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