TABLE OF CONTENTS xi 



The epipharynx 46 



The hypopharynx 47 



d . The segments of the head 47 



3. THE THORAX 



a. The segments of the thorax 48 



The prothorax, mesothorax, and metathorax 48 



The alitrunk 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 5 1 



The sclerites of the pleura 51 



The episternum 5 1 



The epimerum 5 1 



The preepisternum 5 1 



The paraptera 5 1 



The spiracles 5 2 



The peritremes 5 2 



The acetabula 5 2 



The sclerites of a sternum 5 2 



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 styli 56 



The trochanter 57 



The femur 57 



The tibia 57 



The tarsus 57 



The wings 58 



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 ^ 



The axillary excision 61 



