﻿inhabiting 
  the 
  Chatham 
  Islands. 
  535 
  

  

  Island 
  and 
  gamboge-green 
  in 
  the 
  Magellan 
  birds. 
  Sir 
  

   Walter's 
  description 
  o£ 
  P. 
  imperialis 
  also 
  conflicts 
  with 
  itself 
  

   in 
  several 
  points. 
  In 
  describing 
  the 
  young 
  of 
  tliis 
  Chatham- 
  

   Island 
  bird 
  he 
  says 
  " 
  lower 
  back 
  and 
  rump 
  glossed 
  with 
  

   steel-blue 
  instead 
  of 
  green 
  as 
  in 
  the 
  adult/' 
  and 
  " 
  there 
  is 
  

   likewise 
  a 
  blue 
  gloss 
  intermixed 
  ivith 
  the 
  green 
  on 
  the 
  head 
  

   and 
  hind 
  neck 
  " 
  ; 
  whereas 
  his 
  words 
  in 
  describing 
  the 
  adult 
  

   on 
  the 
  same 
  page 
  are 
  : 
  '^ 
  back, 
  rump, 
  thighs, 
  and 
  upper 
  tail- 
  

   coverts 
  dark 
  purplish 
  or 
  steel-blue/' 
  and 
  ''head, 
  including 
  

   the 
  crest, 
  cheeks, 
  hind 
  part 
  and 
  sides 
  of 
  neck 
  . 
  . 
  . 
  dark 
  

   purplish 
  or 
  steel-blue 
  with 
  a 
  beautiful 
  gloss." 
  

  

  The 
  mid-line 
  of 
  the 
  gular 
  region 
  in 
  the 
  Chatham-Island 
  

   bird 
  is 
  plumose, 
  while 
  in 
  the 
  S. 
  -American 
  form 
  it 
  is 
  not 
  so. 
  

   The 
  bird 
  from 
  the 
  former 
  locality 
  is 
  also 
  described 
  in 
  the 
  

   work 
  cited 
  as 
  "having 
  the 
  feathers 
  composing 
  the 
  alar 
  bar 
  

   largely 
  tipped 
  with 
  white/' 
  while 
  in 
  the 
  latter 
  the 
  bar 
  is 
  

   formed 
  of 
  a 
  line 
  of 
  white 
  feathers 
  in 
  the 
  wing-coverts. 
  

  

  From 
  the 
  fact 
  that 
  in 
  some 
  birds 
  in 
  mature 
  and 
  splendid 
  

   pkimage 
  there 
  occurs 
  either 
  no 
  dorsal 
  spot 
  or 
  no 
  alar 
  bar, 
  

   and 
  that 
  in 
  others 
  both 
  alar 
  bar 
  and 
  dorsal 
  spot 
  are 
  wanting, 
  

   I 
  am 
  very 
  strongly 
  of 
  opinion 
  that 
  both 
  these 
  characters 
  are 
  

   neither 
  sexual 
  nor 
  seasonal, 
  but 
  truly 
  specific. 
  In 
  the 
  young 
  

   of 
  those 
  species 
  which 
  ultimately 
  have 
  an 
  alar 
  bar, 
  it 
  appears 
  

   in 
  the 
  young 
  birds, 
  but 
  at 
  what 
  precise 
  age 
  I 
  am 
  unable 
  to 
  say, 
  

   as 
  a 
  pale 
  line 
  in 
  the 
  grey 
  of 
  the 
  wing, 
  as 
  may 
  be 
  seen 
  in 
  

   the 
  young 
  of 
  Phalacrocorax 
  iinperialis 
  from 
  the 
  Straits 
  

   of 
  Magellan, 
  in 
  P. 
  albiventris 
  , 
  and 
  in 
  P. 
  rothschildi 
  (a 
  

   new 
  species 
  which 
  I 
  describe 
  below) 
  in 
  the 
  collection 
  of 
  

   the 
  British 
  Museum. 
  Sir 
  Walter 
  Buller 
  states 
  that 
  the 
  

   young 
  birds 
  of 
  P. 
  carunculatus 
  (that 
  is, 
  the 
  New-Zealand 
  

   bird) 
  in 
  their 
  first 
  year's 
  plumage 
  have 
  no 
  dorsal 
  spot 
  and 
  

   no 
  alar 
  bar. 
  Both 
  these 
  characters 
  must, 
  therefore, 
  appear 
  

   after 
  the 
  first 
  yea'". 
  In 
  none 
  of 
  tJje 
  specimens 
  of 
  P. 
  albi- 
  

   ventris 
  in 
  the 
  British 
  Museum 
  which 
  I 
  have 
  examined 
  (and 
  

   there 
  are 
  some 
  of 
  them 
  quite 
  mature 
  and 
  in 
  magnificent 
  

   plumage) 
  is 
  there 
  any 
  dorsal 
  spot. 
  Mr. 
  Sclater 
  has 
  pointed 
  

   out 
  that 
  in 
  none 
  of 
  the 
  examples 
  of 
  P. 
  verrucosus 
  is 
  there 
  

   the 
  slightest 
  appearance 
  of 
  either 
  a 
  dorsal 
  spot 
  or 
  an 
  alar 
  

  

  