| Introduction | xi | | Bibliography | 1 | | Descriptions of genera and species of fossil butterflies | | | Neorinopis | 9 | | 1. Neorinopis sepulta | 14 | | Lethites | 34 | | 2. Lethites Reynesii | 37 | | Eugonia | 40 | | 3. Eugonia atava | 41 | | Mylothrites | 44 | | 4. Mylothrites Pluto | 45 | | Coliates | 51 | | 5. Coliates 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 of fossil butterflies | 70 | | Probable food plants of tertiary Caterpillars | 71 | | Present distribution of butterflies most nearly allied to fossil species | 76 | | General RÉsumÉ, with notice of undetermined forms | 83 | | Fossil Insects erroneously referred to butterflies | 88 | | Explanation of the plates and wood cuts | 97 |
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