TABLE OF CONTENTS 



PAGE 



Introduction 7 



Methods _ 8 



Acknowledgments 9 



Materials 9 



Fixed Parts of the Head 13 



Epicranial Suture 14 



Fronto-clypeus 17 



Tormae ..._ 19 



Ptilinum 20 



Labrum 20 



Vertex 21 



Compound Eyes and Ocelli 22 



Occiput and Postgenae : 23 



Tentorium 26 



Movable Parts of the Head 32 



Antennae _ ; 33 



Mandibles 34 



Maxillae _ 36 



Labium „ _ 41 



Epipharynx and Hypopharynx 49 



Summary _ 54 



Bibliography _ 57 



Explanation of Plates 61 



