INSECTS 



15 



strip the trees of their leaves. The female moth is wingless (Mg. 11). 

 When she emerges from her cocoon, she lays a mass of eggs upon the 



FIG. 11. Life history of tussock moth. (Osborn.) 



outer surface of the cocoon and secreces about them a white foamy 

 mass which hardens (Fig. 11). If this occurs in the autumn, the eggs 



