MALE GENITALIA 



69 



sometimes it is very elongate. The surface of the tergites and stemites bears 

 many scattered hairs and these vary in coarseness and abundance with the 

 species ; there is a series of coarser and longer hairs along their posterior margins. 

 These marginal hairs, and still more so the others, are much less conspicuous in 

 the Sabethini ; in this tribe, however, the eighth segment bears numerous stiff 

 bristles posteriorly, particularly beneath. 



THE ABDOMEN OF THE MALE. 



The abdomen of the male is often much longer than that of the female. The 

 ninth and tenth segments are crowded together and carry the genital armature. 

 Often the abdomen is depressed and of nearly uniform width throughout. The 

 tergite of the first segment, as in the female, bears many long hairs. The abdo- 



FiG. 4. — Diagram of the male genitalia of Aedea: A, Side 

 piece ; B, Clasp filament ; C, Lobes of side piece ; D, Harpe ; 

 Ej Harbago ; F, Unci. 



men is often strongly ciliate along the sides, numerous long hairs being inserted 

 laterally on the tergites. This is true of Anopheles, Megarhinus and most 

 species of Culex and Aedes as well as of many others. In other forms there is no 

 obvious lateral ciliation but there is a tendency to increased coarseness of all 

 the setae towards the tip of the abdomen. Sometimes the eighth segment is 

 armed with many coarse setae. Usually the setae of the stemites are coarser in 

 the male than in the female. In the Culicini there is a reduction in the size of 

 the segments near the tip of the abdomen. In many Sabethini the abdomen is 

 distinctly expanded towards the tip, and the stemite of the eighth segment par- 

 ticularly, bears many coarse bristles. The male genitalia are very important 

 in classification and for systematic purposes may be described as follows : 



The Male Genitalia (fig. 4). — The male genitalia consist of two thick 

 conical appendages, the side-pieces (a). These each bear a smaller terminal 



