﻿160 
  REPORT 
  UNITED 
  STATES 
  ENTOMOLOGICAL 
  COMMISSION. 
  

  

  valley 
  of 
  the 
  Upper 
  Big 
  Horn 
  region, 
  were 
  not 
  included 
  in 
  the 
  Per- 
  

   manent 
  Region, 
  for 
  want 
  of 
  sufficient 
  data. 
  The 
  boundary 
  of 
  the 
  per- 
  

   manent 
  breeding 
  grounds 
  has 
  then 
  to 
  be 
  extended 
  considerably 
  to 
  the 
  

   west, 
  so 
  as 
  to 
  include 
  the 
  patch 
  in 
  Northern 
  Utah 
  and 
  the 
  region 
  in 
  

   Idaho 
  lying 
  south 
  of 
  Virginia 
  City, 
  Montana. 
  This 
  makes 
  the 
  Perma- 
  

   nent 
  Region 
  an 
  uninterrupted 
  rudely 
  triangular 
  or 
  oval 
  area, 
  widest 
  on 
  

   the 
  Northern 
  United 
  States 
  boundary 
  line, 
  aud 
  narrowing 
  southward, 
  

   the 
  apex 
  of 
  the 
  triangle 
  or 
  smaller 
  end 
  of 
  the 
  oval 
  resting 
  near 
  the 
  

   southern 
  line 
  of 
  Colorado, 
  on 
  or 
  near 
  the 
  37th 
  parallel 
  of 
  latitude. 
  

  

  North 
  of 
  the 
  44th 
  parallel 
  the 
  Permanent 
  Eegion 
  has 
  been 
  extended 
  

   eastward 
  to 
  a 
  line 
  nearly 
  identical 
  with 
  the 
  eastern 
  border 
  of 
  the 
  

   Plateau 
  of 
  the 
  Ooteau 
  of 
  the 
  Missouri, 
  extending 
  northward 
  through 
  

   the 
  Turtle 
  Mountains 
  and 
  to 
  the 
  region 
  lying 
  a 
  little 
  west 
  of 
  Manitoba. 
  

  

  In 
  New 
  Mexico, 
  the 
  region 
  periodically 
  visited 
  has 
  been 
  extended 
  

   southward 
  to 
  Fort 
  Craig, 
  New 
  Mexico, 
  and 
  made 
  to 
  include 
  the 
  north 
  

   eastern 
  section 
  of 
  Arizona. 
  

  

  These 
  alterations 
  have 
  been 
  made 
  in 
  the 
  colored 
  map 
  of 
  the 
  arable 
  

   lands, 
  etc., 
  accompanying 
  this 
  report. 
  

  

  CHAPTER 
  VII. 
  

   SUMMARY 
  OF 
  LOCUST 
  FLIGHTS 
  FROM 
  1877 
  TO 
  1879. 
  

  

  FLIGHTS 
  IN 
  1877. 
  

  

  We 
  have 
  prepared 
  the 
  accompanying 
  maps 
  (Nos. 
  2-4) 
  in 
  order 
  to 
  give 
  

   at 
  a 
  glance 
  a 
  succinct 
  view 
  of 
  the 
  leading 
  facts 
  regarding 
  the 
  distribu- 
  

   tion 
  of 
  the 
  hatching-grounds 
  and 
  course 
  taken 
  by 
  the 
  resulting 
  swarms 
  

   in 
  1877, 
  1878, 
  and 
  1879, 
  respectively. 
  These 
  maps 
  may 
  be 
  compared 
  

   with 
  those 
  for 
  1874 
  and 
  1876 
  in 
  the 
  First 
  Annual 
  Report 
  of 
  the 
  Com- 
  

   mission. 
  

  

  The 
  majority 
  of 
  the 
  facts 
  regarding 
  the 
  nights 
  iu 
  1877 
  are 
  taken 
  from 
  

   the 
  First 
  Annual 
  Report. 
  By 
  looking 
  at 
  Map 
  No. 
  2 
  (1877) 
  it 
  will 
  be 
  

   seen 
  that 
  the 
  large 
  majority 
  of 
  the 
  hatching-grounds 
  were 
  those 
  made 
  

   by 
  the 
  locusts 
  which 
  invaded 
  the 
  Temporary 
  Region, 
  lying 
  in 
  general 
  

   east 
  of 
  the 
  104th 
  meridian, 
  in 
  1870. 
  It 
  will 
  be 
  remembered 
  that 
  the 
  

   young 
  of 
  these 
  locusts 
  hatched 
  in 
  the 
  spring 
  of 
  1877, 
  and, 
  while 
  most 
  of 
  

   them 
  were 
  killed 
  by 
  the 
  cold 
  and 
  late 
  rains, 
  many 
  winged 
  their 
  way 
  

   towards 
  the 
  Northwest, 
  some 
  dropping 
  down 
  and 
  alighting 
  by 
  the 
  way, 
  

   while 
  a 
  comparatively 
  few 
  reached 
  the 
  permanent 
  breeding-grounds 
  on 
  

   the 
  Rocky 
  Mountain 
  Plateau, 
  whence 
  their 
  progenitors 
  of 
  the 
  year 
  pre- 
  

   vious 
  departed 
  for 
  the 
  regions 
  lying 
  to 
  the 
  southwest. 
  

  

  A 
  few 
  scattered 
  arrows 
  without 
  barbs 
  will, 
  however, 
  be 
  seen 
  in 
  Texas, 
  

   Indian 
  Territory, 
  Western 
  Arkansas, 
  Southeastern 
  Kansas, 
  Southeast- 
  

   ern 
  Nebraska, 
  Southeastern 
  Dakota, 
  Western 
  Iowa, 
  and 
  Southwestern 
  

   Minnesota. 
  These 
  indicate 
  the 
  scattered 
  flights 
  which, 
  late 
  in 
  the 
  sea- 
  

  

  