CHAP. II. THE EGG STATE. 



17 



ovipositor, composed of three hair-like pieces, is bent and 

 carried under the body, and directed to the spot where, be- 

 neath the bark of a tree, a grub or larva is supposed to lie. 

 The same female is shown (Fig. 40), when at rest. 



The greater number of the Gall-flies and Saw-flies make an 

 incision in the leaves or twigs of trees, etc., in which they de- 

 posit their eggs. 



Fig. 37. Fig. 38. Fig. 40. 



Various kinds of Beetles deposit their 

 eggs in the ground ; .the Hessian-flies, on 

 the stalks of wheat, the Joint-worm flies, 

 in the stalks of wheat, barley, etc. ; the 

 Army-worm Moth, on the lower parts of 

 grasses ; the Butterflies, on the leaves of 

 plants, etc., on which their larvae are to feed ; the Codlin-moth, 

 on fruits; and the Borers on the bark of trees and plants. 



The egg of an insect consists essentially of three parts, 

 namely: the central germ cell, surrounded by the yolk within 

 the outer shell. 



