CONTENTS. 



INTRODUCTION xi 



BIBLIOGRAPHY 1 



DESCRIPTIONS OK GENERA AND SPECIES OF FOSSIL BUTTERFLIES 



NBORINOPIS 9 



1. Nuorinopis scpulta 14 



LETHITES 34 



2. Lethites Reynesii 37 



EUGONIA 40 



3. Eugenia atava 41 



MYLOTIIIUTES 44 



4. MyloUuites Pluto 45 



COLIATES 51 



5. Collates Proserpina 52 



PONTIA 53 



6. Pontia Freyeri 54 



THAITES 57 



7. Thaites Ruminiana . . *. 60 



THANATITES 



8. Thanatites vetula 



PAMPHILITES 66 



9. Pamphilites abdita : 68 



COMPARATIVE AGE OF 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 



