Bui. 1 10, Bureau of Entomology, U. S. Dept. of Agriculture. 



Plate IX. 



Fig. 1.— Brush Drag Used by the Junior Author in Experiments and also by 

 Farmers in Destroying the Spring Grain-Aphis in the Fields at Hobart, 

 Okla. (Original.) 



Fig. 2.— Roller Used in Experiments by Junior Author and by Farmers in 

 Destroying the Spring Grain-Aphis in Oklahoma. (Original.) 



