3i6 



VERTEBRATE ANIMALS OF THE UNITED STATES 



M. pennsylvanicus (Ord.)- Common field or meadow mouse (Fig. 

 170). Color chestnut brown above, darker middorsally, grayish 

 beneath; feet brownish; length 180 mm. ; tail 50 mm.; hind foot 21 mm.; 

 mammas 8: eastern and central States; southward to 

 North Carolina; westward to the Rockies; north- 

 ward to Hudson Bay; common in meadows. 



Subspecies of M. pennsylvanicus 



M. p. pennsylvanicus (Ord.). Transition zone 

 from the Atlantic coast to the Great Plains. 



M. p. nigrans Rhoads. Larger, with notably 

 larger hind feet and darker coloration: coast region of 

 northern North Carolina and southern Virginia. 



M. p. fontigenus Bangs. Size smaller: eastern 

 Canada, Hudsonian zone. 



M. p. acadicus Bangs. Smaller and paler: Nova 

 Scotia and Prince Edwards Island. 



M. p. modestus (Baird). Color paler, more yel- 

 lowish: Rocky Mountains and western plains from 

 New Mexico to British Columbia; Transition zone. 



M. breweri (Baird). Color pale grayish; fur long 

 and coarse; length 182 mm.; tail 54 mm.; hind foot 

 22 mm.: Muskeget Island, Massachusetts. 



M. ochrogaster (Wagner) . Prairie meadow mouse. 

 ViG. 110.— Microtus Qq\q^ grizzly gray; belly fulvous; fur coarse; length 



pennsylvanicus {after o j o j ■> j ^ •> 7 o 



Stone b' Cram) . 127 mm.; tail 32 mm.; hind foot 20 mm.; mammae 



6: southern Wisconsin to Oklahoma and eastern 



Kansas and Nebraska ; eastward to Indiana; common in dry prairie land. 



M. chrotorrhinus (Miller). Color glossy brown; nose, ears and rump 

 conspicuously yellowish; length 165 mm. ; tail 45 mm. ; hind foot 19 mm. : 

 Mount Washington, the Catskills and into Canada; Hudsonian zone. 



M. haydeni (Baird). Color hght gray; belly silvery white; length 

 180 mm.; tail 47 mm.; hind foot 22 mm.: western South Dakota to 

 Kansas; westward into southern Montana, Wyoming and eastern 

 Colorado; in dry prairies. 



M. longicaudus (Merriam). Color dark brown above, whitish 

 below; length 180 mm.; tail 65 mm.; hind foot 21 mm.: Boreal cap of 

 Black Hills. 



M. ludovicianus Bailey. Color dark gray above, dark buff below: 

 length 164 mm.; tail 33 mm.; hind foot 19 mm.: coast prairies of 

 Louisiana. 



