CONTENTS. XI 



Order Pinnipedia — Continued. Page. 



Family Odobenidse 167 



Genus Odobenus Brisson 167 



Order Primates 167 



Family Callitrichidie 167 



Genus ffidipomidas Reichenbach 167 



Family Alouattidse 168 



Genus Alouatta Lac^pMe 168 



Family Aotid^e 169 



Genu? Aotus Humboldt 169 



Family Cebidse 169 



Subfamily Cebinee 169 



Genus Cebus Erxleben 169 



Subfamily Atelinae 170 



Genus Ateles E. Geoffrey 170 



Family Saimiridae 171 



Genus Saimiri Voigt 171 



Family Lasiopygidse 172 



Subfamily Lasiopyginse 172 



Genus Lasiopyga Illiger 172 



Family Hominidse 172 



Genus Homo Linnaeus 172 



Order Rodentia 173 



Superfamily Sciuroidae 173 



Family Sciuridae 173 



Subfamily Sciurinae 173 



Genus Marmota Bhimenbach 173 



Genus Otospermophilus Brandt 179 



Genus Callospermopbilus Merriam 182 



Genus Citellus Oken . -r 184 



Genus Ammospermophilus Merriam 194 



Genus Cynomys Rafinesque 196 



Subgenus Cynomys Rafinesque 196 



Subgenus Leucocrossuromys Hollister 197 



Genus Eutamias Trouessart 199 



Genus Tamias Illiger 208 



Genus Sciurus Linnaeus 209 



Subgenus Tamiasciurus Allen 209 



Subgenus Baiosciurus Nelson 214 



Subgenus Sciiirus Linnaeus 215 



Subgenus Guerlinguetus Gray 225 



Genus Microsciurus Allen 229 



Genus Syntheosciurus Bangs 230 



Subfamily Pteromyinae 230 



Genus Glaucomys Thomas 230 



Family Geomyidae 236 



Subfamily Geomyinae 236 



Genus Thomomys Wied 236 



Subgenus Thomomys Wied 236 



Subgenus Megascapheus Elliot 254 



Genus Geomys Rafinesque 254 



Genus Pappogeomys Merriam 258 



Genus Cratogeomys Merriam 258 



Genus Platygeomys Merriam 260 



