154 



FARM FRIENDS AND FARM FOES 



Is it like the texture of a moth cocoon ? Are they water-tight ? Can 

 you find any cocoons out of doors beneath infested currant bushes ? 



7. Cut open a cocoon in which the insect has pupated and find the 

 pupa and the cast skin. Compare this pupa, especially in regard to the 

 distinctness of the legs and other appendages with the pupa of a moth 

 or butterfly. 



8. Observe how the fly escapes from the cocoon. Does it gnaw off 

 a cap ? Compare it with a bee or a wasp and then with a two-winged 

 fly. Study -its structural characters. 



9. Give either orally or in writing a short account of the life of the 

 Currant Worm. This outline may help : 



The laying of the eggs. 

 The hatching of the' eggs. 

 The growth of the caterpillar. 

 The spinning of the cocoon. 

 The change to the pupa. 

 The change to the adult fly. 



10. Make these drawings : A leaf with round holes made by young 

 larvae ; leaf badly eaten ; a larva, side view ; a cocoon ; an adult sawfly. 



OTHER INSECTS 

 Read such of the following references as your teacher may direct : 



The Joint Worm, Circular 66, U. S. Bureau of Entomology. Insect Enemies 

 of Growing Wheat, Farmers' Bulletin, 132. 



