152fZ PHILIP p. CALVERT. 



TABLE OF CONTENTS. 



Part I.— A General Account of the Odonata. 



PAGE 



Names aud defiuitiou 153 



1. Structure of the Imago. 



Skeletou 154 



Muscles 171 



Alimentary canal 176 



Excretory organs i 178 



Circulatory apparatus 178 



Eespiratory apparatus 178 



Nervous system 181 



Reproductive organs . 184 



Oviposition 188 



2. Development of the Odonata. 



Embryonic development 190 



Nymph 195 



3. Distribution of the Odonata. 



Conditions determining distribution 204 



Geographical distribution 206 



Geological distribution 209 



4. Relationships of the Odonata. 



Relationships to other insects 210 



Relationships of the Odonate groups to each other 211 



Note on the preservation of specimens 214 



Bibliography 215 



Part n.— Catalogue of the Odonata of the Vicinity of Philadelphia. 



Characters of the major groups 219 



Characters of the genera (imagos only) J20 



Systematic characters of nymphs 225 



List and characters of the species 227 



Part III.— A Summary of the Philadelphia Odonate Fauna. 



Scope of this catalogue 266 



Seasonal distribution (imagos) 267 



Geographical distribution 268 



Synonymic changes introduced in Part II 269 



Index 269 



Explanation of plates 272 



For correction of an error in the test, see page 226, foot-note * 



