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TABLE OF CONTENTS
| Page | ||
| Part I. The Origin of Species | 7 | |
| The Taxonomic Method | 8 | |
| Basis of Present Study | 11 | |
| The Species Concept | 17 | |
| Mutations | 25 | |
| Physiologic Species | 37 | |
| The Isolation of Species | 49 | |
| Hybridization | 55 | |
| Phylogenetic History | 61 | |
| Part II. Systematic Data | ||
| Subgenus Cynips | 87 | |
| Subgenus Antron | 180 | |
| Subgenus Besbicus | 222 | |
| Subgenus Philonix | 242 | |
| Subgenus Atrusca | 276 | |
| Subgenus Acraspis | 306 | |
| Appendices | ||
| Acknowledgments | 431 | |
| Names Pre-occupied in Cynips | 433 | |
| Excluded Species | 446 | |
| Nomenclatorial Data | 456 | |
| General Bibliography | 457 | |
| Bibliography on Cynips | 460 | |
| Key to Described Cynips | 482 | |
| Checklist | 496 | |
| Plates | 502 | |
| Index | 573 | |
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