﻿GENERAL 
  REPORT 
  FOR 
  1881. 
  47 
  

  

  of 
  the 
  Temporary 
  Eegion, 
  since 
  it 
  is 
  mucli 
  more 
  favorably 
  situated. 
  

   This 
  region, 
  too, 
  possesses 
  the 
  chief 
  characteristics 
  of 
  the 
  Permanent 
  

   Eegion^ 
  but 
  slightly 
  modified, 
  and 
  hence 
  answers 
  as 
  a 
  sort 
  of 
  '^ 
  stepping 
  

   stone" 
  in 
  the 
  passage 
  of 
  swarms 
  from 
  one 
  region 
  to 
  the 
  other. 
  Here 
  it 
  

   is 
  that 
  quite 
  frequently 
  great 
  numbers 
  stop 
  to 
  breed 
  in 
  their 
  flights 
  from 
  

   the 
  northwest 
  towards 
  the 
  settlements 
  of 
  Minnesota, 
  Nebraska, 
  and 
  

   other 
  portions 
  of 
  these 
  Temporary 
  Eegions. 
  Here 
  they 
  make 
  provision 
  

   for 
  a 
  fresh 
  start 
  the 
  following 
  season 
  — 
  not 
  the 
  same 
  locusts, 
  but 
  their 
  

   offspring. 
  On 
  their 
  return 
  flights 
  also 
  this 
  intermediate 
  location 
  is 
  used 
  

   by 
  the 
  stragglers 
  and 
  those 
  that 
  come 
  from 
  the 
  far 
  south 
  as 
  breeding 
  

   grounds. 
  

  

  This 
  region 
  is 
  confined 
  to 
  the 
  eastern 
  rather 
  than 
  to 
  the 
  western 
  range 
  

   of 
  the 
  migratory 
  locust 
  — 
  unless 
  we 
  also 
  term 
  the 
  entire 
  western 
  breed- 
  

   ing 
  grounds, 
  the 
  Western 
  Temporary 
  Eegion. 
  This, 
  however, 
  we 
  would 
  

   hardly 
  dare 
  to 
  do, 
  since 
  in 
  these 
  parts 
  it 
  is 
  enabled 
  to 
  continue 
  year 
  af- 
  

   ter 
  year 
  for 
  an 
  indefinite 
  length 
  of 
  time 
  without 
  showing 
  the 
  least 
  signs 
  

   of 
  disease 
  and 
  of 
  dwindling. 
  This 
  interior 
  basin 
  and 
  western 
  mountain 
  

   region 
  being 
  at 
  a 
  greater 
  elevation 
  than 
  the 
  region 
  lying 
  to 
  the 
  east, 
  to 
  

   which 
  has 
  been 
  given 
  the 
  name 
  of 
  the 
  Sub-permanent 
  Eegion, 
  more 
  

   closely 
  resembles 
  the 
  true 
  home 
  or 
  Permanent 
  Eegion, 
  and 
  hence 
  its 
  not 
  

   being 
  included 
  under 
  that 
  name. 
  

  

  Having 
  already 
  noticed 
  the 
  partiality 
  this 
  insect 
  possesses 
  for 
  a 
  cool 
  

   climate, 
  we 
  would 
  naturally 
  and 
  truly 
  suppose 
  that 
  it 
  would 
  be 
  boreal 
  

   in 
  its 
  nature. 
  This 
  being 
  the 
  case, 
  we 
  would 
  expect 
  to 
  find 
  it 
  the 
  most 
  

   numerous 
  and 
  enjoying 
  the 
  greatest 
  immunity 
  from 
  all 
  sorts 
  of 
  deterio- 
  

   rating 
  influences 
  to 
  the 
  northward. 
  This, 
  at 
  least, 
  is 
  the 
  fact. 
  The 
  

   farther 
  north 
  we 
  go 
  in 
  the 
  interior 
  basin 
  of 
  the 
  Mississippi 
  and 
  Missouri 
  

   Eivers, 
  the 
  more 
  at 
  home 
  do 
  we 
  find 
  the 
  locust. 
  At 
  present, 
  however, 
  

   it 
  is 
  not 
  possible 
  to 
  give 
  the 
  exact 
  tem])erature 
  and 
  other 
  agencies 
  that 
  

   are 
  requisite 
  for 
  this 
  insect's 
  greatest 
  increase. 
  

  

  While 
  this 
  insect 
  appears 
  to 
  be 
  the 
  only 
  species 
  that 
  increases 
  so 
  

   rapidly 
  and 
  becomes 
  very 
  numerous 
  east 
  of 
  the 
  Eocky 
  Mountains, 
  there 
  

   are 
  several 
  other 
  closely 
  allied 
  species, 
  or 
  rather 
  varieties, 
  that 
  at 
  times 
  

   become 
  quite 
  numerous 
  west 
  of 
  this 
  range 
  of 
  mountains. 
  These 
  un- 
  

   doubtedly 
  are 
  but 
  local 
  forms 
  of 
  C. 
  sjyretus, 
  produced 
  by 
  climatic 
  and 
  

   other 
  influences. 
  Of 
  these 
  other 
  locusts, 
  one 
  in 
  particular 
  at 
  times 
  

   becomes 
  very 
  numerous, 
  and 
  moves 
  in 
  swarms 
  precisely 
  like 
  those 
  of 
  

   the 
  true 
  or 
  migratory 
  species, 
  C. 
  spretiis, 
  and 
  possesses 
  habits 
  almost 
  

   identical 
  with 
  tho<e 
  of 
  that 
  locust. 
  This 
  is 
  the 
  G. 
  atlanis 
  Eiley, 
  treated 
  

   of 
  in 
  the 
  first 
  Eeport 
  of 
  the 
  Commission. 
  It 
  is 
  confined 
  to 
  a 
  locality 
  

   having 
  the 
  peculiar 
  climatic 
  conditions 
  of 
  the 
  Permanent 
  Eegion, 
  some- 
  

   what 
  modified 
  by 
  the 
  presence 
  of 
  a 
  greater 
  amount 
  of 
  moisture 
  and 
  an 
  

   increase 
  of 
  temperature, 
  also 
  an 
  increase 
  in 
  the 
  timbered 
  area. 
  This 
  

   region 
  is 
  confined 
  to 
  the 
  mountain 
  districts 
  of 
  eastern 
  Oregon, 
  and 
  a 
  

   l^ortion 
  of 
  northern 
  Nevada, 
  with, 
  perhaps, 
  a 
  small 
  area 
  in 
  southwest- 
  

   ern 
  Idaho. 
  This 
  insect 
  frequently 
  drifts 
  north 
  into 
  Washington 
  Ter- 
  

  

  