FIG. 303. Tfie imported onion-maggot (Pegomyia ceparum Bouche): a, 

 adult; b, maggot; c, puparium; d, anal segment of maggot showing 

 spiracles; e, head with mouth-parts all very much enlarged; / and g 

 show injury to young onions. (After J. B. Smith.) 



421 



