CLASSIFICATION AND DESCRIPTION OF COMMON INSECTS 267 



Eggs. — Elliptical, yellowish, pedicellate, ^^q inch long; laid singly 

 just under the skin of the apple; hatch in 4-10 days. 



Larva. — ^A small plump white legless maggot, l^ inch long; mouth- 

 parts with a pair of small black rasping hooks; caudal end truncate; 



Fig. 169. — A female of the apple maggot fly {Rhagoletis pomonella). M uch enlarged. 



{After W. H. Briltain.) 



makes soft discolored trails and corky strands in the pulp; full grown 

 in 4-6 weeks, or when the infested fruit is ripe. • Infested apple usually 

 falls, and larvae leave the fruit i to 4 weeks later to enter the ground 

 (Fig. 170). 



Fig. 170. — A parasite of the apple maggot (Biosteres rhagoletis). Enlarged. 



W. H. Briltain.) 



{After 



Pupa. — -Puparium just beneath the surface of the ground in which 

 the pupa rests all winter, and in some cases the following year. Some 

 flies emerge in September from early pupae. 



