REPORT ON FORESTS. 



207 



rollers, folding or rolling the entire or part of a leaf into a 

 cylinder, in which they feed under shelter. Yet others live in 

 colonies and spin up a number of leaves or even an entire branch. 

 The well known web-worms and tent caterpillars will readily 

 occur to all, and wide-spread injury is sometimes done by one or 

 both. The forest tent caterpillar has defoliated acres of forest 

 land in New York State during the season of 1899, and has 

 opened the way for yet more serious injury in 1900. Less known 

 is another species that attacks young trees, often enveloping one 

 of 4 or 5 feet completely. When this occurs the death of the 

 young tree often follows, the growth being smothered where 

 not actually eaten. 



Figure 2. Elm leaf beetle ; typical of a destructive feeder on foliage : a, a, egg patches on leavts ; b t 



larvae feeding ; c, adult ; all natural size : e, egg-mass ; f t surface of the egg ; g, larva ; 



h, i, details of the same ; j, pupa ; k, beetle ; /, surface of elytra ; 



all enlarged : from Div. Ent. U. S. Dept. Agl. 



Numerous "grubs," or beetle larvae, live on the leaves of 

 forest trees, often in very large numbers, and these also may be 

 open feeders, leaf miners or sac bearers ; but they rarely become 



