334 VERTEBRATE ANIMALS OF THE UNITED STATES 



progress is made by leaps, which may be lo feet in length; they hiber- 

 nate in the winter; i or 2 litters annually of 5 or 6 young each. 



Key to the Species of Zapus 



ai In the eastern and central States Z. hudsonius. 



3.2 In the Rocky Mountains and Pacific States. 



bi Lower parts not much suffused with the color of the sides. 

 Ci Size large; length over 240 mm. 



di Ear conspicuously bordered with whitish Z. princeps. 



d2 Ear never conspicuously bordered with whitish Z. trinotatus. 



C2 Size small; length under 230 mm Z. montanus. 



Z. pacificus. 

 ho Lower parts much suffused with the color of the sides Z. orarius. 



Z. hudsonius (Zimmermann) . Meadow jumping-mouse. Body 

 about the size of a house-mouse; color yellowish brown above, with a 

 broad dark dorsal band; white beneath; tail tipped with brown and 

 bicolor; feet white; length 209 mm.; tail 124 mm.; hind foot 30 mm.: 

 eastern and central States; westward to the Rockies and Alaska. 



Subspecies of Z. hudsonius 



Z. h. hudsonius (Zimm.). Hudson Bay to New Jersey, and in the 

 mountains to North Carolina; west to Iowa and Missouri and Alaska. 



Z. h. americanus (Barton). Size small; length 191 mm.: from 

 Raleigh, N. C. along the coastal plain to Connecticut. 



Z. h. campestris Preble. Size large; length 222 mm.: Great Plains 

 from Manitoba to Nebraska; westward to Colorado and Wyoming. 



Z. pri?iceps Allen. Color yellowish brown, with a broad dark dorsal 

 band; length 245 mm.; tail 147 mm.; hind foot 32 mm.: Rocky Moun- 

 tain region from New Mexico to Alberta. 



Subspecies of Z. princeps 



Z. p. oregonus Preble. Color lighter; length 250 mm.: Blue Moun- 

 tains, Oregon. 



Z. trinotatus Rhoads. Color dark ochraceous buff on the sides; 

 dorsal band very distinct; length 248 mm.; tail 153 mm.; hind foot ^t, 

 mm. : British Columbia to Humboldt Bay. 



Subspecies of Z. trinotatus 



Z. t. alleni Elliot. Tip of tail often white: Sierras from Mount 

 Shasta to Kern River. 



