40 



THE ELM-LEAF BEETLE. 



Galerucella luteola, Miill. 



This insect is confined in its attacks to elms, and prefers the 

 European to the American varieties. The winter is passed in the 

 adult condition and the adult is a beetle, about one-quarter of an inch 

 in length and less than half that in width, dull yellow in color with a 

 black stripe on each wing-cover. These adults begin to show them- 



Flg. 93. 



Thelelm-leaf beetle : a, a, egg patches on leaves ; b, laryss feeding ; c, adult ; all natural size ; the 



holes^eaten through the leaves are by the adults, the scraped surfaces are by the larvce ; 



6, egg mass ; /, surface of an egg ; g, larva ; h, i, larval details ; j, pupa ; 



k, beetle ; I, surface of elytra ; etol enlarged. From 



DIv. Bnt., IJ. S. Dept Agl. 



selves about the time the first elm leaf approaches full size, and 

 immediately feed, eating irregular holes through the leaf tissue. 

 If the beetles are at all numerous, the foliage, by the time that 

 it is fully out, will appear as if loads of shot had been fired through 

 it in every direction. During the latter part of May and in early 

 June, bottle-shaped eggs are laid on the under sides of the leaves. 



