224 PRODUCTIVE FARMING 



The adult emerges from the pupa case with the new set 

 of organs just mentioned. It does not look like the larva 

 that formed the pupa case about itself, and yet it is the same 

 individual. When a butterfly comes from its pupa it crawls 

 upon some object, as a plant stem, where its folded wings may 



FIG. 123. The currant worm: a, adults; b, larvae in various stages of devel- 

 opment; c, pupa; e, eggs along veins on leaf. (From Smith's "Insect Friends and 

 Enemies.") 



hang downward. The wings gradually unfold or "grow" 

 and in about twenty or thirty minutes they may be of full 

 size and firm enough to use in carrying the insect in the air. 

 The adult never moults and never grows any larger. 



Special names are given to some forms of larvae. The 

 larvae of butterflies and moths are called caterpillars. The 

 larva of a beetle is called a grub. A maggot is the larval 

 form of the fly. Mosquito wrigglers are really the larvae. 



