6 TABLE OF CONTENTS. 



Aquatics — Concluded. 



Nepidx — PAGE 



Taxonomy of Family 151 



Biology of Family 157 



Noionectidae — 



Taxonomy of Family 164 



Biology of Family 177 



Naucoridse — 



Taxonomy of Family 198 



Biology of Family 207 



Corixidae — 



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 



