CONTENTS. 



«^ 



Page. 



Foreword 182 



Introduction 185 



General description of the ponds and their environment 186 



Abundance of dragonflies and damselflies 188 



Relative abundance of different species 189 



Life history of an odonate 192 



Mouth parts of odonate nymphs 193 



Mouth parts of odonate imagos 198 



Economic relations between odonates and fishes 200 



Food of odonate nymphs 201 



Enemies of odonate nymphs 209 



Food of odonate imagos 211 



Enemies of odonate imagos 222 



Odonate nymphs as fish food 225 



Odonate imagos as fish food 231 



Stocking the fishpond 232 



Experiments in hatching odonate eggs 238 



General conclusions 246 



Annotated list of dragonflies and damselflies obtained near Fairport, Iowa 248 



Bibliography 260 



Index , I 



183 



