VIII TABLE OF CONTENTS. 



Mammals of the Mexican Boundary Region — Continued. Page. 



Family Cervidie 169 



Genus Odocoileus 170 



Key to the Mexican Boundary forms of Odocoileus 171 



Odocoileus texanus 171 



couesi 175 



crooki 185 



hemionus canus 191 



eremicus 208 



californicus 211 



Genus Cervus ^ 213 



merriami 213 



Family Antilocaprid;e 220 



Genus Antilocapra 220 



americana mexicana 221 



Family Bovidee - 233 



Genus Ovis 233 



canadensis mexicanus 233 



gaillardi 240 



nelsoni 245 



Order Glires. 247 



Family Sciuridfe 247 



Key to the Sciuridse of the Mexican Boundary Line 247 



Genus Sciurus 248 



Key to Sciurus found on the Mexican Boundary Line, based on external 



characters • 248 



Key to Sciurus found on the Mexican Boundary Line, based on cranial 



and dental characters 248 



Sciurus a1)erti 250 



fremonti mogollonensis 256 



grahamensis 261 



mearnsi 262 



griseus anthonyi 264 



alleni 269 



apache 270 



arizonensis 273 



huachuca 277 



ruiiventer texianus 281 



Genus Eutamias 283 



Key to three species of the genus Eutamias 284 



Eutamias cinereicollis 284 



dorsalis 288 



merriami 295 



Genus Ammospermophilus 297 



Key to Ground-squirrels found on the Mexican Boundary Line, ])ased on 



external characters 298 



Ammospermophilus leucurup 299 



interpres 301 



harrisii 303 



saxicola 306 



Genus Callospermophilus 309 



lateralis 309 



bernardinus 313 



Genus Otospermophilus 314 



grammurus , 315 



buckleyi 323 



beechey i . 32 



