12 
LIST OF SPECIES. 
Page. 
101. Spermophilus firanklini, Eich.—Gray Gopher.—Northern Illinois and Wisconsin, 
and to Minnesota and the Saskatchewan. 314 
102. —Spermophilus tereticauda, Baird, (n. s.)—Bound-Tailed Spermophile.—Fort 
Yuma, Cal........ 315 
103. —Spermophilus trideeem-lineatus, Aud. & Bach.—Striped Gopher: Prairie Squir¬ 
rel.—Eastern Michigan to the plains of the Missouri, and south to 
Bed Biver, Arkansas, and Fort Thorn, N. M. 316 
104. —Spermophilus mexicanus, Wagner.—Mexican Ground Squirrel.—Bio Grande of 
Texas and the Pecos, and south into Mexico. 319 
105. —Spermophilus spilosoma, Bennett.—Sonora Ground Squirrel.—Fort Staunton, N. 
M. and El Paso, to Chihuahua, and west to the Gulf of California.... 321 
106. —Spermophilus parryi, Bich.—Parry’s Marmot.—Shores and islands of Arctic seas; 
island of Arikamtchitchi, on the Asiatic side of Behring’s Straits. 323 
107. —Spermophilus richardsonii.—Yellow Gopher.—Sault St. Marie, Mich., and west 
to the Bocky Mountains north of Upper Missouri. 325 
108. —Spermophilus townsendii, Bach.—Townsend’s Spermophile.—Bocky Mountains 
to the north. 326 
26. CYNOMYS, Baf. . 329 
109. —Cynomys ludovicianus.—Prairie Dog.—Milk river and Upper Missouri; west 
towards the Bocky Mountains ; south to Bed Biver ; southwest to the 
Upper Bio Grande, and a short distance into Sonora ?. 331 
110. —C 3 niomys gumiisomi, Baird (n. s.)—Short-Tailed Prairie Dog.—Coochetope 
Pass to Lodge Pole Creek, in or near the Bocky Mountains. 335 
27. ABCTOMYS, Schreber. 348 
111 . —Arctnmya monax, Gmelin.—Woodchuck ; Ground Hog.—Massachusetts to Wis¬ 
consin and Canada ; south to Virginia. (To South Carolina, Aud. 
&Bach.). ... 339 
112. —^Arctomys flaviventer, Bachman.—Yellow-Footed Marmot.—Black Hills, Neh.... 343 
28. APLODONTIA, Bich. 350 
113. —^Aplodontia leporina, Bich.—Sewellel; Showt’l.—Puget’s Sound... 353 
29. CASTOE, Linn. 355 
114. —Castor canadensis, Kuhl.—American Beaver.—Throughout the entire area of 
North America. 355 
