﻿Bui. 
  117, 
  Bureau 
  of 
  Entomology, 
  U. 
  S. 
  Dept. 
  of 
  Agricultur 
  

  

  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. 
  

  

  