| 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 |
