476 



U. S. P. R. R. EXP. AND SURVEFS ZOOLOGY GENERAL REPORT. 



List of specimens. 



HESPEROMYS MICHIGANENSIS. 



Prairie Mouse. 



Jtfus mic/tigonensis, AUD. & BACH. J. A. N. Sc. Phil. VIII, 11, 1842, 304, IB. N. Am. Quad. Ill, 1854, 326. 

 Ilesperomyi michiganensis, WAGNER, Wiegmann's Archiv, 1843, u, 51. 

 ?JV/us bairdii, HOT & KENNICOTT, Agricultural Report U.S. Patent Office for 1856, (1857,) 92; pi. xi. 



SP. CH. Smaller than //. /eucopus; ears and feet much smaller and shorter. Above, blackish brown; crown of the hea ! 

 almost black; sides of the adult with an intermixture of grayish yellow brown; a district dorsal wash of darker ; beneatl , 

 snowy white. Upper surface of fore and hind feet dusky to the base of the toes. Tail white beneath. Maximum length r f 

 head and body, usually 3.00; tail one inch to half an inch shorter; hind foot seldom exceeding 0.70; never 0.75. 



