﻿GENERAL 
  REPORT 
  FOR 
  1881. 
  25 
  

  

  numbers 
  5 
  and 
  if 
  this 
  be 
  true, 
  changing 
  these 
  characteristics 
  would 
  nec- 
  

   essarily 
  result 
  in 
  their 
  diminution, 
  unless 
  they 
  really 
  can 
  continue 
  to 
  

   exist 
  in 
  such 
  immense 
  numbers 
  in 
  a 
  region 
  the 
  surface 
  of 
  which 
  is 
  dif- 
  

   ferent 
  from 
  the 
  foregoing. 
  Judging 
  from 
  experience 
  and 
  from 
  the 
  past 
  

   history 
  of 
  this 
  locust,-! 
  should 
  say 
  that 
  it 
  would 
  not 
  and 
  cannot 
  con- 
  

   tinue 
  under 
  such 
  changed 
  conditions. 
  For, 
  if 
  it 
  could 
  breed 
  only 
  in 
  

   limited 
  areas, 
  it 
  would 
  of 
  necessity 
  become 
  less 
  numerous. 
  Also, 
  when 
  

   traveling 
  it 
  would 
  become 
  more 
  scattered, 
  and 
  would 
  then 
  be 
  more 
  apt 
  

   to 
  be 
  kept 
  in 
  check 
  by 
  locust-feeding 
  birds 
  in 
  connection 
  with 
  insects 
  

   and 
  other 
  enemies 
  which 
  lurk 
  in 
  the 
  recesses 
  of 
  forests 
  and 
  about 
  groves 
  

   and 
  meadows. 
  Always 
  with 
  the 
  advance 
  of 
  settlement 
  birds 
  and 
  in- 
  

   sect-devouring 
  animals 
  of 
  a 
  certain 
  class 
  make 
  their 
  appearance, 
  and 
  

   do 
  much 
  towards 
  keeping 
  in 
  check 
  these 
  pests. 
  As 
  examples 
  of 
  these 
  I 
  

   have 
  the 
  pleasure 
  of 
  introducing 
  the 
  robin, 
  quail, 
  orioles, 
  sparrows, 
  blue- 
  

   birds, 
  and 
  other 
  species 
  that 
  love 
  to 
  hang 
  about 
  the 
  abodes 
  of 
  man 
  — 
  all 
  

   of 
  which 
  are 
  great 
  insect-destroyers. 
  

  

  Not 
  only 
  in 
  the 
  above 
  ways, 
  then, 
  will 
  advance 
  of 
  civilization 
  and 
  the 
  

   settling 
  of 
  this 
  area 
  tend 
  to 
  diminish 
  the 
  locust 
  in 
  numbers, 
  but 
  it 
  will 
  

   also 
  prevent 
  their 
  increase. 
  

  

  As 
  already 
  intimated, 
  there 
  is 
  a 
  tract 
  of 
  country 
  in 
  the 
  West 
  and 
  IlTorth- 
  

   west 
  which, 
  by 
  its 
  peculiar 
  characteristics, 
  is 
  especially 
  adax)ted 
  to 
  the 
  

   modes 
  of 
  life 
  of 
  this 
  locust; 
  hence 
  it 
  has 
  been 
  termed 
  the 
  Permanent 
  

   Eegion 
  by 
  the 
  members 
  of 
  the 
  Commission 
  heretofore 
  referred 
  to. 
  

  

  Although 
  this 
  insect 
  at 
  times 
  visits 
  and 
  breeds 
  throughout 
  the 
  greater 
  

   portion 
  of 
  the 
  country 
  lying 
  west 
  of 
  the 
  Mississippi 
  Eiver 
  and 
  east 
  of 
  

   the 
  Cascade 
  range 
  of 
  mountains, 
  it 
  is 
  partial 
  to 
  a 
  particular 
  portion 
  of 
  

   this 
  vast 
  area 
  that 
  possesses 
  peculiar 
  climatic 
  conditions. 
  This 
  region 
  

   can 
  be 
  bounded 
  as 
  follows 
  : 
  On 
  the 
  east 
  by 
  a 
  line 
  beginning 
  on 
  the 
  

   south, 
  at 
  the 
  junction 
  of 
  the 
  thirty-seventh 
  parallel 
  with 
  the 
  one 
  hundred 
  

   and 
  sixth 
  meridian, 
  and 
  running 
  in 
  a 
  northeasterly 
  direction 
  to 
  the 
  ninety- 
  

   ninth 
  meridian 
  on 
  the 
  forty-fifth 
  parallel, 
  whence 
  the 
  course 
  changes 
  to 
  

   the 
  north 
  until 
  the 
  boundary 
  line 
  is 
  reached, 
  where 
  it 
  inclines 
  to 
  the 
  

   northwest 
  in 
  a 
  curve 
  and 
  strikes 
  the 
  fifty-third 
  parallel 
  at 
  about 
  the 
  one 
  

   hundred 
  and 
  third 
  meridian. 
  The 
  northern 
  boundary 
  is 
  the 
  commence- 
  

   ment 
  of 
  the 
  trans-continental 
  timber 
  region 
  of 
  British 
  America. 
  On 
  the 
  

   west 
  this 
  region 
  is 
  bounded 
  by 
  a 
  line 
  nearly 
  coincident 
  with 
  the 
  one 
  

   hnndred 
  and 
  seventeenth 
  meridian, 
  sometimes 
  running 
  to 
  the 
  east, 
  and 
  

   at 
  other 
  times 
  to 
  the 
  west 
  of 
  it, 
  and 
  towards 
  the 
  south 
  making 
  an 
  abrupt 
  

   angle 
  to 
  the 
  southeast 
  to 
  avoid 
  the 
  desert 
  regions 
  of 
  southern 
  Nevada 
  

   and 
  a 
  i)ortion 
  of 
  southwestern 
  Utah. 
  The 
  features 
  of 
  this 
  entire 
  region, 
  

   or 
  at 
  least 
  of 
  those 
  portions 
  of 
  it 
  chosen 
  by 
  this 
  locust 
  as 
  breeding- 
  

   grounds, 
  are 
  its 
  comparative 
  aridity 
  and 
  freedom 
  from 
  timber. 
  

  

  This 
  region 
  is 
  divided 
  as 
  follows 
  into 
  several 
  districts 
  that 
  differ 
  in 
  

   surface 
  configuration: 
  The 
  Mountain 
  Eegion, 
  the 
  Plateau 
  Eegion, 
  the 
  

   Eegion 
  of 
  Plains, 
  and 
  the 
  Basin 
  Eegion. 
  

  

  The 
  Plateau 
  Eegion, 
  which 
  is 
  generally 
  termed 
  the 
  Colorado 
  Plateaus, 
  

  

  