Apple and Thorn Skeletonizer 
Hemerophila pariana Clerck 
Work on apple leaves. The lower left-hand leaf shows a little 
feeding, the upper left-hand one a somewhat characteristic condi- 
tion on moderately infested trees, the upper right-hand leaf a more 
advanced stage of injury and the lower right-hand leaf practically 
completed skeletonizing with a somewhat characteristic rolled 
margin. (Author’s illustration from Cornell University Extension 
Bulletin 27) 
208 
