180 MICROTUS. 



nasutus, Aud. & Bach., Proc. Acad. Nat. Scien. Phil., 1841, 

 p. 96. 



fulva, Aud. & Bach., Proc. Acad. Nat. Scien. Phil., 1841, p. 96. 



rii/escens, DeKay, N. Y. Zool., 1842, i, p. 85. 



oneida, DeKay, N. Y. Zool., 1842, i, p. 88. 



dekayi, Aud. & Bach., N. Am. Quad., 1854, in, p. 287. 



longtpi/is, Kenn., Agric. Rep., U. S. Patent Office, 1856, p. 304. 



rufidorsum, Baird, N. Am. Mamm., 1859, p. 526. 



Type locality. Near Philadelphia, Pa. 



Geogr. Distr. Atlantic coast westward to the Dakotas and 

 Nebraska. 



Genl. Char. Size large; tail more than one-third the length of 

 head and body. Feet very large, scaly. Head pointed. 



Color. Upper parts and sides reddish brown to yellow chestnut, 

 mixed with black; lower sides j-ellowish brown; beneath whitish ash, 

 tinged with brown. Feet and tail dusky, the latter paler beneath. 



Measurements. Total length, 167-171; tail vertebrse, 44-46; hind 

 foot, 21-24. 



a. — ni^rans. Rhoads, Proc. Acad. Nat. Scien. Phila. , 1897, p. 307. 



Type locality. Currituck, North Carolina. 



Geogr. Distr. Coasts of southern Virginia and northern North 

 Carolina. 



Color. Summer Pelage. Above bister lined with black, beneath 

 smoky gray. Tail, black above, sooty below; feet blackish. 



Winter Pelage. Colors darker, dorsal area nearly black. 



Measurements. Type. Total length, 175; tail vertebrae, 50; hind 

 foot, 23; ear, 9. 



h.~acadicvbs. {Microtus), Bangs, Amer. Natur., 1897, 31, p. 239. 



Type locality. Digby, Nova Scotia. 



Geogr. Distr. Nova Scotia and Prince Edward's Island. 



Genl. Char. Smaller than M. pennsylvanicus. 



Color. Winter Pelage. Above bister brown, shaded with russet, 

 sparsely mixed with black; beneath dark gray washed with white. 

 Summer Pelage. Above \'ellowish bister lined with black; tail brown- 

 ish black above, paler beneath; feet dusky plumbeous. 



Measurements. Total length, 172; tail vertebrae, 49; hind foot, 20. 



c. — modestus. {Arvicola), Baird, N. Am. Mamm., 1857, p. 535, Spec, 

 juv. 



insperatus, Allen, Bull. Am. Mus. Nat. Hist., 1894, p. 347. 



Type locality. Sawatch Pass (Cochetopa Pass), Rocky Mountains, 

 Colorado, 



