﻿MAP 
  < 
  if 
  a 
  portion 
  o. 
  WESTERN 
  XORTH 
  AMERICA 
  

  

  SHOWINGTHEDISTRIBUTION 
  OF 
  VEGETATION 
  WITH 
  

  

  REFERENCE 
  TO 
  THE 
  MULTIPLICATION 
  OFAIND 
  MEANSOF 
  SUBDUING 
  THE 
  

  

  ROCKY 
  MOUNTAIN 
  LOCUST. 
  

  

  jjrepared 
  undertlLe 
  direction 
  of 
  the 
  U.S. 
  Entomological 
  Commission 
  

  

  Hv 
  Henry 
  Gannett 
  E.M. 
  

  

  1879. 
  

  

  z 
  Map 
  I. 
  

  

  * 
  MIDDLE 
  

  

  Z 
  EASTERN 
  SECTI 
  

  

  Provable 
  Breeding 
  Grounds. 
  

  

  SafteTiiuulaiul 
  semi-desert. 
  Desert 
  

  

  BorestLand. 
  L 
  - 
  x„, 
  o.s.lyiM.n^l. 
  

  

  Grass 
  covered. 
  Bwsily 
  burue. 
  

  

  