TABLE OF CONTENTS. 



Page. 



Introduction 1 



Acknowledgments 1 



Common names for Strepsiptera 2 



History 2 



Systematic position 4 



Collection 11 



Biology 13 



Relations to host 15 



1. Actual relationship to the host 15 



2. Effects of parasitism on the host 27 



1. Extermination of race or species 27 



2. Loss of vitality by host . : 28 



3. Acceleration or retardation of development 30 



4. Alteration of general features 30 



5. Alteration of external sexual characters 32 



6. Synonymy due to stylopization 35 



7. Injury to internal organs 37 



8. Effects upon normal functions 37 



9. Effects subsequent to exit of male 3S 



3. Effects of various host conditions upon the parasites 38 



4. Biology of the host as influencing the biology of the parasite 39 



1. Biology of the host 39 



2. Social economy of hosts 39 



Biology of the parasite 45 



Fertilization 45 



Oogenesis 46 



Larvi parous reproduction 47 



Metamorphosis 47 



Alimentation 48 



Biological notes 49 



Internal structure 57 



Alimentary system 57 



Nervous system 59 



Tracheal system 62 



Reproductive system 62 



External structure 63 



Male 63 



Female 67 



Classification 68 



Males 70 



Table of superfamilies and families based on males 70 



Table of genera 70 



Artificial key to genera based on wing venation 73 



Females 74 



Table of superfamilies, families, and genera based on females 74 



Table for separation of genera of the Triungulinids 75 



Correlation of host and parasite classifications 77 



Check list of the Strepsiptera of the world 78 



VII 



