PLATE XXXIX. 



P'IG. 5. Female S. vittatnui. (Greatly enlarged). 



Fig. 6. Male S. vittatiim. (Greatly enlarged). 



Fig. 7. Dorsal view of Simulium pupa removed from pupa case, t.lio.v- 

 ing pupal breathing gills and development of wing pads. 



Fig. 8. Simulium pupa immediately after transforming from the lar- 

 val state, showing the immature development of wing pads. 



Fig. 9. Lateral view of pupa, showing the membrane which hold.s it 

 in the pupa case. 



Fig. 10. .\d\\\i Shimlium larva. 



Fig. U. Adult Simulium larvae, showing the proleg at P and the caudal 

 aperture at .4. (See plate XVI, figure -34, A.) 

 Fig. 12. Similium egg highly magnified. 

 Fig. 13. Mass of Simil^^nn eggs magTiified. 

 Fig. 21. Mandibles and part of clypeus. 



Fig. 23. Labrum and hypopharynx united. .4 and B, points of attach- 

 ment; H, hypopharynx; L, labrum. 

 Fig. 25. Wing of S. vattatum. 



