REPORT ON FORESTS. 



207 



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

 cj'linder, in which they feed nnder shelter. Yet others live in 

 colonies and spin np a nnmber of leaves or even an entire branch. 

 The well known web-wonns and tent caterpillars will readily 

 occnr to all, and wide-spread injur)' is sometimes done by one or 

 both. The forest tent caterpillar has defoliated acres of forest 

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

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

 is another species that attacks yonng trees, often enveloping one 

 of 4 or 5 feet completely. When this occi;rs the death of the 

 young tree often follows, the growth being smothered where 

 not actual Iv eaten. 



Figure 3. — Elm leaf beetle ; typical of a destructive feeder od foliage ; a, a, egg patches on leaves ; b, 



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



h, i, details of the same ; j, pupa ; ]c, beetle ; I, 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 nia\- Ije 

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



