172 EVOTOMYS. 



242. dawsoni. {Evotomys), Merr., Am. Natur., 1888, xxii, p. 649. 

 Type locality. Finlayson River, Northwest Territory, lat. 61° 



30' N., long. 120° 30' W. Altitude 3,000 feet. 



Geogr. Distr. Finlayson River and Fort Liard, west to Yaku- 

 tak and Juneau, and north along coast lo Prince Williann Sound. 



Genl. Char. Size large; tail short rarely twice as long as hind 

 foot. Skull: short, broad; audital bullae very small and flat; nasals 

 rounded; notch in center of palatal arch; incisors large. 



Color. Above bright ferruginous; face, sides and rump buffy 

 ochraceous; belly washed with pale buff; feet buffy; an indistinct 

 yellowish post-auricular spot; faint yellowish orbital ring; tufts of 

 rufous hairs in front of ears; usually white patch on throat. Tail, 

 above mixed rufous and black, beneath buffy ochraceous. 



Measurements, Average total length, 144; tail vertebrae, 33; hind 

 foot, 20. Skull: basal length, 22.5; nasals, 7.5; zygomatic breadth, 

 14; mastoid, 12.2. 



243. orca. [Evotomys), Merr., Proc. Wash. Acad. Scien., 1900, p. 24. 

 Type locality. Orca, Prince William Sound, Alaska. 



Genl. Char. Size medium, skull similar to M. dawsoni. 



Color. Above dark chestnut, darkest on rump; sides yellowish 

 mixed with black; face grizzled with buffy gray and black; beneath 

 deep ochraceous; hind feet dusky. Tail, dusky above, buffy beneath. 



Measurements. Total length, 138; tail vertebras, 30; hind foot, 20. 



244. gapperi. (Arvicola), Vigors, Zool. Journ., v, 1830, p. 204, pi. ix. 

 fuscodorsalis, Allen, Bull. Amer. Mus. Nat. Hist., 1894, p. 103. 



Type locality. Lake Simcoe, Ontario, Canada. 



Geogr. Distr. Massachusetts, New Jersey and Pennsylvania 

 northward, and in Canada west to the Rocky Mountains. 



Genl. Char. Slender, color bright; feet delicate, tail about twice 

 the length of hind foot. 



Color. Winter Pelage. Dorsal stripe chestnut mixed with black; 

 sides buffy ochraceous; under parts pale buff; feet silvery gray. Tail, 

 above brownish, pencil black, beneath graj'ish buff to the tips. 



Summer Pelage. Colors generally darker everywhere. 



Measurements. Total length, 143; tail vertebrae, 38; hind foot, 18. 



(7. — ochraceus. [Evotomys), Miller, Proc. Bost. Soc. , 1894, p. 193. 



Type locality. Mount Washington, New Hampshire. 



Geogr. Distr. White Mountains of New Hampshire, and prob- 

 ably east to Nova Scotia. 



Genl. Char. Similar to E. gapperi, but slightly larger, duller 

 and paler. Skull like that of E. gapperi. 



