736 
Wisconsin Academy of Sciences, Arts and Letters. 
PLATE LX. 
Triwnodes flavescens. 
Fig. 1. Male genitalia, lateral. Inferior appendages extended, X 27o 
Fig. 2. Maxillae, larva, X 47. 
Fig. 3. Labrum, larva, X 60. 
Fig. 4. Anal appendages, pupa, dorsal view, X 20. 
Fig. 5. Mandible, pupa, X 60. 
Fig. 6. Border of first abdominal tergum, pupa, X 20. 
Hydropsyche alternans. 
Fig. 7. Wings of male. 
Fig. 8. Male genitalia, lateral, X 34. 
Fig. 9. Male genitalia, dorsal, X 34. 
Fig. 10. Penis, dorsal view, X 47. 
Fig. 11. Clypeus, larva, X 20. 
Fig. 12. Labrum, larva, X 47. 
Fig. 13. Dragging hook, larva, lateral view, x 20. 
Fig. 14, a, b. 1st and 3rd legs, larva, X 20. 
Fig. 15. Maxillae, larva, X 47. 
Fig. 16. Mandible, pupa, X 27. 
Fig. 17. Labrum, pupa, X 47. 
Fig. 18. Anal appendage, pupa, dorsal view, X 34. 
Fig. 19. Dorsal plates of pupa numbered according to the segments on 
which they are found, x 47. 
