182 MICROTUS. 



Geogr. Distr. Hudson Bay to Alaska, and from United States 

 northern boundary to Fort Anderson, Northwest Territory. 



Genl. Char. Size small; tail short. Skull narrow, slender. 



Color. Sutnnur Pelage. Above dark brown, suffused with pale 

 fulvous and lined with black; dorsal area blackish brown, side grayer; 

 beneath whitish gray, base of hair plumbeous; sides of nose and 

 front of ears yellowish; feet silver gray; tail blackish brown above, 

 grayish beneath. Winter Pelage. Paler; ears and nose more con- 

 spicuously yellow. 



Measurements. Total length, 143-156; tail vertebra?, 33-39; hind 

 foot, 17-19; ear, 8.5. Skull: occipito-parietal suture to end of nasals, 

 23; zygomatic breadth, 13.6; interorbital breadth, 13.6; width of 

 brain case, 12; length of nasals, 7; incisors to post-palatal notch, 7. 



258. aztecus. (Arrieola), Allen, Bull. Am. Mus. Nat. Hist., N. Y., 



1893, p. 73- 



Type locality. Aztec, New Mexico. 



Geogr. Distr. Estes Park, Colorado, to \'alley of San Juan 

 River, New Mexico. 



Genl. Char. Size large; tail short; skull very narrow. Interpa- 

 rietal twice as wide as long. 



Color. Above grayish brown tinged with buff; beneath grayish 

 white; feet dusky. Tail dusky brown above; white beneath. 



Measurements. Total length, 146-170 ; tail vertebrae, 35-42 ; 

 hind foot, 17. 3-18. 



259. enixus. {Mierotus), Bangs, Amer. Natur., 1896, p. 1051. 

 Type locality. Hamilton Inlet, Labrador. 



Geogr. Distr. Eastern coast of Labrador from Hamilton Inlet 

 to Ungava Bay. 



Genl. Char. Size medium, tail long; hind foot large; molars 

 small, weak; incisors long, slender, projecting outward. Hip glands 

 present in adult males. 



Color. Above dark burnt umber brown, mixed with black; 

 beneath dark graj'; feet dusky; tail above black, beneath dark gray. 



Measurements. Total length, 210 ; tail vertebrae, 67 ; hind 

 foot, 22.5. 



260. terraenovae. [Microtus), Bangs, Proc. Biol. Soc. Wash., 1894, 



p. 129. 

 Type locality. Codroy, Newfoundland. 

 Geogr. Distr. Newfoundland and Penguin Island. 

 Genl. Char. Size of M. pennsylvanicus, but with larger feet; tail 

 more than twice the length of hind foot. Skull broad and short; 



