﻿CHAPTER 
  XII. 
  

  

  NOTE 
  OK 
  THE 
  GEOGEAPHIOAL 
  DISTEIBFTION 
  OF 
  THE 
  

   EOOKY 
  MOUNTAIN 
  LOCUST, 
  ILLUSTEATED 
  WITH 
  A 
  0OL-, 
  

   OEED 
  ZOO-GEOGEAPHICAL 
  MAP 
  OF 
  NOETH 
  AMEEIOA. 
  

  

  In 
  the 
  first 
  report 
  of 
  the 
  Commission 
  (Chapter 
  YI, 
  p. 
  136) 
  we 
  traced 
  

   the 
  geographical 
  limits 
  of 
  the 
  Eocky 
  Mountain 
  locust, 
  giving 
  its 
  east- 
  

   ern, 
  northern, 
  western, 
  and 
  its 
  approximate 
  southern 
  limits 
  5 
  the 
  latter 
  

   being 
  farther 
  perfected 
  and 
  revised 
  in 
  Chapter 
  YI 
  of 
  our 
  second 
  re- 
  

   port, 
  and 
  in 
  the 
  colored 
  map 
  accompanying 
  the 
  rej)ort. 
  On 
  page 
  108 
  

   of 
  our 
  second 
  report 
  we 
  also 
  showed 
  that 
  the 
  geographical 
  limits 
  of 
  the 
  

   western 
  cricket 
  (species 
  of 
  Anabras) 
  "are 
  probabl3^ 
  nearly 
  or 
  quite 
  co- 
  

   extensive 
  with 
  those 
  of 
  the 
  Eocky 
  Mountain 
  locust." 
  

  

  For 
  the 
  convenience 
  of 
  the 
  general 
  reader, 
  as 
  well 
  as 
  of 
  naturalists, 
  

   we 
  have, 
  with 
  the 
  permission 
  of 
  Dr. 
  F. 
  Y. 
  Hayden, 
  reproduced, 
  with 
  

   certain 
  minor 
  corrections, 
  a 
  colored 
  zoo-geographical 
  map 
  of 
  North 
  

   America. 
  It 
  was 
  originally 
  prepared 
  to 
  illustrate 
  the 
  distribution 
  of 
  

   certain 
  fresh-water 
  Crustacea 
  (Phyllopods) 
  and 
  appears 
  in 
  the 
  Twelfth 
  

   Annual 
  Eeport 
  of 
  the 
  United 
  States 
  Geological 
  Survey 
  of 
  the 
  Terri- 
  

   tories. 
  Upon 
  sending 
  a 
  proof 
  to 
  Mr. 
  J. 
  A. 
  Allen, 
  who 
  has 
  paid 
  special 
  

   attention 
  to 
  the 
  geographical 
  distribution 
  of 
  the 
  mammals 
  and 
  birds, 
  

   he 
  kindly 
  returned 
  it 
  without 
  corrections, 
  stating 
  that 
  it 
  agreed 
  with 
  

   his 
  views 
  as 
  to 
  the 
  limits 
  of 
  the 
  zoological 
  regions 
  and 
  provinces. 
  

   Another 
  copy 
  was 
  sent 
  to 
  Prof. 
  A. 
  E. 
  Yerrill, 
  who 
  made 
  some 
  corrections 
  

   in 
  the 
  eastern 
  province 
  around 
  the 
  Bay 
  of 
  Fundy, 
  and 
  a 
  few 
  less 
  im- 
  

   portant 
  changes. 
  Hence 
  it 
  is 
  believed 
  that 
  the 
  map 
  will*rei>resent 
  with 
  

   tolerable 
  accuracy 
  the 
  zoological 
  distribution 
  not 
  only 
  of 
  the 
  insects 
  in 
  

   general, 
  but 
  of 
  nearly 
  all 
  the 
  other 
  classes 
  of 
  the 
  animal 
  kingdom, 
  ex- 
  

   cluding 
  the 
  marine 
  forms. 
  

  

  The 
  range 
  of 
  the 
  Eocky 
  Mountain 
  locust 
  is 
  co-equal 
  with 
  the 
  light- 
  

   brown 
  area, 
  i. 
  e., 
  the 
  Central 
  Province, 
  except 
  that 
  it 
  will 
  i)robably 
  not 
  

   be 
  found 
  south 
  of 
  the 
  isothermal 
  of 
  72°. 
  This 
  province 
  is 
  also 
  the 
  home 
  

   of 
  the 
  species 
  of 
  Anabrus 
  or 
  Western 
  Crickets. 
  These 
  are 
  among 
  the 
  

   most 
  characteristic 
  Orthoptenus 
  insects 
  to 
  be 
  found 
  in 
  this 
  province, 
  

   although 
  there 
  are 
  many 
  other 
  species 
  not 
  to 
  be 
  found 
  elsewhere. 
  On 
  

   the 
  other 
  hand, 
  the 
  common 
  red-legged 
  locust, 
  Galoptenus 
  femur 
  -ruhrum^ 
  

   occurs 
  all 
  over 
  the 
  Boreal 
  or 
  Canadian, 
  the 
  Eastern, 
  the 
  Western 
  

   (Pacific), 
  as 
  well 
  as 
  the 
  Central 
  Province, 
  so 
  that 
  it 
  ranges 
  over 
  the 
  

   whole 
  of 
  North 
  America 
  south 
  of 
  the 
  limit 
  of 
  trees 
  and 
  north 
  of 
  Mexico 
  

   and 
  Lower 
  California. 
  The 
  distribution 
  of 
  a 
  third 
  species, 
  Galoptenus 
  

   atlanis, 
  is 
  nearly 
  co-exteilsive 
  with 
  that 
  of 
  C. 
  femur 
  -ruhr 
  urn 
  , 
  although 
  it 
  

  

  346 
  

  

  