ABDOMEN 27 



female they form the tubular ovipositor which, in repose, is tele- 

 scoped within the abdomen. The second, third, fourth and fifth 

 abdominal segments are well developed and each mainly consists of 

 a large tergal plate, which extends laterally to the \entral side. 

 The sternal plates are nuich reduced, and foim a series of narrow 

 plates lying on the ventral membrane along the mid-ventral line. 

 The spiracles are situated on the latiTal margins of the tergal 

 plates. The sclerites of the abdonu'ii which are exposed are 

 strongly setose, especially the fourth and fifth dorsal plates, but 

 they do not bear macrochaetae. 



The terminal abdominal segments of the male and female are 

 described in detail in the account of their reproduction systems 

 (see pp. 50, 53). 



