CONTENTS 



ARTICLE I. THE DRAGON-FLIES (ODONATA) OF ILLINOIS, 

 WITH DESCRIPTIONS OF THE IMMATURE STAGES. PART 



I. PETALURID.E, ^SCHNID^, AND GOMPHID^. BY JAMES page 



G. NEEDH AM AND CHARLES A. HART 1-94 



Introduction 1 



Order Odonata 3 



Characteristics, Phytogeny, and Families 3 



Literature 5 



Life History '. 7 



Life cycles 7 



Nymphal and adult periods. 8 



Change of nymphal color at molting time 8 



Transformation 9 



Oviposition 9 



Relative abundance of nymph and imago 10 



Adult habits 11 



History of Odonata observed at Havana 11 



Waters from which Collections were made 12 



Nymphs inhabiting Various Kinds of Situations- 12 



Living among submerged vegetation 13 



Living at the bottom 13 



Living concealed in mud or sand bottom 14 



Nymphs inhabiting the Various Illinois Waters 15 



Larger rivers 15 



Smaller streams 16 



Lakes 16 



Food Relations 17 



Food of nymphs , 17 



Nymphs as food 17 



Adults 18 



Collecting a?id Rearing 18 



Collecting 18 



Preserving 20 



Rearing 20 



Characters used in Classification 21 



The nymph 21 



The imago 23 



Key to Families 25 



