EVOTOMYS 269 



Range. — Known only from the type locality. 



Characters. — Resembling typical E. gapperi, but with slightly 

 darker ('" plain chestnut ") mantle, less buflfy sides, slightly 

 shorter tail and larger hind-foot, the general body measurements 

 and those of the skull being as in the typical form. 



For external and cranial measurements, see table at end of 

 volume. 



Remarks. — Bailey says : " The slight shortness of the tail 

 compared with that of typical gapperi is entirely within the range 

 of individual variation and discrepancies in the methods of taking 

 measurements. If a more extensive series of specimens should 

 prove the colour and foot characters inconstant, the subspecies 

 will have to be given up. With the material in hand I prefer 

 to retain it, though other more marked forms remain unnamed." 



Regarded by Miller (Bull. N.Y. State Mus., 8. p. Ill, 1900) 

 as a distinct species. 



2M. Evotomys gapperi loringi Bailey. 



1897. Evotomys gapperi loringi Bailey, Proo. Biol. See. Washington, 

 11, p. 125; Miller, " List," 1912, jp. 211 ; " List," 1924, p. 402. 



T«/j9e.— U.S. Nat. Mus., No. 75795 (Biol, Surv. Coll.) ; adult 

 male, collected Nov. 22, 1895, by J. Alden Loring. 



Type locality. — Portland, Traill County, North Dakota. 



Range. — Timbered valleys along edge of plains in Minnesota 

 and eastern North and South Dakota. 



Characters. — The smallest member of the genus occurring in 

 America, hind-foot averaging 17-9 mm. 



Colour bright. Mantle in winter sharply defined, extending 

 from anterior base of ears to rump, pale reddish-hazel, scarcely 

 darkened with black hairs and frosted by the subtermiual hair- 

 bands. 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 greyish-ash more or less washed 

 with buflf. Belly pure white, rarely creamy. Feet pure white. 

 Tail sharply bicoloured, dusky above, whitish below; pencil 

 black above with a few white hairs below. Adult males with 

 large whitish spots over lateral glands. In summer mantle dark 

 rich chestnut. Sides and face pale bistre, more or less suffused 

 with yellowish. Belly thinly washed with white or whitish. 

 Feet dusky. Tail darker and less sharply bicoloured. Ears 

 brownish. Side spots in old males sooty grey. 



Skull smaller, narrower and more slender than in the typical 

 form; not ridged or angular even in old age. Posterior edge of 

 palate straight or with a slight median projection. Auditory 

 bulla? less rounded and inflated. 



Remarks. — This is described by Bailey as intergrading with 

 typical E. gapperi. He regards E. g. loringi as a development 



