CONTENTS IX 



Order Primates: Lemurs, marmosets, monkeys, apes, men — Continued. Page 



Family Lorisidae: Lorises 251 



Genus Nyciicebus Geoffrey 251 



Family Tarsiidae: Tarsiers 252 



Genus Tarsius Storr 252 



Order Rodentia: Rodents 253 



Family Aplodontiidae: Mountain-beavers 253 



Genus Aplodontia Richardson 253 



Family Bathyergidae: Sand moles 254 



Genus Ileliophobius Peters 254 



Family Castoridae: Beavers 254 



Genus Castor Linnaeus 254 



Family Chinchillidae: Chinchillas 256 



Genus Layostomus Brookes 256 



Family Cricetidae: Cricctine rats and mice 256 



Genus Akodon Meyen 256 



Genus Alticola Blanford 257 



Genus Aschizomys Miller 258 



Genus Baiomys True 258 



Genus Chelemys Thomas 259 



Genus Chraeomys Thomas 260 



Genus Clethrionomys Tilesius 260 



Genus Dicrostonyx Gloger 264 



Genus Euneomys Coues 265 



Genus Geoxus Thomas 265 



Genus Gerbillus Desmarest 265 



Genus Hesperomys Waterhouse 266 



Genus Hodomys Merriam 266 



Genus Holochilus Brandt 266 



Genus Hyperacrius Miller 266 



Genus Levimiscus Gloger 267 



Genus Lemmus Link 268 



Genus Lophiomys Dep^ret 269 



Genus Microtus Schrank __ 269 



Genus Myopus Miller 283 



Genus Neacomys Thomas 283 



Genus Nectomys Peters 284 



Genus Nelsonia Merriam 284 



Genus Neofiber True 284 



Genus Neoiovia Say and Ord 285 



Genus Neotomodon Merriam 298 



Genus Nyctomys Saussure 299 



Genus Ondatra Link 300 



Genus Onychomys Baird 301 



Genus Oryzomys Baird 304 



Genus Ototylomys Merriam 311 



Genus Peromyscus Gloger 311 



Genus Phenacomys Merriam 337 



Genus Phodopvs Miller 339 



Genus Pitijmys McMurtrie 339 



Genus Reithrodon Waterhouse 340 



Genus Reithrodontomys Giglioli 341 



Genus Rheomys Thomas 349 



Genus Rhipidomys Tschudi 350 



