IX 



ARTICLE IV. THE ZYGOPTERA, OR DAMSEL-FLIES, OF ILLINOIS. page 



BY PHILIP GARMAN, Ph.D. (16 Plates) June. 1917 411-587 



Introduction 411 



Acknowledgments 413 



Morphology 413 



■Nymph 413 



Adult 423 



Life history and habits 438 



Egg 438 



Nymph 439 



Adult . . .' : 444 



History of the Zygoptera 446 



Paleontology 446 



Ontogeny 450 



Phylogenetic comparison of Zygoptera and Anisoptera 453 



Egg 454 



Nymph 455 



Adult 457 



Classification 464 



Agrionidse 466 



Agrioninas 466 



Coenagrionidae 476 



Key to subfamilies 476 



Lestinae 477 



Coenagrionina? 499 



Bibliography 577 



Nymphs 578 



Adults 580 



Index to genera and species 5S4 



Abbreviations used in lettering plates 586 



