Bui. 11 0, Bureau of Entomology, U. S. Dept. of Agricultur 
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.) 
