﻿Letters, 
  Extracts, 
  Notices, 
  ^c. 
  467 
  

  

  rhamphus 
  from 
  the 
  different 
  islands, 
  they 
  will 
  find 
  that 
  they 
  

   belong 
  to 
  insular 
  forms 
  perfectly 
  distinct 
  from 
  one 
  another. 
  

  

  I 
  take 
  this 
  opportunity 
  also 
  to 
  answer 
  some 
  remarks 
  on 
  

   the 
  Cyayiurhamphus 
  from 
  Antipodes 
  Island, 
  made 
  by 
  Mr. 
  H. 
  O. 
  

   Forbes 
  in 
  the 
  last 
  number 
  of 
  ' 
  The 
  Ibis 
  ' 
  (p. 
  280) 
  . 
  Whether 
  

   this 
  bird, 
  which 
  no 
  doubt 
  is 
  C. 
  hochstetteri, 
  Reischek, 
  is 
  

   different, 
  as 
  I 
  am 
  inclined 
  to 
  believe, 
  or 
  not 
  from 
  C. 
  erythrotis 
  

   from 
  the 
  Macquarie 
  Islands, 
  is 
  a 
  question 
  which 
  must 
  be 
  left 
  

   sub 
  judice 
  till 
  we 
  have 
  a 
  good 
  series 
  of 
  specimens 
  from 
  both 
  

   localities 
  to 
  be 
  compared 
  together. 
  Till 
  then 
  I 
  think 
  it 
  safer 
  

   to 
  consider 
  the 
  Antipodes-Island 
  bird 
  distinct, 
  more 
  especially 
  

   as, 
  besides 
  some 
  slight 
  differences, 
  C. 
  hochstetteri 
  and 
  C 
  ery- 
  

   throtis 
  have 
  different 
  habitats, 
  a 
  fact 
  which 
  warns 
  us 
  to 
  be 
  

   very 
  cautious 
  before 
  we 
  identify 
  birds 
  from 
  different 
  islands. 
  

   In 
  this 
  particular 
  case 
  caution 
  is 
  the 
  more 
  necessary 
  because 
  

   the 
  only 
  available 
  specimen 
  from 
  Antipodes 
  Island 
  (brought 
  

   home 
  by 
  Mr. 
  H. 
  O. 
  Forbes, 
  and 
  now 
  in 
  the 
  British 
  Museum) 
  

   is 
  imperfect 
  and 
  without 
  a 
  tail. 
  

  

  I 
  am, 
  Sir, 
  

   Zoological 
  Museum, 
  Turin, 
  Yours 
  &C., 
  

  

  April 
  21st, 
  1893. 
  T. 
  Salvador:. 
  

  

  Sir, 
  — 
  I 
  should 
  like 
  to 
  correspond 
  with 
  residents 
  in 
  this 
  

   country 
  who 
  are 
  interested 
  in 
  the 
  subject 
  of 
  the 
  migration 
  

   of 
  various 
  birds. 
  There 
  are 
  certainly 
  many 
  routes 
  taken, 
  

   but 
  the 
  greater 
  part 
  of 
  these 
  routes 
  are 
  indefinable, 
  as 
  the 
  

   inland 
  being 
  so 
  very 
  uniform 
  in 
  character, 
  the 
  migrants, 
  as 
  

   a 
  rule, 
  travel 
  direct, 
  instead 
  of 
  following 
  rivers 
  or 
  valleys. 
  

   Why 
  some 
  birds, 
  such 
  as 
  Atectrurus 
  risorius, 
  TcBnioptera 
  

   dominicana, 
  and 
  Myiotheretes 
  rufiventris, 
  should 
  only 
  be 
  found 
  

   migrating 
  due 
  south-east 
  and 
  north-west, 
  and 
  breeding 
  (except 
  

   the 
  last) 
  150 
  miles 
  south 
  and 
  100 
  miles 
  west 
  of 
  Buenos 
  Aires, 
  

   and 
  never 
  appearing 
  nearer 
  to 
  the 
  capital, 
  except 
  as 
  stragglers 
  

   en 
  route, 
  is 
  very 
  puzzling. 
  Agelaus 
  flavus 
  is 
  also 
  only 
  found, 
  

   though 
  resident, 
  beyond 
  this 
  same 
  limit. 
  In 
  fact, 
  one 
  could 
  

   draw 
  a 
  line 
  beyond 
  which 
  certain 
  species 
  are 
  never 
  found, 
  

   so 
  that 
  their 
  occurrence 
  would 
  tell 
  the 
  traveller 
  in 
  which 
  

   part 
  of 
  the 
  country 
  he 
  was 
  not, 
  without 
  other 
  guides. 
  

  

  