TABLE OF CONTENTS 

 CHAPTER I 



PAGE 



The Genesis of the Uniform Terminology of the Wings by Insects i 



CHAPTER n 

 The Tracheation of the Wings of Insects 



Method of study of the tracheation of wings 12 



The development of wing- veins 12 



The hypothetical primitive type of insect wings 15 



The tracheation of the wings of larvas and pupas 19 



Variations in the extent of the tracheation of the wings of nymphs and 



of pupse 20 



Illustrations of the simpler type of the tracheation of the wings 21 



Illustrations of increased tracheation of wings 21 



Illustrations of reduced tracheation of wings 22 



Eccentric tracheation of wings 23 



The basal connections of the tracheae of the wings 25 



The Basal Connections of the Trachea of the Wings of Insects. By 



Royal Norton Chapman 27 



CHAPTER III 

 The More General Features of the Wings of Insects 



The presence or absence of wings in insects 52 



The fundamental structure of the wings of insects 53 



The different types of insect wings 53 



The fan-like wings 53 



The elytra 54 



The hemelytra 54 



The tegmina 54 



The halteres 54 



The pseudo-halteres 54 



The margins of wings ' 54 



The angles of wings 54 



The tegula 54 



The axillar}^ cord 54 



The axillary membrane 55 



The alula 55 



The articulation of the wings 55 



The thoracic supports of the wings 55 



The axillary sclerites 56 



The costal sclerite 57 



The tuberosities of the base of the wing 57 



The cubito-anal sulcus 57 



The corrugations of the wings 57 



The cubito-anal fold 57 



(xi) 



