff, so heavily overlaid with black 

 that the general effect is usually not far from a rather light 



