CONTENTS 



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

 WITH DESCRIPTIONS OF THE IMMATURE STAGES. PART 



L PETALURIDyE, ^SCHNID^, AND GOMPHID.E. BY JAMES page 



G. NEEDH \i\l AND CHARLES A. HART 1-94 



Introduction i 



Order Odonata 3 



Characteristics, Phylogcny, and Fainilies 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 n 



Waters from which Collections were made 12 



Ayjnphs inhabiting Various KiJtds of Situations- 12 



Living among submerged vegetation 13 



Living at the bottom 13 



Living concealed in mud or sand bottom 14 



Aymphs inhabiting the Various Jlliiiois I loiters . . 15 



Larger rivers 15 



Smaller streams 16 



Lakes 16 



Food Relations 17 



Food of nymphs 17 



Nymphs as food 17 



Adults 18 



Collecting and Rearing 18 



Collecting 18 



Preserving 20 



Rearing 20 



Characters used in Classification 21 



The nymph 21 



The imago 23 



Key to Families 25 



