﻿48 
  REPORT 
  UNITED 
  STATES 
  ENTOMOLOGICAL 
  COMMISSION. 
  

  

  ritory, 
  and 
  thence 
  eastward 
  through 
  Idaho 
  into 
  portions 
  of 
  western 
  

   Montana, 
  where 
  it 
  commits 
  depredations 
  on 
  crops, 
  like 
  the 
  true 
  spretus^ 
  

   from 
  which 
  it 
  is 
  not 
  considered 
  distinct 
  by 
  the 
  inhabitants. 
  They 
  think 
  

   it 
  has 
  been 
  stunted 
  during 
  growth. 
  

  

  A 
  few 
  words 
  here 
  as 
  to 
  the 
  moveioents 
  of 
  locusts 
  in 
  these 
  parts 
  of 
  the 
  

   West 
  may 
  not 
  be 
  amiss. 
  All 
  those 
  swarms 
  that 
  come 
  into 
  this 
  western 
  

   regiou 
  from 
  the 
  north 
  and 
  east 
  are 
  composed 
  of 
  the 
  genuine 
  C. 
  spretus,. 
  

   while 
  those 
  that 
  leave 
  approach 
  nearer 
  to 
  atlanis. 
  The 
  movements 
  here 
  

   also 
  difler 
  to 
  some 
  extent 
  from 
  those 
  east 
  of 
  the 
  range, 
  where 
  there 
  are 
  

   long 
  stretches 
  of 
  plains 
  uninterrupted 
  by 
  mountain 
  ranges 
  and 
  belts 
  of 
  

   timber 
  as 
  they 
  are 
  in 
  the 
  mountainous 
  district 
  west. 
  Every 
  river 
  valley 
  

   and 
  mountain 
  chain 
  or 
  spur 
  has 
  a 
  tendency 
  to 
  change 
  the 
  course 
  or 
  to 
  

   retard 
  the 
  movements 
  of 
  swarms, 
  while 
  the 
  winds 
  for 
  the 
  greater 
  portion 
  

   of 
  the 
  year 
  are 
  contrary, 
  thus 
  adding 
  to 
  the 
  already 
  numerous 
  perplex- 
  

   ities. 
  To 
  understand 
  all 
  these 
  movements, 
  and 
  the 
  laws 
  by 
  which 
  they 
  

   are 
  regulated, 
  will 
  require 
  considerable 
  more 
  time 
  in 
  which 
  to 
  investigate. 
  

  

  Other 
  marked 
  varieties 
  of 
  this 
  insect 
  are 
  claimed 
  by 
  different 
  farmers 
  

   to 
  occur 
  in 
  isolated 
  sections 
  of 
  the 
  Northwest, 
  and 
  it 
  is 
  thought 
  these 
  

   differences 
  are 
  altogether 
  due 
  to 
  the 
  variations 
  in 
  the 
  climate 
  and 
  sur- 
  

   roundings. 
  For 
  my 
  part, 
  I 
  will 
  not 
  express 
  an 
  opinion 
  at 
  present, 
  as 
  I 
  

   have 
  not 
  had 
  sufficient 
  opportunity 
  to 
  examine 
  into 
  the 
  matter. 
  

  

  Although 
  in 
  the 
  field 
  from 
  the 
  middle 
  of 
  July 
  to 
  the 
  1st 
  of 
  JS"ovember, 
  

   I 
  saw 
  comparatively 
  few 
  of 
  these 
  locusts. 
  Nevertheless 
  at 
  almost 
  every 
  

   locality 
  where 
  I 
  stopped 
  off*, 
  a 
  few 
  of 
  them 
  were 
  seen. 
  

  

  While 
  out 
  on 
  the 
  plains 
  east 
  of 
  Greeley, 
  Colo., 
  August 
  6, 
  I 
  saw 
  a 
  few 
  

   flying 
  to 
  the 
  north. 
  They 
  were 
  the 
  most 
  numerous 
  at 
  about 
  2 
  o'clock 
  a. 
  

   m., 
  but 
  not 
  numerous 
  enough 
  to 
  cause 
  unnecessary 
  alarm. 
  After 
  this 
  I 
  

   saw 
  other 
  very 
  limited 
  flights 
  in 
  the 
  vicinity 
  of 
  Fort 
  Collins, 
  Golden^ 
  

   and 
  Denver. 
  Others 
  were 
  seen 
  on 
  the 
  ground 
  with 
  the 
  ''natives,'^ 
  

   but 
  nowhere 
  did 
  I 
  find 
  them 
  as 
  numerous 
  as 
  several 
  si)ecies 
  of 
  these 
  

   latter. 
  A 
  '' 
  swarm" 
  of 
  locusts 
  w^as 
  seen 
  on 
  Salt 
  Kiver, 
  a 
  branch 
  of 
  the 
  

   Snake 
  Eiver, 
  about 
  the 
  last 
  of 
  July, 
  by 
  W. 
  A. 
  Irwin, 
  of 
  Eawlins, 
  Wyo. 
  

   He 
  did 
  not, 
  however, 
  notice 
  any 
  of 
  them 
  in 
  the 
  air, 
  but 
  was 
  quite 
  posi- 
  

   tive 
  as 
  to 
  their 
  identit3^ 
  ^' 
  Could 
  not 
  have 
  mistaken 
  them, 
  as 
  had 
  seen 
  

   too 
  many 
  in 
  Kansas." 
  Another 
  swarm 
  of 
  this 
  locust 
  was 
  reported 
  as 
  

   having 
  hatched 
  in 
  the 
  vicinity 
  of 
  Deer 
  Lodge, 
  Mont., 
  the 
  present 
  year. 
  

   "All 
  at 
  once" 
  they 
  disappeared 
  and 
  w^ere 
  thought 
  to 
  have 
  been 
  destroyed 
  

   by 
  birds 
  and 
  insect 
  enemies, 
  as 
  none 
  were 
  seen 
  in 
  the 
  air. 
  Still 
  another 
  

   swarm 
  was 
  hatched 
  among 
  the 
  foot-hills 
  about 
  Missoula, 
  Mont., 
  where 
  

   they 
  did 
  some 
  injury 
  to 
  wild 
  grasses. 
  They 
  did 
  not 
  come 
  down 
  into 
  the 
  

   valley, 
  but 
  upon 
  " 
  getting 
  their 
  w 
  ings 
  became 
  very 
  restless 
  and 
  flew 
  about 
  

   as 
  if 
  not 
  knowing 
  which 
  direction 
  to 
  take."— 
  (Dukes.) 
  They 
  finally 
  

   left, 
  mostly 
  towards 
  the 
  south, 
  a 
  few, 
  however, 
  going 
  north. 
  Those 
  

   going 
  south 
  followed 
  uj) 
  the 
  Bitter 
  Eoot 
  and 
  its 
  tributaries, 
  while 
  those 
  

   going 
  north 
  drifted 
  towards 
  the 
  Flat 
  Head 
  Lake. 
  Other 
  swarms 
  of 
  

   locusts 
  were 
  seen 
  at 
  various 
  localities 
  on 
  the 
  Spokane 
  and 
  Snake 
  Eiver 
  

  

  