Bui. 329, U. S. Dept. of Agriculture. 



Plate II. 



ad 1 



Male Genitalia of Simulium. 



Fig. 1.— Genitalia of male Simulium pictipes: c, c, Claspers; a, a, a, anal plates; am, am, 

 arms; b'b, basal pieces; st, st, styli; ad, adminiculum. Fig. 2.— Genitalia of male 

 Simulium venustum. Fig. 3.— Genitalia of male Simulium jenningsi. Fig. 4.— Geni- 

 talia of male Simulium bracteatum. w "± s _a«vit , i , ■ , ,.. ^,, 



All greatly enlarged. (Original.) 



Fig, 5.— Genitalia of male Simulium vittatum. 



