April, '19] 



JOURNAL OF ECONOMIC ENTOMOLOGY 



Plate 5 



1. Tup of potato plant from ca^e in which leafhojjpers were placed; 2. Top of 

 check plant from field; 3. Top of plant from which all hopjwrs were removed; 

 3. (Lower electro.) Potato leaf showing hopi)eil)urn and the cast skins of the loafhop- 

 pers producing it. 



