CONTENTS. 



INTRODUCTION xi 



BlllLIOGlCAPHY 1 



DESCRIPTIONS OF GENERA AND SI'KCIKS OF FOSSIL BUTTERFLIES 



NEORINOPIS 9 



1. Neoriuopis sepulta 14 



LETHITES 34 



2. Lethites Reynesii 37 



EUOONIA 40 



3. Eugonia atava 41 



MYLOTHRITES 44 



4. Mylothrites Pluto 45 



COLIATES ". 51 



5. Collates Proserpina 52 



PONTIA 53 



6. Pontia Freyeri 54 



THAITES 57 



7. Thaites Ruminiana 60 



THANATITES 62 



8. Thanatites vetula 63 



PAMPHILITES . 66 



9. Pamphilites abdita 68 



COMPARATIVE AGE or FOSSIL BUTTERFLIES 70 



PROBABLE FOOD PLANTS OF TERTIARY CATERPILLARS 71 



PRESENT DISTRIBUTION OF BUTTERFLIES MOST NEARLY ALLIED TO FOSSIL SPECIES 76 



GENERAL RESUME, WITH NOTICE OF UNDETERMINED FORMS 83 



FOSSIL INSECTS ERRONEOUSLY REFERRED TO BUTTERFLIES 88 



EXPLANATION OF THE PLATES AND WOOD CUTS 97 



