CONTENTS 



PAGE 



Introduction 161-173 



Acknowledgments 163 



Habits and habitats of species 163 



Methods of collection and preservation 164 



Economic importance of the order 165 



Arrangement of families 168 



Scope of work 173 



Characters of the larvae 173-177 



Suborder Orthorrhapha 173 



Division Nernatocera 173 



Division Brachycera 174 



Suborder Cyclorrhapha 175 



Division Acroptera 175 



Division Aschiza 175 



Division Schizophora 176 



Characters of the pupae 177-179 



Suborder Orthorrhapha 177 



Division Nernatocera 177 



Division Brachycera 17S 



Suborder Cyclorrhapha 178 



Divisions Acroptera, Aschiza, and Schizophora 178 



Keys to suborders: — 



Larvae 179 



Pupae 179 



Imagines 180 



Suborder Orthorrhapha 180-407 



Keys to divisions: — 



Larvae 180 



Pupae 180 



Imagines 181 



Division Nernatocera 182-307 



Tabular arrangement of families 182 



Keys to families : — 



Larvae 183 



Pupae 185 



Imagines 188 



Tribe Polyneura 190-245 



Superfamily Tipuloidea 190-245 



Family Tipulidae 191-207 



Keys to subfamilies 193 



Ctenophorinae 194 



Tipulinae 195 



Principal papers on North American Tipulidae 206 



