Bui. 3?9, U. S: Dept. of Agriculture. 



Plate V. 



PUP/E OF SlMULIUM. 



Fig. 1. — Respiratory filaments of pupa of Simulium vittatum. Fig. 2. — Pupa of 

 Simulium venustum, in pupal case. Fig. 3. — Pupa of Simulium bracteatum: A, 

 side view of filaments. Fig. 4. — Pupa of Simulium jenningsi. Fig. 5. — Pupa of 

 Simulium ■pictipes, in pupal case. All greatly enlarged. (Original.) 



