Plate IV. 



RESPIRATORY FILAMENTS OF PUP^ OF SIMULIID.Ti:. 



Fis- 1. — ProsiDiuIiuiii pccunrum. 

 2. — Sim uU u III pictipes. 

 C. — SimuUuin vcnustuiii. 

 4. — ShiuiUiiiit rittntiim. 

 5. — Pros i in 1(1 ill III It irt ipes. 

 6. — Simuliuiii incridionale. (Original.) 



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