﻿320 
  KEPORT 
  UNITED 
  STATES 
  ENTOMOLOGICAL 
  COMMISSION. 
  

  

  regions 
  of 
  the 
  Eocky 
  Mountains 
  which 
  will 
  ultimately 
  be 
  taken 
  up 
  by 
  

   settlers 
  as 
  farming 
  and 
  grazing 
  lands 
  ; 
  hence, 
  when 
  this 
  region 
  is 
  settled, 
  

   the 
  prevention 
  of 
  locust 
  injuries 
  will 
  be 
  a 
  problem 
  much 
  easier 
  of 
  solu- 
  

   tion 
  than 
  at 
  present. 
  

  

  " 
  The 
  effect 
  of 
  putting 
  this 
  large 
  area 
  under 
  more 
  or 
  less 
  thorough 
  

   cultivation, 
  either 
  as 
  irrigated 
  farms 
  or 
  cattle 
  and 
  sheep 
  ranges, 
  will 
  be 
  

   to 
  render 
  the 
  country 
  less 
  liable 
  to 
  great 
  and 
  prolonged 
  drought, 
  and 
  

   thus 
  cause 
  the 
  climate 
  to 
  be 
  more 
  equable. 
  All 
  this 
  will 
  tend 
  ultimately 
  

   to 
  keep 
  the 
  locust 
  within 
  its 
  normal 
  limits, 
  so 
  that 
  it 
  will 
  not 
  in 
  certain 
  

   favorable 
  years 
  multiply 
  to 
  so 
  great 
  an 
  extent 
  as 
  to 
  lead 
  to 
  extensive 
  

   migrations 
  into 
  adjoining 
  or 
  remote 
  regions. 
  The 
  locusts 
  will 
  be 
  re- 
  

   strained 
  within 
  their 
  natural 
  and 
  original 
  limits. 
  Hence 
  the 
  best 
  means 
  

   of 
  protection 
  will 
  be 
  to 
  destroy 
  the 
  eggs 
  and 
  to 
  light 
  the 
  young 
  when 
  

   they 
  hatch, 
  and 
  to 
  exterminate 
  them 
  by 
  all 
  the 
  methods 
  fully 
  described 
  

   in 
  the 
  First 
  Report 
  of 
  the 
  Commission. 
  The 
  greater 
  the 
  number 
  of 
  egga 
  

   and 
  young 
  destroyed 
  within 
  the 
  Permanent 
  Region 
  year 
  after 
  year, 
  over 
  

   a 
  period 
  of 
  25 
  or 
  50 
  years, 
  the 
  more 
  will 
  the 
  number 
  of 
  individuals 
  

   throughout 
  the 
  whole 
  area 
  be 
  lessened. 
  

  

  "The 
  settlement 
  of 
  Montana 
  and 
  the 
  western 
  border 
  of 
  Dakota 
  will 
  

   ultimately 
  have 
  a 
  great 
  effect 
  in 
  lessening 
  the 
  extent 
  of 
  the 
  breeding 
  

   grounds 
  of 
  the 
  locust 
  $ 
  and 
  thus 
  diminish 
  the 
  numbers 
  of 
  those 
  which 
  

   swarm 
  into 
  Utah 
  on 
  the 
  one 
  hand, 
  and 
  Minnesota, 
  Iowa, 
  and 
  Nebraska 
  

   on 
  the 
  other. 
  

  

  "The 
  State 
  of 
  Colorado 
  is 
  invaded 
  by 
  swarms 
  which 
  originate 
  west 
  of 
  

   the 
  range 
  about 
  the 
  White 
  and 
  Bear 
  Rivers, 
  and 
  north 
  and 
  northwest 
  

   from 
  the 
  Wind 
  River 
  Valley 
  and 
  the 
  Laramie 
  plains 
  of 
  Wyoming, 
  so 
  

   that 
  these 
  regions 
  are 
  the 
  tracts 
  which 
  need 
  to 
  be 
  occupied, 
  and 
  where 
  

   an 
  unremitting 
  warfare, 
  pursued 
  with 
  combined 
  effort 
  year 
  after 
  year 
  

   by 
  the 
  farmers, 
  will 
  ultimately 
  tend 
  to 
  keep 
  the 
  locust 
  within 
  compara- 
  

   tively 
  harmless 
  bounds. 
  

  

  " 
  To 
  this 
  end 
  the 
  replanting 
  of 
  the 
  forests, 
  now 
  being 
  recklessly 
  cut 
  down 
  

   by 
  the 
  settlers 
  of 
  the 
  Western 
  Territories, 
  will 
  have 
  a 
  favorable 
  effect, 
  

   both 
  tending 
  to 
  reduce 
  the 
  extremes 
  in 
  the 
  seasons, 
  and 
  to 
  break 
  up 
  and 
  

   diminish 
  the 
  breeding 
  grounds 
  of 
  the 
  locust. 
  Moreover, 
  the 
  construction 
  

   of 
  railroads 
  and 
  the 
  settlements 
  which 
  spring 
  up 
  along 
  them 
  will 
  have 
  

   their 
  effect 
  in 
  reducing 
  the 
  extent 
  of 
  the 
  breeding 
  grounds. 
  

  

  " 
  The 
  settlement 
  also 
  of 
  the 
  wild 
  lands 
  of 
  the 
  Rocky 
  Mountain 
  plateau 
  

   will 
  in 
  a 
  measure 
  tend 
  to 
  keep 
  the 
  locusts 
  from 
  migrating 
  eastward. 
  

   If 
  there 
  were 
  a 
  sufficiency 
  of 
  food 
  in 
  the 
  plateau 
  region, 
  there 
  would 
  be 
  

   no 
  inducement 
  for 
  them 
  to 
  take 
  flight 
  for 
  regions 
  situated 
  five 
  hundred 
  

   to 
  a 
  thousand 
  miles 
  eastward, 
  for 
  without 
  much 
  doubt 
  the 
  main 
  cause 
  

   of 
  their 
  migration 
  is 
  the 
  desire 
  for 
  food 
  ; 
  for 
  if 
  the 
  broad, 
  extended 
  plains 
  

   of 
  the 
  region 
  between 
  the 
  mountains 
  and 
  the 
  Mississippi 
  Basin 
  do 
  not 
  

   afford 
  them 
  sufficient 
  food, 
  they 
  will 
  pass 
  on 
  to 
  the 
  prairie 
  region 
  of 
  the 
  

   western 
  edge 
  of 
  the 
  Mississippi 
  Basin. 
  

  

  " 
  While, 
  therefore, 
  we 
  do 
  not 
  see 
  how 
  any 
  special 
  means 
  of 
  extermi- 
  

  

  