M'CHESNEY on DAKOTA MAMMALS. 



207 



Eyes well developed, and set in a definite black area, "wMch extends 

 entirely around the eye as a narrow border, tlie same as seen in R. leu- 

 coptis. 



Teats: I can discover but three pairs in this specimen, two inguinal 

 and one pectoral. 



Fore feet : middle toe longest ; first and third of equal length and but 

 little shorter; fourth toe reaching but little beyond base of the third j 

 thumb rudimentary, and with more of a nail than a claw. Five tuber- 

 cles ; one at the base of the inner and one at the base of the outer toes; 

 one at the base of the second and third toes; one back of the one at 

 base of the thumb ; and one behind the tubercle at base of the outer toe, 

 the last two being aligned. 



Hind foot: but four tubercles are here discoverable; the one back of 

 the tubercle at base of the outer toe is wanting. 



Whiskers : arranged in five parallel rows, the three inner ones of 

 which are black throughout: the two outer rows are white for their 

 entire length. Longest hairs are 1.28 in length. 



Head and forehead are a trifle darker gray than the back. Kose a 

 little lighter than head. Chin white. 



T he specimen measures as follows : — 



From tip of nose to eye 0. 53 



From tip of nose to ear ." 1.16 



From tip of nose to occiput 1. 40 



From tip of nose to tail 4. 80 



Tail to end of vertebrae 1. 80 



Length of fore foot - 0. 56 



Length of hind foot 0. 85 



Length of longest fore elaw 0.16 



Width of palms 0.22 



Height of ears..„ 0.48 



Longest hairs 1.28 



Specimen taken at Fort Sisseton, Dakota Territory, August 25, 1877. 

 Measurements of specimens. 



Place of col- 

 lecting. 



Fort "Wads 

 worth, Dak 



do 



Fort Sisseton 

 Dak. 



do 



do 



do 



do 



do 



do 



do 



do 



do 



Date of col- 

 lecting. 



Aug. 30, 1876 



Aug. 31, 1876 

 Oct. 10,1876 



Oct. 28, 

 Nov. 3, 

 Nov. 12, 

 Jan. 29, 

 Mar. 26, 

 June 9, 

 .lune 10, 

 Aug. 25, 

 Sept. 8, 



1876 

 1876 

 1876 

 1877 

 1877 

 1877 

 1877 

 1877 

 1877 



