CONTENTS. XTIl 



Order Rodentia — Continued. 



Superfamily Muroidae — Continued. 

 Family Cricetidse — Continued. 



Subfamily Cricetinae — Continued. Pago. 



Genus Neotoma Say and Ord 376 



Subgenus Neotoma Say and Ord 376 



Subgenus Homodontomys Goldman 388 



Subgenus Teonoma Gray 390 



Genus Hodomys Merriam 393 



Genus Xenomys Merriam 393 



Subfamily Microtina? 393 



Genus Synaptomys Baird 393 



Subgenus Synaptomys Baird 394 



Subgenus Mictomys True 394 



Genus Lemmus Link 396 



Genus Dicrostonyx Gloger 397 



Subgenus Dicrostonyx Gloger 397 



Subgenus Misothermus Hensel 397 



Genus Phenacomys Merriam 398 



Genus E votomys Coues 401 



Genus Microtus Schrank 404 



Subgenus Microtus Schrank 405 



Subgenus Aulacomys Rhoads 418 



Subgenus Pedomys Baird 419 



Subgenus Orthriomys Merriam 420 



Subgenus Herpetomys Merriam 420 



Subgenus Chilotus Baird 421 



Genus Lagurus Gloger 422 



Subgenus Lemmiscus Thomas 422 



Genus Pitymys McMurtrie 423 



Genus Neofiber True 424 



Genus Ondatra Link 425 



Family Muridse 428 



Subfamily Murinse 428 



Genus Rattus G. Fischer 428 



Subgenus Epimys Trouessart 428 



Subgenus Rattus G. Fischer 428 



Genus Mus Linnreus 429 



Superfamily Dipodoidse 429 



Family Aplodontiidse 429 



Genus Aplodontia Richardson 429 



Family Zapodidae 432 



Subfamily Zapodinte 432 



Genus Zapus Coues 432 



Genus Napseozapus Preble 435 



Superfamily Hystricoida? 436 



Family Erethizontidse 436 



Genus Erethizon F. Cuvier 436 



Genus Coendou Lacepede 437 



Family Echimyidse 438 



Subfamily Echimyinae 438 



Genus Hoplomys Allen 438 



Genus Proechimys Allen 438 



