CONTENTS 



PAGE 



TntroMuotion 217-289 



Methods of collectin^r 277 



Methods of rearing 278 



Methods of preservation 278 



Synonymy affecting family names 279 



Biology and taxonomy , 281 



The egg stage 281 



Larval characters 282 



Food of the larvas 286 



Characters of the pupa" 286 



Characters of the imagines 287 



Food of the imagines 288 



Acknowledgments 288 



Keys to subfamilies 289 



Larva; 289 



Pupa; 289 



Imagines 290 



Ceratopogoninir 290-361 



Larval characters 290 



Pupal characters 291 



Tmaginal characters 292 



Keys to genera 293 



Larva; 293 



PupjE 293 



Imagines 293 



Keys to larva; and pupa- of North American species of Ccra1op(><ion and 



Forcipomyia 294 



Addendum to CeratopognniniV 360 



Supplementary key to species of Hetcrnmiiia 360 



Tani/pinw 361-398 



Larval characters 362 



Pupal characters 363 



Tmaginal characters 363 



Key to genera (imagines) 364 



Key to larvae 364 



Key to pupa; 365 



Unidentified larvic 397 



Chironominw 398-534 



Key to genera 400 



Key to larva; 401 



Key to pupa; 406 



Unidentified larvte and pujia' 528-534 



Distribution of Vliironomidd' in the Illinois L'iver 534 



Summary of Illinois genera and species in comparison with those recoriled 



for other states 536 



Number of Illinois species recorded 536 



Number of New Jersey species recorded 537 



Number of species recorded by Johannsen 537 



index to genera and species 539 



