CONTENTS. 



Page, 



Introduction 7 



History and material 7 



Distribution 10 



Habits and economic status 10 



Food 11 



Pelages 12 



Genus Reithrodontomys 13 



Generic characters 13 



List of species and subspecies, with type localities 14 



Key to species and subspecies 16 



Subgenus Reithrodontomys 19 



Subgenus ^porocZon 63 



Table of cranial measurements 81 



Index 95 



5 



