CONTENTS 11 



Peromyscus maniculatus bairdi, Prairie White- 

 footed Mouse 14g 



Peromyscus leucopus noveboracensis, Northern 



White-footed Mouse .' 148 



Genus R'eithrodontomys .148 



Reithrodontomys- megalotis dychei, Prairie 



Harvest Mouse 148 



Subfamily Microtinae 148 



Genus Microtus 148 



Key to Species of Microtus 149 



Microtus pinetorum nemoralis, Woodland Vole 149 



Microtus ochrogaster ochrogaster, Prairie 



Meadow Mouse 149 



Microtus pennsylvanicus pennsylvanicus, 



Meadow' Mouse 149 



Genus Fiber . . ^ 149 



Key to Subspecies of Fiber 150 



Fiber zibethicus zibethicus, Common Muskrat ..150 



Fiber zibethicus cinnamominus, Great Plains 



Muskrat 150 



Genus Synaptomys 150 



Synaptomys cooperi gossii, Goss' Lemming 



Mouse 150 



Family Geomyidae, Pocket Gophers 150 



Genus Geomys 150 



Geomys bursarius bursarius, Pocket Gopher 150 



Family Zapodidae, Jumping Mice 151 



Subfamily Zapodinae 151 



Genus Zapus 151 



Key to Subspecies of Zapus 151 



Zapus hudsonius hudsonius, Hudson Bay 



Jumping Mouse 151 



Zapus hudsonius campestris, Prairie Jumping 



Mouse ' 151 



Family Erethizontidae, American Porcupines 151 



Subfamily Erethizontinae 151 



Genus Erethizon . 151 



Erethizon dorsatum dorsatum, Canada Porcu- 

 pine 152 



Suborder Duplicidentata 152 



Family Leporidae, Hares and Rabbits 152 



Key to the Genera of Leporidae 152 



Genus Lepus 153 



Key to Species of Lepus 153 



Lepus americanus phaeonotus, Minnesota 



Varying Hare 153 



Lepus townsendi campanius, White-tailed Jack 

 Rabbit . 153 



