20 Miller — Brief Synopsis of the Waterrats of Europe. 



color darker than in the typical race, the black usually in excess onupiter- 

 parts; melanism frequent. Central and northern Scotland. 



Arvicola sapidus ]Miller. 



^AkeArvicolaamphihius but nasal bones much widened anteriorly, their 

 jrreatestcomljined breadth nearly equal to that of rostrum ; habits aquatic. 

 Iberian Peninsula and southern France, east nearly to the Italian Imrder; 

 northern limits of ran^e not known. 



Arvicola sapidus sapidus ]Miller. 



lt*U8. Arvicola sapidus Miller, Ann. and "Slag. Nat. Hist., Sth ser. ,T, j). 

 lO-l. Fel)ruary, 1908. (Santo Domingo de Silos, Burgos, Spain). 



Color not so dark as in A. nnijihibius amphibius, the sides and face a 

 clear yellowish brown without noticeable sprinkling of blackish hairs. 

 Essentially the entire Iberian Peninsula ; lowlands of southern France east 

 of the Pyrenees. French specimens not perfectly typical. 



Arvicola sapidus tenebricus (Miller). 



19US. Arvicola teiiehricvH Miller, Ann. and Mag. Nat. Hist., Sth ser., I, 

 p. 19(). Fel)ruary, 1908 (Biarritz, Basses-Pyrenees, France). 



Color essentially as in .1. ainpJiibius arnplribins, the .sides and face con- 

 spicuously sprinkled with blackish hairs. Pyrenees and Atlantic coast of 

 .southwestern France, north to the Garonne; northern limits of range not 

 known. 



Arvicola terrestris (Linnteus). 



17.")8. [Mus] (erreslris Linna'us, 8yst. Nat., I, 10th ed., p. (11 (Upsala, 

 Sweden). 



Size less than in A. ampJnbius (head and body about 17-5 mm., tail about 

 100 mm., liind foot usually 28 to ol mm., coudylobasal length of adult 

 skulls '.M> to ;!9 mm. ) ; color dark, essentially as in A. amphibius reta, but 

 cheeks usually more yellowish than surrounding parts; skull slightly but 

 eviilently fossorial in form, the rostrum and occiput tending to l)eobli(|uely 

 truncate, tlie up|H!r incisors projecting noticeably forward ; interparietal 

 tending to be sulxpiadrate in outline; teeth rather heavy, but roots of 

 m 1 and m ^ not forming protuberances on lower surface of mandible; 

 hal)its both aquatic and mole-like. Scandinavian Peninsula, eastward 

 into Russia; limits of range not known. 



Arvicola italicus (Savi). 



18:)9. Arvicola amphibius var. ifalica Savi, N. Giorn. de' Letterati, 

 XXXVII, No. 102, p. 202 (p. o of separate), February, 1839 (Pisa, 

 Italy). 

 Similar to Arvicola tvrrestris, but teeth not .so heavy and color not so 

 dark, the underparts washed with yellowish brown instead of rusty; the 

 cheeks not contrasting noticeal)ly with surrounding parts. Italian Swit- 

 zerland ami uortlieru Italy, south at least to the vicinity of Pisa. 



