CONTENTS 



Page 



Subfamily Palaeolaginae 142 



Genus Ronierolagus Merriam . . 142 



Subfamily Leporinae 143 



Genus Lepus Linnaeus 143 



Subgenus Lepus Linnaeus . . . 143 



Subgenus MacrotoIagusMearns. 152 



Genus Sylvilagus Gray 159 



Subgenus Sylvilagus Gray . . . 159 



Subgenus Tapeti Gray .... 176 

 Subgenus Paludilagus Hersb- 



kovitz 177 



Order Rodentia 178 



Suborder Sciuromorpha 178 



Superfamily Aplodontoidea .... 178 



Family Aplodontiidae 178 



Genus Aplodontia Richardson . . 178 



Superfamily Sciuroidea 180 



Family Sciuridae 180 



Subfamily Sciurinae 180 



Genus Marmota Blumenbacb . . 180 



Subgenus Marmotops Pocock . 181 



Genus Cynoinys Rafinesque . . . 187 



Subgenus Cynomys Rafinesque . 188 



Subgenus Leucocrossuromys 



Hollister 188 



Genus Citellus Oken 190 



Subgenus Citellus Oken .... 190 



Subgenus Ictidomys J. A. Allen . 197 

 Subgenus Poliocitellus A. H. 



Howell 203 



Subgenus Otospermopbilus 



Brandt 204 



Subgenus Notocitellus A. H. 



Howell 207 



Subgenus Ainmosperinophilus 



Merriam 208 



Subgenus Xerospermophilus 



Merriam 211 



Subgenus Callospermopbilus 



Merriam 212 



Genus Tamias llliger 216 



Genus Eutamias Trouessart . . . 218 

 Subgenus Neotamias A. II. 



Howell 219 



Genus Sciurus Linnaeus .... 237 

 Subgenus Neosciurus Troues- 

 sart 237 



Subgenus Hesperosciurus Nel- 

 son 248 



Subgenus Otosciurus Nelson . . 249 

 Subgenus Parasciurus Troues- 

 sart 251 



Subgenus Guerlinguetus Gray . 256 



Genus Tamiasciurus Trouessart . 258 



Genus Microsciurus J. A. Allen . 266 



Genus Syntheosciurus Bangs . . 268 



Subfamily Pteromyinae 268 



Genus Glaucomys Thomas . . . 268 



Superfamily Geomyoidea 276 



Pago 



FarnUy Geomyidae 276 



Subfamily Geomyinae 276 



Genus Thomoinys Wied-Neuwied . 276 

 Subgenus Thomomys Wied- 

 Neuwied 276 



Subgenus Megascapheus Elliot . 332 



Genus Geomys Rafinesque . . . 332 



Genus Pappogeomys Merriam . . 340 



Genus Cratogeomys Merriam . . 341 



Genus Orthogeomys Merriam . . 347 



Genus Heterogeomys Merriam . 349 



Genus Macrogeomys Merriam . . 351 



Genus Zygogeomys Merriam . . 353 



Family Heteromyidae 354 



Subfamily Perognatbinae 354 



Genus Perognathus Wied-Neu- 

 wied 354 



Subgenus Perognathus Wied- 

 Neuwied 354 



Subgenus Chaetodipus Mer- 

 riam 369 



Subfamily Dipodomyinae 383 



Genus Dipodomys Gray .... 383 



Genus Microdipodops Merriam . 410 



Subfamily Heteromyinae 413 



Genus Heteromys Desmarest . . 413 



Subgenus Heteromys Desmarest . 41 3 



Subgenus Xylomys Merriam . 417 



Genus Liomys Merriam .... 417 



Superfamily Castoroidea 423 



Family Castoridae 423 



Genus Castor Linnaeus 423 



Suborder Myomorpha 429 



Superfamily Muroidea 429 



Family Cricetidae 429 



Subfamily Cricetinae 429 



Genus Oryzomys Baird 429 



Subgenus Oryzomys Baird . . 430 



Subgenus Oligoryzomys Bangs . 439 



Subgenus Melanomys Thomas . 441 



Genus Oecomys Thomas .... 441 



Genus Megalomys Trouessart . . 442 



Genus Neacomys Thomas .... 442 



Genus Nectomys Peters 443 



Subgenus Sigmodontoinys J. A. 



Allen 443 



Genus Rhipidomys Tschudi . . . 443 



Genus Tylomys Peters 443 



Genus Ototylomys Merriam . . . 445 



Genus Nyctomys Saussure . . . 446 



Genus Otonyclomys Anthony . . 447 



Genus Reilhrodontomys Giglioli . 447 

 Subgenus Rcith rod onto mys 



Giglioli 448 



Subgenus Aporodon A. 11. 



Howell 461 



Genus Peromyscus Gloger .... 466 

 Subgenus Haplomylomys Os- 

 good 466 



