The American Voles of tJic Genus Evotomys. 131 



Color [type specimen skinned ont of alcohol]. — Dorsal area not sharply 

 defined, dull brownisli chestnut ; sides and face buffy gray, finely lined 

 with ))lackisli hairs; belly dark i)lunibeoup, heavily washed with buffy; 

 ears tipped with color of back ; feet dusky gray ; tail indistinctly bicolor, 

 soiled l)uffy below, brownish above ; sides of nose whitish ; a small white 

 spot under lower lip. 



Cranial chnmck'n . — Skull, compared with tliat of gapprri, long and 

 slender; brain case narrower; zygomata less spreading ; rostrum longer 

 and straighter ; audital bullae longer, flatter, and less rounded ; hoth 

 upper and lower incisox's slenderer ; lateral bridges of palate incomplete ; 

 molars as in gapperi, except the first upi^er, in which the edges of the 

 first and second inner salient loops meet and coalesce, inclosing a dentine 

 core. 



Measurements. — Type specimen, measured from alcohol by Dr. C. Hart 

 Merriam : total length, 1.34; tail vertebrae, o9 ; hind foot, 19. Skull: 

 basal length, 22.8 ; nasals, 7 ; zygomatic breadth, 13.5 ; mastoid breadth, 

 1 1 ; alveolar length of upper molar series, 5. 



General remarks.— The type and only specimen was skinned and made 

 up from alcohol, and doubtless the colors have changed somewhat ; but 

 the small ears, slender feet and tail, and distinctive cranial characters 

 mark the species as entirely distinct from any other known form. In 

 geographic position it comes nearest to E. pruteus Bangs, of Hamilton 

 Inlet, Lal)rador, but in characters differs more widely from that species 

 than from the more distant gapperi. 



In a letter to Dr. ^leri-iam, ^Ir. Turner rejiorted the species as abun- 

 dant at Fort Chimo. 



Evotomys idahoensis Merriam. 



Evotomi/s idahoensis ^lerriam, North American Fauna Xo. 5, p. 66, July 

 ;J0,' 1891. 



Tgpe localili/. — Sawtooth or Alturus Lake, east foot of Sawtooth iNIouu- 

 tains, Idaho. 



Geographic range.— Monntiuns of south central Idaho, between Snake 

 River and the Salmon. 



General characters. — Size medium, larger than gapperi; conspicuously 

 different in color from any known species, the sides being clear gray ; 

 taillonger than in gapperi or galei ; ears not tipped with rufous; skull 

 narrow and smoothly rounded. 



Color. — Dorsal stripe well defined, extending from in front of ears to 

 rump, pale liazel, somewhat darkened with black-tipped hairs; face, 

 sides, and rump clear ash gray ; belly washed with white or whitish ; 

 ears sooty gray without rufous tips ; feet gray ; tail bicolor, gray below, 

 blackish above. Side glands scarcely visible in the specimens at hand. 



Cranial characters. — Skull long, narrow, and smooth, convex inter- 

 orbitally ; zygomatic arches very oblique ; rostrum long ; posterior margin 

 of palate straight ; pterygoids long and slender, longer, straighter, and 



