﻿^v 
  

  

  

  * 
  /v 
  ^ 
  

  

  ;■.- 
  

  

  ' 
  V 
  

  

  BULLETIN 
  

  

  OF 
  

  

  ENTOMOLOGICAL 
  RESEARCH 
  

  

  ISSUED 
  BY 
  THE 
  IMPERIAL 
  

   BUREAU 
  OF 
  ENTOMOLOGY, 
  

  

  EDITOR; 
  THE 
  DIRECTOR. 
  

  

  VOL. 
  X. 
  

  

  LONDON: 
  

  

  1919-1920. 
  

  

  