Examples of Pupils' Work 171 



Within this lies the small white egg never more than 

 one-eighth of an inch long which the insect has laid in 

 the leaf (Fig. 5). Frequently two eggs may be found in 

 one gall, but from observation I can say that each egg has 

 its separate capsule. 



Beginning this study with the egg, I had no way of deter- 

 mining the length of time between the deposit of the egg 



FIG. 3. Gall. FIG. 4. Capsule. FIG. 5. Egg. 



and its metamorphosis into the larva stage. As a usual 

 thing the larva, which is about one-fourth of an inch in 

 length and a grayish-white in color, eats its way out of the 

 gall and spends some time in feeding upon the leaves of 

 the sage-brush (Fig. 6). Upon examining the bushes dur- 



FIG. 6. Larva greatly magnified; this line ( ) shows natural size. 



ing the months of May and June, any number of these larvae 

 may be seen crawling over the leaves or suspended from 

 them by silk threads. 



