﻿GENERAL 
  REPORT 
  FOR 
  1881. 
  • 
  35 
  

  

  of 
  these 
  Latched 
  the 
  following 
  spring 
  (187G) 
  and 
  the 
  locusts 
  from 
  them 
  

   left 
  without 
  depositing; 
  neither, 
  it 
  was 
  believed, 
  did 
  any 
  other 
  swarms 
  

   deposit 
  this 
  year. 
  However 
  this 
  may 
  have 
  been, 
  in 
  the 
  spring 
  of 
  1877 
  

   large 
  numbers 
  of 
  young 
  locusts 
  made 
  their 
  appearance 
  among 
  the 
  foot- 
  

   hills 
  on 
  the 
  north 
  side 
  of 
  Missoula 
  Eiver, 
  where 
  no 
  eggs 
  were 
  know^n 
  to 
  

   have 
  been 
  deposited 
  since 
  the 
  fall 
  of 
  1875. 
  ISTow, 
  whether 
  this 
  was 
  really 
  

   a 
  case 
  of 
  continued 
  vitality 
  of 
  a 
  large 
  quantity 
  of 
  eggs 
  during 
  an 
  entire 
  

   year 
  beyond 
  the 
  time 
  when 
  they 
  should 
  have 
  hatched, 
  as 
  claimed 
  by 
  

   these 
  gentlemen, 
  or 
  whether 
  in 
  1876 
  a 
  swarm 
  might 
  not, 
  unobserv^ed 
  by 
  

   them, 
  have 
  alighted 
  in 
  this 
  locality, 
  left 
  their 
  eggs, 
  and 
  then 
  gone 
  on, 
  I 
  

   will 
  not 
  try 
  to 
  decide, 
  but 
  will 
  let 
  every 
  one 
  draw 
  his 
  own 
  inference. 
  It 
  

   would 
  be 
  interesting, 
  however, 
  to 
  possess 
  the 
  facts 
  Avith 
  refeience 
  to 
  

   this 
  alleged 
  case 
  of 
  continued 
  vitality 
  of 
  locust 
  eggs 
  in 
  a 
  climate 
  where 
  

   under 
  ordinary 
  conditions 
  they 
  would 
  have 
  hatched 
  in 
  due 
  time. 
  

  

  The 
  time 
  required 
  for 
  the 
  hatching 
  of 
  the 
  eggs 
  varies 
  greatly 
  in 
  dif- 
  

   ferent 
  latitudes, 
  at 
  various 
  altitudes, 
  and 
  at 
  different 
  times 
  of 
  the 
  year. 
  

   The 
  presence 
  or 
  absence 
  of 
  warm 
  or 
  cool 
  rains, 
  too, 
  seems 
  to 
  make 
  a 
  dif- 
  

   ference. 
  Of 
  course 
  it 
  is 
  quite 
  necessary 
  that 
  a 
  certain 
  degree 
  of 
  heat 
  be 
  

   present, 
  as 
  also 
  a 
  certain 
  amount 
  of 
  moisture. 
  Sometimes 
  it 
  appears 
  

   that 
  eggs 
  w 
  ill 
  hatch 
  in 
  a 
  comparatively 
  short 
  time, 
  and 
  at 
  others, 
  when 
  

   there 
  is 
  no 
  perceptible 
  variation 
  in 
  the 
  conditions, 
  it 
  requires 
  much 
  

   longer. 
  

  

  Just 
  what 
  amount 
  of 
  heat 
  and 
  what 
  other 
  conditions 
  are 
  absolutely 
  

   necessary 
  for 
  the 
  development 
  of 
  the 
  eggs 
  in 
  the 
  Temporary 
  and 
  Per- 
  

   manent 
  Eegions, 
  or 
  whether 
  there 
  is 
  a 
  difference 
  in 
  these, 
  I 
  cannot 
  at 
  

   present 
  say, 
  with 
  the 
  small 
  amount 
  of 
  data 
  at 
  my 
  command. 
  But 
  that 
  

   there 
  are 
  certain 
  things 
  upon 
  w^hich 
  the 
  hatching 
  depends 
  can 
  be 
  readily 
  

   inferred 
  from 
  the 
  experiments 
  that 
  have 
  been 
  conducted 
  by 
  Professor 
  

   0. 
  Y. 
  Eiley 
  and 
  others 
  for 
  this 
  purpose. 
  Nevertheless, 
  they 
  were 
  in- 
  

   sufficient 
  to 
  establish 
  fixed 
  rules 
  by 
  which 
  we 
  can 
  go. 
  

  

  The 
  young, 
  after 
  hatching, 
  require 
  from 
  forty 
  to 
  sixty 
  days 
  in 
  which 
  to 
  

   mature 
  ; 
  varying, 
  of 
  course, 
  according 
  to 
  the 
  state 
  of 
  the 
  weather, 
  the 
  abun- 
  

   dance 
  of 
  food, 
  and 
  also 
  their 
  vigor; 
  cold 
  and 
  wet 
  retarding 
  and 
  warmth 
  

   favoring 
  their 
  growth. 
  Soon 
  after 
  hatching, 
  the 
  little 
  fellows 
  begin 
  

   traveling 
  in 
  search 
  of 
  food, 
  as 
  they 
  are 
  generally 
  hatched 
  on 
  grounds 
  

   partially 
  bare. 
  They 
  travel 
  in 
  droves, 
  thus 
  imitating 
  in 
  the 
  start 
  the 
  

   peculiar 
  traits 
  of 
  the 
  species. 
  These 
  droves 
  become 
  scattered 
  as 
  from 
  

   time 
  to 
  time 
  they 
  move 
  on 
  in 
  their 
  half 
  famished 
  search 
  for 
  food, 
  and 
  

   in 
  the 
  course 
  of 
  their 
  growth 
  become 
  so 
  scattered 
  and 
  mixed 
  up 
  that 
  

   b^^ 
  the 
  time 
  of 
  maturing 
  hardly 
  any 
  two 
  of 
  a 
  single 
  brood 
  are 
  together. 
  

   This 
  is 
  the 
  case 
  of 
  swarms 
  in 
  the 
  Temporary 
  Eegion, 
  and 
  very 
  likely 
  is 
  

   also 
  true 
  with 
  reference 
  to 
  them 
  in 
  their 
  native 
  habitat. 
  

  

  Soon 
  after 
  leaving 
  the 
  eggs 
  the 
  little 
  fellows 
  molt 
  or 
  shed 
  their 
  skin, 
  

   which 
  operation 
  is 
  repeated 
  four 
  more 
  times 
  in 
  most 
  cases 
  and 
  at 
  least 
  

   three 
  times 
  in 
  every 
  case 
  before 
  arriving 
  at 
  maturity. 
  The 
  manner 
  of 
  

   molting 
  is 
  quite 
  similar 
  to 
  the 
  like 
  act 
  with 
  other 
  insects. 
  The 
  larva 
  

  

  