TABLE OF CONTENTS. 



VII 



List of illustrations 



Introduction _ 



Genus Chordeiles 



Synonymy ^ 



Diagnosis „ 



Generic characters 



Type - 4 



Geographical distribution 



Faunal distribution 



Variance in generic characters 



Relationships 



Phylogeny ^^ 



Sequence of forms _ 



Species and subspecies 



Recognition of subspecies 



Identification of specimens 



. . io 



Variation , „ 



General habits ^^ 



History 2o 



Nomenclature 



Literature no 



Key to species and subspecies 



Chordeiles virginianus 



Synonymy 



Specific characters (adult male) 



Adult female 



First autumn plumage " 



Juvenal plumage ^7 



Natal plumage 



Seasonal variation 



Molt 28 



Individual variation 



Geographical variation 



Geographical distribution 



Zonal distribution 



Phylogeny 32 



Migration 00 



Habits „ - 



History 05 



Chordeiles virginianus virginianus 



Chordeiles virginianus hesperis 



Chordeiles virginianus sennetti 



V 



