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 
Sub genus Antron 180 
Sub genus Besbicus 222 
Subgenus Philom.c 242 
Sub genus A trusca 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 
( 6 ) 
