XIV CONTENTS 



Page 



Key to the orders of mammals in the United States 254 



Order i. Marsupialia 254 



Suborder Polyprotodontia 255 



Family Didelphyidae (Opossums) 255 



Order 2. Edentata 256 



Family Dasypodidte (Armadillos) 256 



Order 3. Sirenia 256 



Family Trichechidae (Manatees) 256 



Order 4. Insectivora 256 



Family i. Talpidse (Moles) 257 



Family 2. Soricidae (Shrews) 260 



Order 5. Chiroptera (Bats) 265 



Suborder Microchiroptera 265 



Family i. Phyllostomidae 265 



Family 2. Vespertilionidse 267 



Family 3. Molossidae 272 



Order 6. Carnivora 273 



Family i. Ursidae (Bears) 273 



Family 2. Canidae (Dogs; wolves; foxes) 274 



Family 3. Procyonidas (Racoons) 279 



Family 4. Mustelidae 280 



Subfamily I. Mustelinag (Weasels; minks) 281 



Subfamily 2. Mephitinae (Skunks) 287 



Subfamily 3. Melinas (Badgers) 291 



Subfamily 4. Lutrinae (Otters) 292 



Family 5. Felida; (Cats) 293 



Order 7. Pinnipedia (Seals) 296 



Family i. Otariidie 296 



Family 2. Phocidas 297 



Orders. Rodentia (Rodents) 298 



Family i. Muridae (Rats; mice) 298 



Subfamily i. Murinas (House-rats and mice) 299 



Subfamily 2. Cricetina; (Field mice; wood mice) 299 



Subfamily 3. Neotominte (Wood rats) 310 



Subfamily 4. Microtinse (Meadow mice; muskrats) 313 



Family 2. Geomyidae (Pocket gophers) 323 



Family 3. Heteromyida3 (Pocket mice; kangaroo ratsj 328 



Family 4. Zapodidae (Jumping mice) 333 



Family 5. Erethizontidae (Porcupines) 335 



Family 6. Aplodontiidae (Mountain beavers) 336 



Family 7. Sciuridae (Squirrels; marmots) 336 



Family 8. Castoridas (Beavers) 353 



Family 9. Leporidae (Rabbits; hares) 354 



Order 9. Ungulata (Hoofed animals) 361 



Suborder Artiodactyla 361 



Division i. Suina (Pigs) 361 



Family Tayassuidae (Peccaries) . 362 



Division 2. Ruminantia 362 



Subdivision i. Cervina (Deer) 362 



Family Cervidae 362 



Subdivision 2. Cavicornia 366 



Family i. Antilocapridae (Prong-horn antelopes) 366 



