PLATE lY. 



Fig. 1. Eggs of Pegojnyia vicina on}eai of Chenoj>odium alhum. 

 Magnified about 16 times. The irregular dots on the surface of the 

 leaf is a pecuh'ar wax-like secretion which gives the Chenopodium 

 leaf its mealy appearance. ' 



Fig. 2, The maggot or larva. Magnified approximately three times, 

 showing the hook-like jaws and the irregular dark area of the 

 intestinal contents. 



Fig. 3. Puparium magnified approximately three times. 



Fig. 4. Leaf of spinach showing mined area at {a) slightly 

 magnified. 



Fig. 5. Male. 5' female magnified about 4 times. 



Fig. 6 and 6'. Top and side view of the bug {Coriscus ferus) 

 which feeds on the maggots, magnified about 4 times. 



All figures jphotographed fy'OTii natural objects hy F. A. Sirrine. 



