CONTENTS 



PAGE 



Introduction 411 



Morphology 413-438 



Nymph 413 



Adult 423 



Life history antj habits 438-445 



Egg 438 



Nymph • 439 



Adult 444 



History of the' Zygoptera 446-464 



Paleontology 446 



Ontogeny 450 



Phylogenetic comparison of Zygoptera and Anisoptera 453 



Classification 464-577 



Family Agrionidae 466 



Subfamily Agrioninae 466 



Family Coenagrionidae 476 



Subfamilies: — 



Lestinae 477 



Coenagrioninae 499 



Bibliography 577 



Index to genera and species 584 



Abbreviations used in lettering plates 586 



