CONTENTS. 



Page. 



Introduction 5 



Distribution, habits, and economic status 5 



Natural enemies 7 



Nomenclature 7 



Pelages and molts 9 



Material and acknowledgments 10 



Genus Cynomys 10 



List of species and subspecies with type localities 12 



Key to species and subspecies 12 



Subgenus Cynomys 12 



Subgenus Leucocrossuromys 23 



Tables of measurements 34 



Index 37 



3 



