732 



Arvicola amphibius eeta Miller. 



1832. Arvicola ater Maogillivray, Mem. Wernerian Soc. Nat. Hist, vi, 

 p. 429. Not Hypudseus terrestris p ater Billberg, 1827. 



1910. Arvicola amphibius reta Miller, Proc. Biol. Soo. Washington, xxm, 

 p. 19, March 23, 1910 (substitute for ater). 



1910. Arvicola amphibius reta Trouessart, Faune Mamm. d'Burope, p. x. 



Type locality. — Aberdeen, Scotland. 



Geographical distribution. — Scotland, except southern portion; 

 limits of distribution not known. 



Diagnosis. — Size less than in A. amphibius amphibius (hind 

 foot usually 30 to 32 mm., condylobasal length of skull usually 

 less than 42 mm.) ; normal colour darker than in the typical 

 race, the black usually in excess on upper parts ; melanism 

 frequent. 



Measurements. — Adult male from Glenfeshire Forest, Inverness : 

 head and body, 190; tail, 125; hind foot, 32; ear, 16. Adult 

 female from Windygates, Fife: head and body, 194*5 ; tail, 109 ; 

 hind foot, 30 "5; ear, 14 "5. For cranial measurements see 

 Table, p. 736. 



Specimens examined. — Twelve, from the following localities in Scot- 

 land : — Elgin, 1 ; Monar Forest, Boss, 1 ; Crieff, Perthshire, 1 ; Glenfeshire 

 Forest, Inverness, 1 ; Cortachy, Forfar, 3 (B.M. and Wilson) ; Windygates, 

 Fife, 5 (B.M. and Edinburgh). 



6. Llanbryde, Elginshire. W. Taylor (c & p). 11. 1. 3. 407. 



Scotland. 



i. Monar Forest, Boss- Maj.-Gen. 0. E. Luard 92. 8. 31. 1. 



shire. (c & p). 



<5. Kingussie, Inverness- G. A. Cooper (c. & p). 5. 5. 12. 1. 

 shire. 



9 al. Crieff, Perthshire. W. B. Oglivie-Grant 88. 5. 30. 2. 



(c & p). 



6,9. Windygates, Fife- N. B. Kmnear (o & p). 6.11.18.5-6. 



shire. 



6, ?. Cortachy, Forfarshire. E. A. Wilson (c & p). 11. 1. 3. 408-409. 



ARVICOLA SAPIDUS Miller. 

 (Synonymy under subspecies.) 



Geographical distribution. — Iberian Peninsula and southern 

 France east nearly to the Italian border; northern limit of 

 range not known.* 



Diagnosis. — Like Arvicola amphibius in general size and in 

 form of skull; nasal bones much widened anteriorly, their 

 greatest combined breadth nearly equal to that of rostrum ; 

 habits strictly aquatic, never mole-like. 



BemarJcs. — This species appears to be more nearly related to 



* An animal of this type occurs at least as far north as Paris (Lataste, 

 Actes Soc. Linn. Bordeaux, xxxviii, p. 37, 1884), but I have had no 

 opportunity to examine specimens. 



