XX a. 

 Prairie Red-backed Vole. 



Evotomys gap pert loringi Bailey. 



Qoringi, in honour of J. Alden Loring, who collected the type specimen at Portland, 

 North Dakota, November 22, 1895.) 



Evotomys gapperi loringi Bailey, iSgy^Proc. Biol. Soc.Wash., 

 May 13, 1897, p. 125. 



Type Locality. — Portland, North Dakota. 



This race of the Gapper Mouse differs from the typical 

 form chiefly in its smaller, slenderer skull, and in being much 

 smaller and brighter coloured. It is, indeed, the smallest known 

 Evotomys in North America. 



The average of i8 adults from the type locality gave the 

 following measurements: 



Length, 4I inches (123 mm.); tail, i\ inches (31.5 mm.); size 

 hind-foot, H inch (17.9 mm.); the tail being about \ of total 

 length. 



^'FuU winter pelage: Dorsal stripe sharply defined, extend- colour 

 ing from anterior base of ears back between ears to rump, pale 

 reddish hazel, scarcely darkened with black hairs and frosted 

 from the presence of a white subterminal zone. In some 

 specimens with the maximum of white the back is fairly hoary, 

 in others the chestnut predominates and conceals the white 

 zone. Face, sides, and rump, bright grayish ash, more or less 

 washed with buffy; belly pure white or rarely creamy white; 

 ears pale chestnut; feet pure white; tail sharply bicolor, whitish 

 below, blackish brown above; pencil black above, a few white 

 hairs below. Adult males with large whitish or light grayish 

 spots over the side glands. Summer pelage: Dorsal stripe dark, 

 rich chestnut; sides and face pale bister, more or less suffused 

 with yellowish; belly thinly washed with white or whitish; feet 



513 



