Abdomen 



T05 



sclerites ; in the flexible membrane between them is the 

 reproductive orifice, and close to it, the outlet of the 

 gluten-gland (fig. 75, ggo). The ninth or terminal seg- 

 ment is small, and bears a pair of valves ; the anus opens 

 on its dorsal surface. 



In the male fly (fig. 76) the eighth abdominal segment 

 shows no unusual features ; the ninth tergum is shield- 

 like and bears a small median spine, which projects a little 



Fig. 76. — Genital armature of male fly. i, ventral, j, dorsal. 

 3. lateral. 



beyond its posterior edge. The ninth sternum is deeply 

 bilobed. Three pairs of appendages are enclosed within 

 it, diminishing regularly inwards. The innermost pair 

 appears to be suj)ported by a small median plate. These 

 appendages are a little upturned ; the outer ones are 

 slightly curved, and form a forceps. 



These appendages of the male fly probably serve as 

 claspers. It has been remarked tliat they do not occur 



