﻿4G 
  REPORT 
  UNITED 
  STATES 
  ENTOMOLOGICAL 
  COMMISSION. 
  

  

  1873, 
  when 
  a 
  swarm 
  left 
  the 
  southern 
  part 
  of 
  the 
  State, 
  and 
  did 
  not 
  

   ahght 
  again 
  until 
  the 
  following 
  day, 
  when 
  it 
  came 
  down 
  in 
  the 
  north- 
  

   ern 
  part 
  of 
  the 
  State, 
  having 
  flown 
  about 
  two 
  hundred 
  miles 
  before 
  

   coming 
  down 
  to 
  feed. 
  Other 
  small 
  swarms 
  have 
  frequently 
  come 
  

   during 
  the 
  night 
  and 
  eaten 
  fields 
  of 
  grain 
  before 
  morning. 
  A 
  case 
  of 
  

   this 
  kind 
  occurred 
  in 
  1865, 
  near 
  Fort 
  Calhoun, 
  Kebr. 
  In 
  the 
  eveoing 
  no 
  

   'hoppers 
  were 
  to 
  be 
  seen, 
  but 
  on 
  the 
  dawn 
  of 
  the 
  following 
  day 
  they 
  had 
  

   appeared 
  and 
  eaten 
  the 
  greater 
  part 
  of 
  a 
  field 
  of 
  corn. 
  

  

  The 
  majority 
  of 
  cases 
  where 
  swarms 
  have 
  been 
  known 
  to 
  continue 
  

   their 
  flights 
  into 
  the 
  night 
  are 
  confined 
  to 
  the 
  Temj)orary 
  Kegion, 
  and 
  

   during 
  the 
  earlier 
  part 
  of 
  the 
  year 
  when 
  they 
  are 
  working 
  their 
  way 
  

   northward 
  with 
  south 
  winds. 
  The 
  further 
  north 
  they 
  i)roceed, 
  and 
  the 
  

   closer 
  to 
  the 
  Permanent 
  Region, 
  the 
  fewer 
  are 
  these 
  unnatural 
  flights. 
  

   This 
  is 
  undoubtedly 
  due 
  to 
  the 
  comparative 
  coolness 
  of 
  the 
  atmosphere 
  

   in 
  these 
  high 
  latitudes 
  and 
  great 
  altitudes, 
  which 
  anyone 
  knows 
  is 
  a 
  

   restriction 
  to 
  their 
  activity. 
  Moonlight 
  nights, 
  too, 
  are 
  preferred 
  for 
  

   these 
  journe3^s 
  in 
  preference 
  to 
  dark 
  and 
  cloudy 
  ones. 
  

  

  Although 
  the 
  general 
  rule 
  is 
  for 
  this 
  insect 
  to 
  be 
  single-brooded, 
  it 
  

   does 
  occasionally 
  by 
  its 
  position 
  and 
  migrations 
  succeed 
  in 
  becoming 
  

   double-brooded. 
  Swarms 
  reared 
  in 
  Texas 
  in 
  early 
  spring 
  sometimes 
  

   reach 
  Nebraska 
  and 
  even 
  Southern 
  Dakota 
  in 
  early 
  May. 
  These 
  gen- 
  

   erally 
  leave 
  eggs 
  that 
  hatch 
  in 
  about 
  a 
  month, 
  thereby 
  giving 
  the 
  young 
  

   the 
  months 
  of 
  July 
  and 
  August 
  in 
  which 
  to 
  mature. 
  These, 
  however, 
  

   it 
  is 
  claimed, 
  never 
  amount 
  to 
  much, 
  on 
  account 
  of 
  the 
  abnormal 
  condi- 
  

   tions 
  under 
  which 
  they 
  are 
  developed, 
  and 
  very 
  rarely 
  deposit 
  eggs. 
  

  

  In 
  the 
  mountain 
  district 
  of 
  Montana 
  and 
  Idaho, 
  as 
  well 
  as 
  in 
  i)ortions 
  

   of 
  the 
  Temporary 
  Region, 
  I 
  have 
  noticed 
  that 
  after 
  the 
  majority 
  of 
  the 
  

   young 
  were 
  full-grown 
  there 
  were 
  still 
  others 
  ai)parently 
  just 
  hatched. 
  

   ]S^ow, 
  it 
  may 
  be 
  that 
  some 
  of 
  the 
  instances 
  of 
  so 
  called 
  double-brooded- 
  

   ness 
  in 
  this 
  insert, 
  if 
  critically 
  examined, 
  would 
  prove 
  to 
  be 
  the 
  hatching 
  

   of 
  eggs 
  that 
  through 
  various 
  causes 
  had 
  been 
  letarded 
  longer 
  than 
  

   usual. 
  That 
  this 
  unevenness 
  in 
  hatching 
  is 
  of 
  frequent 
  if 
  not 
  regular 
  

   occurrence, 
  anyone 
  who 
  has 
  taken 
  the 
  least 
  pains 
  to 
  ascertain 
  will 
  

   know 
  5 
  but 
  however 
  common 
  this 
  may 
  be, 
  there 
  are 
  and 
  have 
  been 
  occa- 
  

   sionally' 
  instances 
  in 
  which 
  the 
  evidence 
  favoring 
  double 
  brooded 
  ness 
  

   could 
  not 
  well 
  be 
  doubted. 
  We 
  may 
  then 
  take 
  it 
  for 
  granted 
  that 
  un- 
  

   der 
  certain 
  conditions 
  it 
  is 
  not 
  only 
  j^ossible^ut 
  actually 
  true 
  that 
  

   C. 
  spretus 
  becomes 
  double-brooded. 
  Yet 
  cases 
  of 
  this 
  kind 
  arecomi)ar- 
  

   atively 
  few. 
  

  

  SUB 
  PERMANENT 
  REGION. 
  

  

  Immediately 
  joining 
  the 
  Permanent 
  Region 
  of 
  this 
  locust, 
  and 
  lying 
  

   between 
  it 
  and 
  the 
  regions 
  temporarily 
  visited, 
  is 
  a 
  tract 
  of 
  country 
  

   possessing 
  in 
  part 
  the 
  characteristics 
  of 
  both 
  of 
  these 
  regions. 
  This 
  sec- 
  

   tion 
  of 
  country, 
  as 
  would 
  naturally 
  be 
  supposed, 
  is 
  oftener 
  visited 
  by 
  

   swarms 
  of 
  locusts 
  from 
  the 
  north 
  and 
  west 
  than 
  are 
  the 
  various 
  portions 
  

  

  