PHASES IN THE LIFE HISTORY OF NON-BITING FLIES 133 



Plate I. — Screw worms and blow flies. Fig. 1 (upper left). — The blue bottle fly, Cal- 

 liphora iHjmitoria. Fig. 2 (upper right). — The green bottle fly, Lucilia caesar. Fig. 

 3 (lower left). — The American screw worm, Chrysomt/a maceUaria. Fig. 4 (lower 

 right). — The black blow fly, Phonnia regina. (Howard and Pierce, photos by 

 Dovener.) 



