1881.] Himalayas, Tibet, and Afghanistan. 107 



Arvicola blythi, W. Blanf J. A. S. B., 1875, XLIV, pt. 2, p. 107 ; id. 



Scientific Results Second Yarkand Mission, Mammalia, p. 39, pi. 



Vlll,fig. 2, &pl. X, b. fig. 1. 



Colour above earthy brown (yellowish brown with a greyish tinge), 

 below brownish white. Feet the same colour as the "underparts ; tail light 

 brown. 



Far soft, the basal two thirds on the upper surface, and about one 

 half on the lower, dark slaty ; the tips on the upper surface of two kinds — 

 the finer isabelline, the coarser dark brown, almost black ; tips on the 

 abdomen brownish white. 



Ears small, round, not extending beyond the fur, thinly clad with 

 light-brown hairs inside, more thickly and with longer hairs outside. 



Whiskers dark brown above, white below, the longest nearly an inch 

 in length. 



Feet of moderate size ; claws compressed, horn-coloured ; thumb short, 

 with a short compressed claw. 



Tail cylindrical, about one fourth to one third the length of the head 

 and body, covered with short hair. 



The following dimensions are (1) from a fresh specimen taken by Dr. 

 Stoliczka, (2) from another fresh specimen, a large female, by Mr. Theo- 

 bald, (3) from an adult specimen in spirit : — 



(1) (2) (3) 



in. in. in. 



Length of head and body 4 49 37 



„ of tail, without hairs at end 135 1*25 11 



„ of ear , 033 



Breadth of ear 0«37 



Length of fore foot and claws 0*45 



„ of hind foot and claws 0-82 



„ of skull 1'03 



The following are the characters of the molar teeth : — 

 Upper molar I, 5 spaces, 3 external and 3 internal angles, 

 j? jj J-J-, 4 ,, o ,, ,, ^ ,, „ 



,, ,, III, 5 „ 3 „ „ 3 „ ,, 



Lower molar I, 7 „ 4 „ „ 5 „ „ 



j) jj H> O . » *5 ,, ,, O ,, ,, 



>) » 1H> * » & •>•> J' " » » 



In the third upper molar all the internal angles are much more promi- 

 nent than the outer, and the first two internal angles are more developed 

 than the last. The first space is included by the first internal and first 

 external angle, the second space by the second external angle, the third by 



