﻿60 
  EEPORT 
  UNITED 
  STATES 
  ENTOMOLOGICAL 
  COMMISSION. 
  

  

  this 
  species 
  begins 
  on 
  the 
  coast 
  of 
  Portugal 
  near 
  the 
  40th 
  parallel 
  of 
  

   north 
  latitude, 
  and 
  extends 
  from 
  thence 
  northeast 
  through 
  Spain, 
  ris- 
  

   ing 
  obliquely 
  through 
  France 
  to 
  Lake 
  Geneva, 
  and 
  extending 
  from 
  there 
  

   eastward, 
  following 
  approximately 
  the 
  48th 
  parallel, 
  including 
  Yalois, 
  

   Northern 
  Italy, 
  Oarinthia, 
  and 
  Hungary, 
  then 
  passing 
  into 
  Southern 
  

   Eussia, 
  where 
  it 
  reaches 
  nearly 
  to 
  the 
  55th 
  parallel. 
  It 
  continues 
  from 
  

   there 
  across 
  the 
  middle 
  of 
  Siberia, 
  passing 
  north 
  of 
  the 
  Chinese 
  bound- 
  

   ary, 
  and 
  terminates 
  in 
  Japan, 
  leaving 
  out 
  the 
  island 
  of 
  Niphon. 
  From 
  

   this 
  point 
  it 
  proceeds 
  southward 
  to 
  the 
  islands 
  of 
  Fidochi 
  to 
  New 
  Zea- 
  

   land 
  and 
  Australia, 
  of 
  which 
  it 
  embraces 
  only 
  the 
  northern 
  portion, 
  and 
  

   passes 
  from 
  thence 
  to 
  the 
  island 
  of 
  Mauritius, 
  and 
  rising 
  to 
  the 
  north 
  

   crosses 
  Africa 
  up 
  to 
  Madeira. 
  But 
  the 
  last 
  part 
  of 
  the 
  limits 
  is 
  more 
  

   hypothetical 
  from 
  want 
  of 
  exact 
  knowledge 
  in 
  reference 
  to 
  the 
  exist- 
  

   ence 
  of 
  the 
  species 
  in 
  the 
  interior 
  of 
  Africa. 
  

  

  That 
  the 
  immense 
  area 
  embraced 
  within 
  these 
  limits 
  is 
  permanently 
  

   inhabited, 
  even 
  in 
  the 
  broadest 
  sense, 
  by 
  P. 
  migratorius, 
  or 
  that 
  its 
  migra- 
  

   tions 
  extend 
  over 
  it 
  we 
  do 
  not 
  believe 
  can 
  be 
  shown. 
  And 
  if 
  we 
  judge 
  

   by 
  this 
  author's 
  paper 
  on 
  the 
  " 
  Destruction 
  of 
  the 
  locusts 
  in 
  Central 
  

   Eussia," 
  we 
  do 
  not 
  understand 
  him 
  as 
  really 
  holding 
  this 
  view. 
  

  

  We 
  will 
  give 
  some 
  reasons 
  for 
  believing 
  that 
  the 
  area 
  over 
  which 
  this 
  

   species 
  roams 
  is 
  less 
  extended 
  than 
  that 
  designated 
  by 
  the 
  boundary 
  

   given. 
  

  

  That 
  notices 
  of 
  specimens 
  obtained 
  from 
  the 
  extreme 
  portions 
  of 
  this 
  

   extensive 
  area 
  may 
  be 
  found 
  in 
  entomological 
  works 
  and 
  papers 
  we 
  do 
  

   not 
  deny 
  ; 
  but 
  this 
  we 
  do 
  not 
  accept 
  as 
  sufficient 
  to 
  establish 
  the 
  fact 
  

   that 
  the 
  species 
  is 
  to 
  be 
  found 
  in 
  these 
  widely 
  separated 
  sections 
  as 
  

   migratory. 
  That 
  a 
  species 
  may 
  be 
  thus 
  widely 
  distributed 
  we 
  do 
  not 
  

   -deny, 
  for 
  several 
  instances 
  of 
  the 
  kind 
  have 
  been 
  clearly 
  proved. 
  But 
  

   aside 
  from 
  the 
  difficulty 
  of 
  distinguishing 
  the 
  migratory 
  from 
  the 
  closely 
  

   allied 
  species 
  of 
  Acridii 
  by 
  single 
  specimens, 
  we 
  are 
  satisfied 
  that 
  the 
  

   evidences 
  in 
  reference 
  to 
  the 
  migratory 
  species 
  within 
  this 
  area 
  con- 
  

   tradict 
  Koppen's 
  conclusion 
  as 
  given 
  by 
  M. 
  Borre. 
  We 
  doubt 
  very 
  

   much 
  whether 
  there 
  is 
  an 
  entomologist 
  in 
  Europe 
  who, 
  without 
  previous 
  

   warning, 
  would 
  at 
  once 
  distinguish 
  between 
  G. 
  spretus 
  and 
  C. 
  atlantis. 
  

   These 
  differences 
  can 
  only 
  be 
  discovered 
  by 
  carefully 
  studying 
  the 
  species 
  

   in 
  their 
  native 
  habitats. 
  It 
  is 
  yet 
  a 
  matter 
  of 
  dispute 
  in 
  Europe 
  whether 
  

   P. 
  migratorius 
  and 
  P. 
  cinerascens 
  are 
  distinct 
  ; 
  and 
  the 
  testimony 
  in 
  

   reference 
  to 
  the 
  migratory 
  character 
  of 
  the 
  latter 
  is 
  so 
  conflicting 
  and 
  

   uncertain 
  that 
  we 
  are 
  unable 
  to 
  come 
  to 
  any 
  satisfactory 
  conclusion 
  on 
  

   the 
  point. 
  Yet 
  Koppen 
  fails 
  to 
  state 
  whether 
  he 
  considers 
  the 
  two 
  as 
  

   distinct 
  or 
  not. 
  

  

  Although 
  the 
  descriptions 
  given 
  by 
  travelers 
  are 
  generally 
  considered 
  

   as 
  worthless 
  in 
  determining 
  species, 
  yet 
  we 
  think 
  a 
  careful 
  study 
  of 
  the 
  

   numerous 
  accounts 
  and 
  a 
  proper 
  application 
  of 
  the 
  laws 
  of 
  insect 
  dis- 
  

   tribution, 
  if 
  compared 
  with 
  the 
  more 
  accurate 
  knowledge 
  of 
  these 
  pests 
  

   obtained 
  in 
  recent 
  years, 
  will 
  lead 
  to 
  more 
  correct 
  results 
  than 
  by 
  rely- 
  

  

  