﻿PREFACE. 
  

  

  This 
  report 
  was 
  planned 
  during 
  the 
  period 
  when 
  the 
  Commission 
  was 
  

   charged 
  by 
  Congress 
  with 
  the 
  investigation, 
  not 
  only 
  of 
  the 
  Eocky 
  

   Mountain 
  locust, 
  but 
  of 
  other 
  insects 
  injurious 
  to 
  agriculture. 
  Hence 
  

   it 
  is 
  divided 
  into 
  three 
  parts. 
  

  

  Part 
  I 
  embraces 
  chax>ters 
  on 
  the 
  Eocky 
  Mountain 
  locust 
  and 
  on 
  other 
  

   locusts 
  and 
  the 
  Western 
  cricket. 
  In 
  Chapter 
  I 
  some 
  additional 
  chrono- 
  

   logical 
  facts 
  for 
  the 
  years 
  1880 
  and 
  1881 
  are 
  given; 
  while 
  Chapters 
  II 
  

   and 
  III 
  contain 
  reports 
  of 
  observations 
  in 
  the 
  northwest 
  territories 
  for 
  

   the 
  years 
  1880 
  and 
  1881 
  respectively, 
  by 
  Mr. 
  Lawrence 
  Bruner. 
  It 
  has 
  

   been 
  the 
  object 
  of 
  the 
  Commission, 
  since 
  the 
  completion 
  of 
  the 
  work 
  on 
  

   which 
  our 
  first 
  and 
  second 
  reports 
  were 
  based, 
  to 
  have 
  the 
  breeding 
  

   grounds 
  of 
  the 
  locust 
  examined 
  annually, 
  as 
  far 
  as 
  possible, 
  with 
  a 
  

   view 
  of 
  ascertaining 
  the 
  prospects 
  of 
  injury 
  or 
  immunity 
  from 
  its 
  rav- 
  

   ages 
  the 
  ensuing 
  year. 
  Mr. 
  Bruner's 
  work 
  was 
  in 
  pursuance 
  of 
  this 
  

   object, 
  and 
  the 
  results 
  were 
  given 
  to 
  the 
  public 
  at 
  the 
  time, 
  pending 
  the 
  

   delayed 
  printing 
  of 
  this 
  volume. 
  

  

  In 
  Chapter 
  lY 
  Mr. 
  Bruner 
  has 
  also 
  given 
  a 
  list 
  of 
  the 
  species 
  of 
  locusts 
  

   known 
  in 
  North 
  America, 
  and 
  some 
  notes 
  on 
  the 
  Western 
  cricket. 
  

  

  Chapter 
  Y 
  contains 
  some 
  interesting 
  data, 
  by 
  Mr. 
  A. 
  H. 
  Swinton, 
  on 
  

   the 
  probable 
  connection 
  of 
  locust 
  multiplication 
  and 
  migration 
  with 
  solar 
  

   phenomena. 
  

  

  Part 
  II 
  embraces 
  three 
  chapters, 
  and 
  is 
  devoted 
  to 
  popular 
  treatises 
  

   on 
  three 
  well-known 
  injurious 
  insects 
  of 
  national 
  imiiortance. 
  

  

  Chapter 
  YI, 
  by 
  Mr. 
  EHey, 
  treats 
  of 
  the 
  Army 
  worm. 
  It 
  has 
  been 
  pre- 
  

   pared 
  with 
  a 
  view 
  of 
  presenting 
  a 
  full 
  and 
  connected 
  statement 
  of 
  all 
  

   that 
  is 
  known 
  in 
  reference 
  to 
  the 
  insect, 
  and 
  will 
  be 
  found 
  to 
  contain, 
  in 
  

   addition, 
  a 
  number 
  of 
  r.ecent 
  facts 
  and 
  observations 
  not 
  elsewhere 
  re- 
  

   corded. 
  

  

  Chapter 
  YII, 
  by 
  Mr. 
  Eiley, 
  treats 
  of 
  Canker 
  worms. 
  It 
  is 
  also 
  a 
  gen- 
  

   eral 
  account 
  of 
  these 
  destructive 
  insects, 
  prepared 
  with 
  a 
  view 
  of 
  bring- 
  

   ing 
  together 
  the 
  more 
  recent 
  discoveries 
  with 
  regard 
  to 
  them. 
  

  

  Chapter 
  YIII, 
  by 
  Mr. 
  Packard, 
  treats 
  in 
  a 
  similar 
  manner 
  of 
  the 
  Hes- 
  

   sian 
  fly, 
  and 
  is, 
  in 
  fact, 
  a 
  revised 
  edition 
  of 
  Bulletin 
  E'o. 
  5 
  on 
  that 
  insect. 
  

  

  Part 
  III 
  is 
  devoted 
  to 
  miscellaneous 
  subjects, 
  and 
  contains 
  the 
  more 
  

   technical 
  matter 
  of 
  the 
  report. 
  It 
  embraces 
  four 
  chapters 
  relating 
  to 
  

   the 
  development, 
  metamorphoses, 
  and 
  anatomy 
  of 
  the 
  locust 
  and 
  other 
  

   insects, 
  the 
  result 
  of 
  more 
  purely 
  scientific 
  studies 
  carried 
  on 
  with 
  

   the 
  more 
  practical 
  work 
  of 
  the 
  commission. 
  

  

  Chapter 
  IX, 
  by 
  Mr. 
  Packard, 
  contains 
  a 
  number 
  of 
  descriptions 
  of 
  the 
  

   larvae 
  of 
  injurious 
  forest 
  insects, 
  and 
  is 
  accompanied 
  by 
  numerous 
  figures 
  

   by 
  Dr. 
  Carl 
  P. 
  Gissler. 
  

  

  (XIII) 
  

  

  