XII CONTENTS. 



Order Rodentia — Continued. Page. 



Family Heteromyidse 252 



Subfamily Heteromyinse 252 



Genus Heteromys Desmarest 252 



Subgenus Heteromys Desmarest 252 



Subgenus Xylomys Merriam 253 



Genus Liomys Merriam 254 



Genus Perognathus Wied 260 



Subgenus Perognathus Wied 260 



Subgenus Chaetodipus Merriam 266 



Subfamily Dipodomyinse 272 



Genus Perodipus Fitzinger 272 



Genus Dipodomys Gray 276 



Genus Microdipodops Merriam 280 



Family Zapodidye 280 



Subfamily Zapodinse 280 



Genus Zapus Coues 280 



Genus Napseozapus Preble 283 



Family Octodontidse 284 



Subfamily Loncherinee 284 



Genus Loncheres Illiger 284 



Genus Proechimys Allen 285 



Genus Hoplomye Allen 285 



Subfamily Capromyinae 286 



Genus Capromys Desmarest 286 



Subgenus Capromys Demarest 286 



Subgenus Geocapromys Chapman 287 



Genus Plagiodontia F. Cuvier 287 



Family Dasyproctidee 287 



Genus Dasyprocta Illiger 287 



Genus Agouti Lacepede 289 



Family Erethizontidse 289 



Subfamily Erethizontinfe 289 



Genus Erethizon 289 



Genus Coendou 290 



Family Aplodontiidse 291 



Genus Aplodontia Richardson 291 



Family Sciuridse 292 



Genus Marmota Blumenbach 292 



Genus Cynomys Rafinesque 294 



Genus CitellusOken 295 



Genus Eutamias Trouessart ^ 306 



Genus Callospermophilus Merriam 315 



Genus Ammospermophilus Merriam 316 



Genus Tamias Illiger 318 



Genus Sciurus Linnaeus 319 



Subgenus Tamiasciurus Allen 319 



Subgenus Baiosciurus Nelson 324 



Subgenus Sciurus Linnseus 325 



Subgenus Guerlinguetus Gray 334 



Genus Microsciurus Allen 338 



Genus Syntheosciurus Bangs 338 



Family Petauristida? 339 



Genus Sciuropterus F. Cuvier 339 



Subgenus Glaucomys Thomas 339 



