EXPLANATION OF PLATE III. 



The Apple Maggot. 

 ITrypeta pomonella^ Walsh.) 



Figures la, lb, Ic and 2 are copied from Mrs. A. B. Comstock's 

 admirable drawings in United States Agricultural Report, 1881-2, 

 Plate XIV. 



Figures 3 and 4 were photographed by Mr. L. H. Merrill from 

 slides prepared by the writer. 



Figures 5 and 6 are original. 



Figujre la. Side view of anterior end of the larva, showing jaw 

 system, portion of trachea and cephalic spiracle. 



Figure lb. Anterior end of larva viewed from above, showing 

 jaw system and spiracles. 



Figure Ic. Enlarged view of caudal spiracle showing the three 

 transverse slit-like openings and the four groups of bristles. 



Figure 2. Dorsal view of the pupa, magnified about ten times. 



Figure 3. Portion of apple peel showing the puncture made by 

 the ovipositor of the female, magnified about thirty times. 



Figure 4. Portion of apple peel showing an exit-opening of the 

 larva, magnified about five times. 



Figure 5. Cross section of High Topped Sweeting showing 

 advance work of full grown larvae, natural size. 



Figure 6. Cross section of a Winthrop Greening showing the 

 yjiovk of half grown larvae, natural size. 



