Bui. 1 17, Bureau of Entomology, U. S. Dept. of Agriculture. 
Plate I. 
Fiq. 1.— Fallen Hopvine, Showing Characteristic Silvery Web and Clus- 
ters of Red Spiders (Tetranychus bimaculatus), Indicated by Arrows. 
(Original.) 
Fig. 2.— Fallen Hopvines, Showing Silvery Web, on which Red Spiders are 
Clustered. (Original.) 
WORK OF THE RED SPIDER ON HOPS. 
