TABLE OF CONTENTS 



PACE 



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 



iSIovable Parts of the Head 32 



Antennae : 33 



Mandibles 34 



Maxillae 36 



Labium 4' 



Epipharynx and Hypopharynx 49 



Summary 54 



Bibliography 57 



Explanation of Plates 6i 



