﻿MAP 
  op 
  a 
  portion 
  of 
  WESTERN 
  NORTH 
  AMERICA 
  

  

  SHOWING 
  THEDISTRIBUTION 
  OF 
  VEGETATION 
  WITH 
  

   REFERENCE 
  TO 
  THE 
  MULTIPLICATION 
  OF 
  AND 
  M 
  EANS 
  OF 
  SUBDUING 
  THE 
  

   ROCKY 
  MOUNTAIN 
  LOCUST. 
  

   Prepared 
  under 
  the 
  direction 
  of* 
  the 
  U.S. 
  Entomological 
  Commission 
  

   By 
  Henry 
  Gannett 
  E.M. 
  

  

  