Family Sciuridae
_Spermophilus mexicanus parvidens_ Mearns 421
_Spermophilus spilosoma oricolus_ Alvarez 422
_Spermophilus variegatus couchii_ Baird 422
_Sciurus aureogaster aureogaster_ Cuvier 423
_Sciurus deppei negligens_ Nelson 424
_Sciurus alleni_ Nelson 424
_Glaucomys volans herreranus_ Goldman 425
Family Geomyidae
_Geomys personatus personatus_ True 425
_Geomys tropicalis_ Goldman 426
_Heterogeomys hispidus negatus_ Goodwin 427
_Cratogeomys castanops planifrons_ Nelson and Goldman 428
_Cratogeomys castanops tamaulipensis_ Nelson and Goldman 428
Family Heteromyidae
_Perognathus merriami merriami_ J. A. Allen 429
_Perognathus hispidus hispidus_ Baird 429
_Perognathus nelsoni nelsoni_ Merriam 430
_Dipodomys ordii durranti_ Setzer 431
_Dipodomys ordii parvabullatus_ Hall 431
_Dipodomys ordii compactus_ True 431
_Dipodomys merriami atronasus_ Merriam 432
_Liomys irroratus alleni_ (Coues) 433
_Liomys irroratus texensis_ Merriam 433
Family Castoridae
_Castor canadensis mexicanus_ V. Bailey 434
Family Cricetidae
_Oryzomys palustris aquaticus_ J. A. Allen 435
_Oryzomys palustris peragrus_ Merriam 435
_Oryzomys melanotis carrorum_ Lawrence 436
_Oryzomys melanotis rostratus_ Merriam 437
_Oryzomys alfaroi huastecae_ Dalquest 437
_Oryzomys fulvescens fulvescens_ (Saussure) 438
_Oryzomys fulvescens engracie_ Osgood 438
_Reithrodontomys megalotis hooperi_ Goodwin 438
_Reithrodontomys fulvescens griseoflavus_ Merriam 438
_Reithrodontomys fulvescens intermedius_ J. A. Allen 439
_Reithrodontomys fulvescens tropicalis_ Davis 439
_Reithrodontomys mexicanus mexicanus_ (Saussure) 440
_Peromyscus maniculatus blandus_ Osgood 440
_Peromyscus melanotis_ J. A. Allen and Chapman 440
_Peromyscus leucopus texanus_ (Woodhouse) 441
_Peromyscus boylii ambiguus_ Alvarez 443
_Peromyscus boylii levipes_ Merriam 443
_Peromyscus pectoralis collinus_ Hooper 444
_Peromyscus pectoralis eremicoides_ Osgood 445
_Peromyscus melanophrys consobrinus_ Osgood 445
_Peromyscus difficilis petricola_ Hoffmeister and de la Torre 446
_Peromyscus ochraventer_ Baker 446
_Baiomys taylori taylori_ (Thomas) 447
_Onychomys leucogaster longipes_ Merriam 447
_Onychomys torridus subrufus_ Hollister 448
_Sigmodon hispidus berlandieri_ Baird 449
_Sigmodon hispidus solus_ Hall 450
_Sigmodon hispidus toltecus_ (Saussure) 450
_Neotoma albigula subsolana_ Alvarez 450
_Neotoma angustapalata_ Baker 451
_Neotoma micropus littoralis_ Goldman 453
_Neotoma micropus micropus_ Baird 453
_Microtus mexicanus subsimus_ Goldman 454