PLATE XVIII 



Figure 1. The ovipositor of MHSCCI nebula, extended, x 22. 



Figure 2. The distal end of the abdomen of Hippobosca maculata, 

 $ . g.o., the genital opening, an., the anal plates, one 

 on each side of the anal opening. X 40. 



Figure 3. The genital armature of Glossiiia, 3 , the hypopy- 

 gium being extended backwards to display it. i.e., 

 inferior clasper. ed., editum. s.c., superior clasper. 

 c.m., connecting membrane, h., harpes. sc'., c.m'. ; 

 the dotted lines indicate the position to which the clas- 

 pers and the membrane can be displaced. After 

 Newstead. 



Figure 4. Diagram of the external genitalia of Plilebotomns, 



3 , after Annandale. u., upper or superior append-. 



age. ch., chaetae. f., genital filament, i., intermediate 



appendage, p., intromittent organ, s.b., subgenital 



lamella. 1., lower or inferior appendage. 



Figure 5. The genital armature of Tabanus albimediiis, 3 . 

 s.c., superior claspers. i.e., inferior claspers. t., tergite 

 of the last segment of the abdomen, p., penis, in its 

 sheath, x 80. 



Figure 6. One of the superior claspers of Culex concolor. X 100. 



Figure 7. The terminal segments of the abdomen of a Joblotia 

 sp., ? , forming a simple ovipositor. Note the loose 

 membrane between the plates, x 60. 



