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 2$ 



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 



