CONTENTS 



Page 



Introduction I 



I. The larva 3 



The head 4 



The feeding organs 1 1 



The labrum 12 



The preoral cavity 15 



The epipharyngeal apparatus 15 



The mandibles 16 



The maxillae 17 



The labium and hypopharynx 19 



The pharynx 21 



Larval feeding 22 



The thorax 24 



The abdomen 26 



Internal anatomy 31 



The tracheal system 31 



The dorsal blood vessel 32 



The alimentary canal 32 



The Malpighian tubules 33 



The salivary glands 33 



The nervous system 34 



The reproductive organs 34 



Food reserves 34 



II. The pupa 34 



The pupal development 35 



The mature pupa 39 



General external structure 39 



The head and mouth parts 43 



The thorax 44 



The abdomen 45 



The pupal metamorphosis 46 



III. The adult 48 



The head 51 



The organs of feeding 55 



The proboscis 55 



The cibarial pump 60 



The pharyngeal pump 63 



The thorax 64 



The abdomen 67 



Internal anatomy 72 



The circulatory organs 73 



The alimentary canal 73 



The salivary glands 76 



The reproductive system 76 



References 80 



iii 



