MICROTUS. 183 



Genl. Char. Size medium; tail less than half the length of head 

 and body. 



Color. Above yellowish brown and gray; sides fulvous; beneath 

 grayish, washed with pale fulvous; feet and tail grayish. 



Measurements. Total length, 121-1 31 ; tail vertebra',31 ; hind foot, 18. 



287. xanthognathus. {Arvicola), Leach (nee Harlan), Zool. Misc., 



1814, p. 60, pi. 26. 



Type locality. Hudson Baj'. 



Geogr. Distr. "Northwestern Canada from Central Alberta to 

 Arctic coast and west to central Alaska." 



Genl. Char. Ears large; tail shorter than head; posterior half 

 of soles hairy. 



Color. Above dark brown and black; sides paler; beneath sil- 

 very bluish gray; two patches anterior to shoulders blackish gray; 

 blackish brown stripe on nose between two reddish brown stripes. 

 Tail beneath whitish. 



.Mtasurcments. Dry skin. Total length, 210; tail vertebrae, 50; 

 hind foot, 27. 



288. chrotorrhinus. {Microtus), Miller, Proc. Bost. Soc. Nat. Hist., 



1894, p. 190. 



Type locality. Mount Washington, New Hampshire. 



Geoi^r. Distr. The Catskills. New Hampshire northward into 

 New Brunswick to Trowser's Lake and central Quebec. 



Genl. Char. Similar in size to J/, pennsylvanicus ; hind feet 

 smaller; posterior upper molar with three nearly closed outer trian- 

 gles; third lower molar with five closed triangles, five inner and five 

 outer salient angles and double-lobed posterior loop. 



Color. Upper parts and sides, between raw umber and broccoli 

 brown mixed with black; muzzle ochraceous; sides of neck and head 

 tinged with same color; beneath silvery gray; tail above grayish 

 brown, beneath hair brown; feet silvery gray, soles covered with 

 grayish hairs. 



^feasurements. Total length, 165; tail vertebra^ 45; hind foot, 

 19.4; ear, 13.8. 



a.—riivws. [Microtits), Bangs, Proc. Biol. Soc. Wash., 1898, p. 188. 



Type locality. Black Bay, Labrador. 



Geogr. Distr. Known only from type locality. 



Genl. Char. Similar to .1/. chrotorrhinus; paler; skull more slen- 

 der and constricted between orbits; rostrum more slender; audital 

 bulla- Hatter; less inflated. 



Color. Above pale grayish raw umber, mixed with black on 

 back; nose and face pale tawny ochraceous; under parts and feet 

 gray; tail above dusky brown, paler and grayer beneath. 



