CONTENTS 



Page 



Preface ^^^ 



Introduction 1 



Collateral studies 1 



Material studied 2 



Importations from the Tropics. 5 



Historical ^ 



Forms of District butterflies 7 



Nomenclature 16 



Faunal relations of the District of Columbia 17 



Relative occurrence and habitats 19 



General features of the District fauna 25 



The occurrence of butterflies in the District 27 



The succession of butterflies 32 



The end of the season 33 



Remarks and notes 39 



Pressure of population ^^ 



Butterflies and storms 49 



Extirpation of one butterfly by another 51 



Observations on butterfly migrations 52 



Suggestions for studying butterflies 57 



Key to the superfamilies of butterflies 62 



Superf amily Papilionoidea 62 



Family Nymphalidae 62 



Subfamily Satyrinae 63 



Genus Neonympha 63 



Neonympha eurytus 63 



Genus Satyrodes 65 



Satyrodes eurydice 65 



Genus Cercyonis 68 



Cercyonis alope alope 68 



Cercyonis alope maritima 71 



Subfamily Nymphalinae 71 



Genus Chlorippe 74 



Chlorippe celtis celtis 74 



Chlorippe clyton clytou 75 



Genus Basilarchia 76 



Basilarchia arthemis astyanax 76 



Basilarchia archippus archippus 78 



Genus Junonia 79 



Junonia lavinia coenia 79 



Genus Pyrameis °'* 



Pyrameis atalanta atalanta 84 



Pyrameis virginiensis °6 



Pyrameis cardui °° 



7 



