DESCRIPTION. 



Egg. — The eggs of the apple maggot are quite small, varying from 

 0.8 to 0,9 mm. in length by 0.2 to 0.25 mm. in width, fusiform, and 

 light yellow in color as taken from the fruit. A short, broad pedicel, 

 about one-twentieth the length of the ^g'g., is found at the broader 

 end, which end is darker and pitted with irregular hexagonal cells 

 with raised lacerated borders for about one-fourth the length of the 

 ^g'g. (See fig. 2, a.) 



Larva. — The larva (fig. 1, 6) is footless, and when full grown is 

 from 7 to 8 mm. long, with a width of from 1.75 to 2 mm., yellowish- 



FiG. 2. — lihagolctis ponioiHihi : a. Egg; h, head of larva, showing chitinous hooks and 

 framework within the head, and funnel-shaped spiracle ; c, caudal spiracle ; d, oviposi- 

 tor, with which eggs are placed beneath skin of apple. All greatly enlarged. (6, c. 

 After Comstock ; a, d, after Harvey.) 



white in color, at times tinged with greenish. The body is composed 

 of 14 segments, widest across the ninth, tenth, and eleventh, and 

 sloping gradually backward, and more rapidly toward the head end. 

 The caudal end is truncate, and on the lower portion of the anterior 

 end (first segment) is a pair of black, curved, parallel hooks, attached 

 to a chitinous framework within the head, the hooks being used to 

 rasp the pulp in the liberation of juice for food, A pair of spiracles 

 occurs on the dorsal surface on each side at the juncture of the first 



[Cir. 101] 



