BIOLOGICAL NOTES ON BLOODSUCKING FLIES 227 



Plate XV. — Pupae of Simidium. Fig. 1. — Respiratory filaments of pupa of SimuUum 

 vittatnm. Fig. 2. — Pupa of Simnlium vemtstum, in pupal case. Fig. 3. — Pupa of 

 SimuUum hracteatum : A, side view of filaments. Fig. 4. — Pupa of SimuUum jen- 

 ningsi. Fig. 5. — Pupa of SimuUum pictipes, in pupal case. All greatly enlarged. 

 (After Jobbins-Pomeroy.) From U. S. Dept. Agr. Bull. 329, Plate V. 



