LIST OF ILLUSTRATIONS 



TEXT FIGURES 



1. Adult Zygopteron (Lestes vigilax) showing parts. 



2. Adult Anisopteron (Anax Junius) showing parts, (Somatochlora 



linearis) portion of wing. 



3. Heads of Odonata viewed from above, (a) Zygoptera, (b) Anisoptera 



( Ophiogomphus ) . 



4. Wing veins of fossil damsel flies, (a) Kennedya mirabilis Till. Tar- 



sophlebiopsis mnyi Till. (c) Chromagrion conditum, a modern 

 species for comparison. 



5. Nymph of Zygopteron {Ischnura verticalis) showing parts. 



6. Nymph of Anisopteron (Basiaeschna Janata) showing parts. 



7. Labia of dragonfly nymphs, various species. 



8. Diagram of net for collecting nymphs. 



9. Front wings of different genera of Zygoptera adults. 



10. Anal appendages of Lestes, Agrion, Argia and Amphiagrion. 

 [I. Anal appendages of Enallagma, Ischnura, Anomalagrion and Chro- 

 magrion. 

 12. Mesostigmal plates of the females of Enallagma, Argia and Nehallenia, 

 and the last four abdominal segments of Enallagma species. 



Cordulegaster species, structural details and color patterns. 



Structural details of Ophiogomphus species. 



Structural details of Ophiogoviphus m,ainensis Packard. 



Structural details of Ophiogomphus howei B. 



Abdomens of Gomphus nymphs. 



Last four segments of Gomphus spicatus and G. ventricosus. 



Tip of abdomen of Gomphus ventricosus. 



Vulvar lamina of Gomphus species. 



Gomphus, accessory genitalia and anal appendages of the males and 

 occipita of the females. 



Gomphus, color pattern of meso- and metathorax. 



Gomphus fratemus, cra-ssus and externus, structural details after Cal- 

 vert. 



Tachopteryx thoreyi, ovipositor and anal appendages ; Anax longipes, 

 A. Junius, Basiaeschna Janata, Hagenius brevistylus, Gomphaeschna 

 furcillata, and Cordulegaster maculatus, anal appendages of the male. 



Aeshna umbrosa, accessory genitalia. 



Aeshna umbrosa, ovipositor. 



Aeshna caerulia septentrionalis, structural details. 



A. juncea, structural details. 



A. canadensis, structural details. 



A. clepsydra, structural details. 



A. eremita, structural details. 



A. interrupta, structural details. 



A. tuberculifera, structural details. 



A. verticalis. structural details. 



