﻿126 
  THE 
  ZOOLOGIST. 
  

  

  and 
  on 
  the 
  north 
  hank, 
  are 
  quite 
  unknown 
  in 
  Angola; 
  and 
  the 
  

   ordinary 
  Grey 
  Parrot, 
  which 
  is 
  to 
  be 
  seen 
  in 
  flocks 
  on 
  the 
  Congo, 
  

   is 
  almost 
  unknown 
  to 
  the 
  south, 
  the 
  only 
  exception 
  to 
  this 
  rule, 
  

   as 
  far 
  as 
  I 
  have 
  been 
  able 
  to 
  ascertain, 
  being 
  at 
  Cassange, 
  about 
  

   three 
  hundred 
  miles 
  to 
  the 
  interior 
  of 
  Loando, 
  where 
  the 
  rare 
  

   ' 
  King- 
  Par 
  rot,' 
  with 
  red 
  feathers 
  distributed 
  among 
  the 
  grey 
  

   ones, 
  is 
  not 
  uncommon. 
  Of 
  small 
  birds, 
  I 
  have 
  noticed 
  many 
  'at 
  

   Cabinda 
  that 
  I 
  never 
  observed 
  in 
  Angola 
  ; 
  the 
  same 
  with 
  butter- 
  

   flies 
  and 
  other 
  insects."* 
  Most 
  of 
  these 
  last 
  statements 
  have 
  

   been 
  traversed 
  by 
  Sir 
  H. 
  Johnston, 
  who 
  writes 
  : 
  — 
  " 
  I 
  have 
  read 
  

   in 
  many 
  works 
  on 
  Africa, 
  or 
  on 
  the 
  distribution 
  of 
  plants 
  and 
  

   animals, 
  that 
  the 
  Congo 
  was 
  the 
  southern 
  boundary 
  of 
  the 
  

   habitat 
  of 
  the 
  Grey 
  Parrot, 
  the 
  Anthropoid 
  Apes, 
  and 
  the 
  oil- 
  

   palm 
  (Elais 
  guineensis) 
  . 
  Now 
  the 
  Grey 
  Parrot 
  reaches 
  perhaps 
  

   its 
  greatest 
  development 
  in 
  Malanje, 
  a 
  district 
  of 
  Angola 
  nearly 
  

   three 
  hundred 
  miles 
  south 
  of 
  the 
  Congo, 
  and, 
  together 
  with 
  the 
  

   oil-palm, 
  continues 
  to 
  be 
  found 
  as 
  far 
  as 
  the 
  tenth 
  degree 
  south 
  

   of 
  the 
  equator 
  ; 
  while 
  the 
  Anthropoid 
  Apes 
  can 
  hardly 
  be 
  said 
  

   to 
  be 
  limited 
  southward 
  in 
  their 
  distribution 
  by 
  the 
  lower 
  courses 
  

   of 
  the 
  Congo, 
  for 
  they 
  do 
  not 
  reach 
  even 
  to 
  its 
  northern 
  bank, 
  

   or 
  approach 
  it 
  nearer 
  than 
  Landana, 
  one 
  hundred 
  miles 
  away."t 
  

   More 
  evidence 
  is 
  evidently 
  required 
  here, 
  and 
  that 
  of 
  an 
  analytical 
  

   nature. 
  In 
  most 
  instances 
  an 
  average 
  result 
  can 
  alone 
  be 
  

   expected, 
  for 
  it 
  is 
  scarcely 
  reasonable 
  to 
  believe 
  that 
  animal 
  

   migration 
  — 
  both 
  intentional 
  and 
  accidental 
  — 
  was 
  rendered 
  alto- 
  

   gether 
  nugatory 
  by 
  even 
  the 
  mighty 
  stream 
  of 
  the 
  Congo, 
  

   exceeding 
  in 
  volume 
  all 
  the 
  rivers 
  in 
  the 
  Eastern 
  Hemisphere, 
  

   and 
  in 
  the 
  west 
  surpassed 
  by 
  the 
  Amazons 
  alone 
  ; 
  while 
  at 
  the 
  

   same 
  time 
  it 
  is 
  not 
  unreasonable 
  to 
  suppose 
  that 
  in 
  earlier 
  times 
  

   its 
  separative 
  character 
  on 
  the 
  fauna 
  was 
  more 
  pronounced, 
  for 
  

   animal 
  migration 
  is 
  spasmodic, 
  and 
  requires 
  time 
  for 
  perpetua- 
  

   tion 
  in 
  result. 
  Dr. 
  Gadow, 
  in 
  one 
  of 
  the 
  British 
  Museum 
  Cata- 
  

   logues 
  of 
  Birds, 
  has 
  recorded 
  the 
  interesting 
  fact 
  that 
  specimens 
  

   of 
  Lanius 
  collaris 
  from 
  the 
  Congo 
  have 
  a 
  red 
  under 
  surface, 
  south 
  

   of 
  the 
  Congo 
  this 
  colour 
  is 
  changed 
  to 
  orange.! 
  Mr. 
  Beddard 
  

  

  ::: 
  'Angola,' 
  vol. 
  i. 
  p. 
  53. 
  

  

  | 
  ' 
  The 
  River 
  Congo,' 
  p. 
  318. 
  

  

  I 
  This 
  requires 
  qualification, 
  as 
  Ogilvie-Grant, 
  in 
  a 
  recent 
  revision 
  of 
  the 
  

   Shrikes, 
  specific-all}- 
  divides 
  the 
  specimens 
  placed 
  hy 
  Gadow 
  as 
  appertaining 
  

   to 
  Lanius 
  collaris 
  (' 
  Novitates 
  Zoologies,' 
  vol. 
  ix. 
  p. 
  406). 
  

  

  