CONTENTS 



PAGE 



Introduction ^^^~i 63 



Acknowledgments ^ 



Habits and habitats of species ^^^ 



Methods of collection and preservation lo* 



Economic importance of the order 1^^ 



Arrangement of families ^ 



Scope of work 170 177 



Characters of the larvae 17^ 



Suborder Orthorrhapha ^^^ 



Division Nematocera ^' 



Division Brachycera 



Suborder Cyclorrhapha ' 



Division Acroptera 



Division Aschiza ^ „g 



Division Schizophora ^^_^_q 



Characters of the pupae ^^'^ 



Suborder Orthorrhapha ^^^ 



Division Nematocera ^_g 



Division Brachycera _g 



Suborder Cyclorrhapha ^ „g 



Divisions Acroptera, Aschiza, and Schizophora 



Keys to suborders: — ^jq 



Larvae 



Larvae 



179 



Pupae ^gO 



Imagines ••••••••• '. ; I .180-407 



Suborder Orthorrhapha 



Keys to divisions: — ^g^ 



180 



Pupae -^^j^ 



I"^agines 182-307 



Division Nematocera ^g2 



Tabular arrangement of families 



Keys to families : — ^g^ 



Larvae , gr 



Pupae jgg 



If ^g;^^ ;;■;:;:;;::;; 190-245 



Tribe Polyneura iqo-24'i 



Superfamily Tipuloidea 191-207 



Family Tipulidae tj" „ 



Keys to subfamilies 



Ctenophorinae __ 



Tipulinae „„,, 



Principal papers on North American Tipulidae ^"o 



