CONTENTS. 



Pago. 



Preface 5 



Introductiou 9 



External structural characters: The head; the thorax; the ahdomen, ovi- 

 positor, etc 10 



Habits of the perfect insects IG 



Dimorphism and parthenogenesis 17 



The transformations or life history 18 



The egg and euibryological development; the larvae, their habits and 

 pupation. 



Distribution 21 



Classification 22 



Table of the subfamilies 26 



Subfamily I. — Bcthylina> 27 



II. — Emboleminii} 77 



III.— Dryiniuic 80 



IV. — Ceraphroniu.ne 102 



V. — Scelionina' 136 



VI. — Platygasterina?. 247 



VII.— -Helorinie 330 



VIII.— Proctotrypina; 331 



IX.— Belytina> 345 



X. — Diapriin;e 384 



Tabular view of the bred North American Proctotrypida? 449 



Literature and abbreviations 453 



Explanation to plates 459 



Index 465 



7 



