TABLE OF CONTENTS. 



Page. 



List of illustrations vii 



Introduction 1 



Genus Chordeiles 3 



Synonymy 3 



Diagnosis 3 



Generic characters 3 



Type 3 



Geographical distribution 4 



Faunal distribution 4 



Variance in generic characters 4 



Relationships 6 



Phylogeny 12 



Sequence of forms 13 



Species and subspecies 15 



Recognition of subspecies 16 



Identification of specimens — 17 



Variation 18 



General habits 19 



History 19 



Nomenclature 20 



Literature 21 



Key to species and subspecies 22 



Chordeiles virginianus 26 



Synonymy 26 



Specific characters (adult male) 26 



Adult female 27 



First autumn plumage 27 



Juvenal plumage 27 



Natal plumage 27 



Seasonal variation 27 



Molt 28 



Individual variation 28 



Geographical variation 28 



Geographical distribution 30 



Zonal distribution 30 



Phylogeny 31 



Migration 32 



Habits 33 



History 34 



Chordeiles virginianus virginianus 35 



Chordeiles virginianus hesperis 46 



Chordeiles virginianus sennetti 52 



V 



