4 CONTENTS 



ORDER UNGULATA. HOOFED MAMMALS 57 



Family Cervidas. Deer, Moose, Elk, Caribou 58 



Key to the Genera 59 



Key to the Species ..... . ...... . . 59 



Family Bovidae. Bison, Oxen, Sheep, etc 86 



ORDER GLIRES. GNAWING MAMMALS 97 



Key to the Suborders and Families " . 98 



Family Sciuridae. Squirrels, Woodchucks, etc 98 



Key to the Genera . . . . . 99 



Key to the Species ^.-,. 99 



Subfamily Pteromyinae. Flying Squirrels . . . . . .102 



Subfamily Sciurinse. Squirrels, Chipmunks, etc 108 



Subfamily Marmotinae. Prairie Squirrels, Woodchucks, etc. . 137 



Family Castoridae. Beavers 158 



Family Muridae. Rats and Mice . . . ., 171 



Key to the Genera 171 



Key to the Species 173 



Subfamily Murinae. Old World Rats and Mice . . . .176 

 Subfamily Cricetinag. White-footed Mice, Cotton Mice, etc. . 183 



Key to the Species ' 183 



Subfamily Neotominse. Wood Rats 204 



Subfamily Microtinae. Meadow Mice or Voles, Lemming 



Mice, and Muskrats . . . . t 208 



Key to the Subgenera and Species of M icrotus 213 



Family Geomyidas. Pocket Gophers . .. . .. . .239 



Family Zapodidae. Jumping Mice . . 246 



Subfamily Zapodinae. American Jumping Mice .... 246 



Family Erethizontidas. American Porcupines 253 



Subfamily Erethizontinae. American Porcupines . . . .254 



Family Leporidas. Hares and Rabbits . . . ...-*. -259 



Key to the Genera 261 



Key to the Species . . . 261 



ORDER FER.E. FLESH EATERS . . . 275 



Key to the Families ' 277 



Family Felidas. The Cats . . ..'..'. '..'.-. -277 

 Subfamily Felinas. Panthers, Lynx, Wild Cat, etc. . . .279 



Key to the Genera . .279 



Key to the Species , 279 



Family Canidae. Wolves and Foxes 296 



Key to the Genera . 298 



Key to the Species 299 



Family Mustelidae. Otters, Minks, Weasels, Skunks, Badgers, etc. 327 



