6 TABLE OF CONTENTS. 



Aquatics — Concluded. 



Nepidse — PAGE 



Taxonomy of Family 151 



Biology of Family 157 



Notonectidse — 



Taxonomy of Family 164 



Biology of Family 177 



Naucoridse — 



Taxonomy of Family 198 



Biology of Family 207 



Corixidse — 



Taxonomy of Family 210 



Biology of Family 215 



(Food of Corixids) 234 



General Review 250 



Bibliography 251 



Plates 266 



The Male Genitalia as Characters of Specific Value in Certain 

 Cryptocerata (Hemiptera-Heteroptera) 329 



