TABLE OF CONTEXTS. 



PAGE 



ackxowledgmen'ts 3 



Foreword 7 



Introduction 8 



Survey of Families Including a Synoptic Key to Aquatic ant) 



Semiaquatic Hemiptera, (Key p. 11 ) 9 



Historical Sketch of the Biology of Aquatic ant) Semiaquatic 



Hemiptera 13 



EcoLOGic and Economic Rel.\tions, Including a Habitat Key to 



THE Aquatic and Semiaquatic Heteroptera. Key p. 29i 17 



Form ant) Function 38 



Semi.aquatics: 



Gelastocoridae — 



Taxonomy of Family. . 45 



Biology of Family . 49 



Ochteridse — 



Taxonomy of Family 51 



Biologj- of Family 53 



Sal did se — 



Taxonomy of Family 54 



Biologj^ of Family . 79 



Hebridse — 



Taxonomy of Family 82 



Biologj- of Family 88 



Hydrometridse — 



Taxonomy of Family 91 



Biolog\' of Family 92 



Mesoveliidse — 



Taxonomy of Family 99 



Biologj' of Family . 101 



Gerridse — 



Taxonomy of Family 106 



BiologA,^ of Family 116 



Veliidse — 



Taxonomy of Family 121 



Biology of Family . . 134 



Aquatics: 



Belostomatidx — 



Taxonomy of Family 141 



Biology of Family 142 



(5) 



