﻿MAP 
  of 
  apportion 
  roK 
  WESTERN 
  NORTH 
  AMERICA 
  

  

  SHOWINGTHEDISTRIBUTION 
  OF 
  VEGETATION 
  WITH 
  

   REFERENCE 
  TO 
  THE 
  MULTIPLICATION 
  OF 
  AN 
  D 
  M 
  EANS 
  OF 
  SUBDUING 
  THE 
  

   ROCKY 
  MOUNTAIN 
  LOCUST. 
  

   Prepared 
  under 
  I 
  In- 
  direction 
  of 
  the 
  l 
  T 
  .S.Kn(omological 
  CommissioTi 
  

   15v 
  Ilem-v 
  Gannett 
  KM. 
  

  

  