34 MAMMALIA GLIRES. [ARVICOLA. 



48. A. riparia, Yarr. (Bank Campagnol.) Fur bright 

 chestnut-red above, ash-colour beneath : tail half the length 

 of the body ; the hairs at the tip a little elongated. 



A. riparia, Yarr ell in Proceed, of Zool. Soc. (1832) p. 109. Id. in 

 Loud. Mag. of Nat. Hist. vol. v. p. 598. 



DIMENS. Length of the head and body three inches four lines ; of the 

 head one inch half a line ; of the ears five lines ; of the tail one inch 

 eight lines. 



DE SCRIPT. Distinguished from the A. agrestis by its brighter and 

 more rufous colour ; tail longer, with the hairs at the tip extending be- 

 yond the bone ; ears rather larger, and more prominent : under parts 

 cinereous, with a faint yellow tinge along the mesial line of the abdomen 

 and on each side of it: tail blackish above, white beneath, the two 

 colours separated by a well-defined line. 



First discovered by Mr Yarrell at Birchanger in Essex. Has since 

 occurred in Hertfordshire, Middlesex, Berkshire, and Cambridgeshire, 

 but is not so plentiful as the A. agrestis. Frequents hedge-bottoms and 

 ditch-banks, also occasionally stacks of corn. Is said to construct its 

 nest of wool. Obs. Independently of the above external diiferences be- 

 tween this and the last species, there are others connected with their 

 anatomy, which will be found detailed at length in Loud. Mag. 1. c. 



t GEN. 18. CASTOR, Linn. 



t 49. C. Fiber, Linn. {Beaver.) Fur of a deep chestnut-brown; 

 glossy above, dull beneath. 



C. Fiber, Desm. Mammal, p. 277. Common Beaver, Shaw, Gen. Zool. vol. 11. 

 p. 30. pi. 128. 



DIMENS. Length of the head and body two feet six lines ; of the head five 

 inches; of the tail one foot; breadth of the tail four inches two lines. DESM. 



DESCRIPT. Head short and thick, somewhat flattened at the top ; muzzle obtuse : 

 eyes small and black : ears short, and rounded at the extremity : neck short : body 

 thick, very convex on the back : tail depressed, broad, and of an oval form ; the 

 surface naked and scaly. Fur of a deep chestnut-brown colour, smooth and glossy 

 on the upper parts, more dull underneath. 



Formerly an inhabitant of Wales and Scotland. Observed in the former country 

 by Giraldus de Barri in the year 1188. Not exactly known when the species 

 was extirpated. Has occurred in a fossil state in Cambridgeshire. 



GEN. 19. LEPUS, Linn. 



50. L. timidus, Linn. (Common Hare.) Tawny 

 gray, shaded with brown : ears longer than the head ; 

 black at the tips: tail black above, white beneath. 



L. timidus, Desm. Mammal, p. 347. Flem. Brit. An. p. 21. Hare, 

 Penn. Brit. Zool. vol. i. p. 98. Shaw, Gen. Zool. vol. n. p. 197. 

 pi. 162. 



DIMENS. Length of the head and body twenty-one inches nine lines ; 

 of the head four inches ; of the ears four inches ten lines ; of the tail 

 three inches six lines. 



