CONTENTS 



Diagnosis of Mosquitoes 4 



Key to Culicidae and Chaoboridae 4 



Adults ( Both Sexes ) 4 



Larvae 5 



List of Included Species 5 



Key to Sexes of Culicidae Adults 5 



Keys to Culicidae Females 5 



Key to Genera of Culicidae { Females ) 6 



Key to Species of Aedes ( Females ) 8 



Key to Species of Anopheles (Females) 12 



Key to Species of Culex (Females) 13 



Key to Species of Culiseta ( Females ) 14 



Key to Species of Orthopodomyia (Females) .... 14 



Key to Species of Psorophora (Females) 14 



Keys to Culicidae Males 14 



Key to Genera of Culicidae (Males) 15 



Key to Species of Aedes (Males) 16 



Key to Species of Anopheles ( Males ) 22 



Key to Species of Culex ( Males) 22 



Key to Species of Culiseta ( Males ) 24 



Key to Species of Orthopodomyia (Males) 24 



Key to Species of Psorophora ( Males ) 24 



Keys to Culicidae Larvae 25 



Key to Genera of Culicidae (Larvae) 26 



Key to Species of Aedes (Larvae) 29 



Key to Species of Anopheles (Lar\'ae) 37 



Key to Species of Culex ( Larvae ) 39 



Key to Species of Culiseta ( Larvae ) 40 



Key to Species of Orthopodomyia (Larvae) 43 



Key to Species of Psorophora (Larvae) 43 



Keys to Culicidae Eggs 44 



Key to Genera of Culicidae ( Eggs ) 44 



Key to Species of Aedes ( Eggs ) 45 



Key to Species of Psorophora ( Eggs ) 47 



Mosquitoes and Disease 48 



Acknowledgments 49 



Selected References 49 



Literati;re Cited in the Illustrations 49 



Index 50 



Cover Drawing. — One of the lar.uest Illinois mosquitoes is 

 the ' gallinipper," Psorophora ciliata. which may attain a wine- 

 spread of 15 mm (over half an inch). It is a vicious biter and 

 is widely distributed over Illinois. The larvae or wrigglers of this 

 species breed in rain pools and have the habit of feeding on larvae 

 of other mosquito species. 



