TABLE OF CONTENTS xi 



The epipharynx 46 



The hypopharynx 47 



d. The segments of the head 47 



3. THE THORAX 



c. The segments of the thorax 48 



The prothorax, mesothorax, and metathorax 48 



The ahtrunk 49 



The propodeum or the median segment 49 



b. The sclerites of a thoracic segment 49 



The sclerites of a tergum 49 



The notum 49 



The postnotum or the postscutellum 50 



The divisions of the notum 50 



The patagia 50 



The parapsides 51 



The sclerites of the pleura 51 



The epistemum 51 



The epimerum 51 



The preepistemum 51 



The paraptera 51 



The spiracles 52 



The peritremes 52 



The acetabula 52 



The sclerites of a sternum 52 



c. The articular sclerites of the appendages 53 



The articular sclerites of the legs 53 



The trochantin 53 



The antecoxal piece 54 



The second antecoxal piece 54 



The articular sclerites of the wings 54 



The tegula 54 



The axillaries 54 



d. The appendages of the thorax 55 



The legs 56 



The coxa 56 



The styU 56 



The trochanter 57 



The femur 57 



The tibia ' 57 



The tarsus 57 



The wings 5^ 



The different types of wings 59 



The margins of wings 60 



The angles of wings 60 



The axillary cord 60 



The axillary membrane 60 



The alula 60 



The axillary excision 61 



