2o6' 



INSECT LIFE. 



of the young student represent two groups — the leat- 

 rollers and the leaf-miners. 



THE LEAF-ROLLERS. 



If the pupil will examine the leaves of almost any 

 forest tree during thesummer or autumn 

 he will find that some of them are rolled 

 in such a way as to form a nest, within 

 which one or more larvas live or have 

 lived. These nests vary greatly in form ; 

 sometimes a single leaf, or even only a 

 part of a leaf, is rolled ; in other cases 

 the nest is formed by fastening together 

 several leaves. In most cases the build- 

 ing of the nest is the work of a single 

 larva, but in very many instances several 

 larvse work together to build a common 

 nest. It should be said, however, that 

 each of the leaf-rolling species builds a 

 nest of a particular form, and each of 

 these species infests a certain kind or 

 kinds of trees. Hence, when a student 

 has carefully studied the life history of a 

 leaf-roller, he will be able, as a rule, to 

 recognize the work of this species by a 

 study of the nest alone. 



In making its nest the leaf-roller fast- 

 ens the folds of its nest in the desired 

 position by means of little bands of silk. 

 Fig. 175. " Several of these bands are shown in Fig. 

 175, and in Fig. 176 are represented sev- 

 eral types of nests made of rolled leaves. 



The breeding of leaf-rollers is somewhat more 



