﻿NO. 
  1134. 
  PHILIPPINE 
  ORNITHOLOGY— 
  WORCESTER 
  AND 
  BOVBNS. 
  577 
  

  

  Individuality 
  is 
  given 
  to 
  the 
  avifauna 
  of 
  these 
  four 
  islands 
  by 
  the 
  

   occurrence 
  of 
  the 
  following 
  vspecies, 
  the 
  known 
  distribution 
  of 
  which 
  is 
  

   indicated 
  in 
  the 
  table 
  : 
  

  

  Species 
  characteristic 
  of 
  the 
  Central 
  Philippines. 
  

  

  It 
  will 
  be 
  noted 
  that 
  all 
  but 
  ten 
  of 
  these 
  thirty-two 
  species 
  are, 
  so 
  far 
  as 
  

   we 
  at 
  present 
  know, 
  strictly 
  confined 
  to 
  Xegros, 
  Panay, 
  Guimaras, 
  and 
  

   Masbate. 
  Not 
  one 
  of 
  them 
  has 
  been 
  found 
  in 
  Bohol, 
  and 
  only 
  eight 
  of 
  

   them 
  are 
  known 
  to 
  occur 
  in 
  Cebu. 
  

  

  The 
  apparent 
  differences 
  between 
  Negros, 
  Panay, 
  and 
  Guimaras 
  

   which 
  this 
  table 
  brings 
  out 
  admit 
  of 
  ready 
  explanation. 
  It 
  will 
  be 
  

   noted 
  at 
  once 
  that 
  they 
  are 
  nearly 
  all 
  negative 
  — 
  i. 
  e., 
  they 
  consist 
  in 
  the 
  

   nondiscovery 
  in 
  some 
  of 
  the 
  islands 
  of 
  species 
  which 
  have 
  been 
  found 
  

   in 
  others. 
  In 
  but 
  a 
  single 
  case 
  have 
  we 
  an 
  instance 
  of 
  the 
  occurrence 
  

   of 
  different 
  representative 
  species 
  of 
  one 
  of 
  the 
  genera 
  of 
  this 
  table 
  in 
  

   any 
  two 
  of 
  these 
  islands. 
  

  

  If 
  we 
  compare 
  Negros 
  with 
  Panay, 
  for 
  instance, 
  we 
  note 
  that 
  Phaho- 
  

   ireron 
  maculipectus, 
  Halcyon 
  moseleyi, 
  Oriolus 
  nigrostriatns, 
  Aetliopyga 
  

   honita, 
  Byachy2)teryd'hrHuneiceps, 
  Turdus 
  nigrorum, 
  and 
  Cittocincla 
  nigra- 
  

   rum 
  are 
  recorded 
  from 
  Negros, 
  but 
  not 
  from 
  Panay. 
  

  

  Phabotreron 
  macuUpectus, 
  Aetliopyga 
  bonita, 
  and 
  BMnomyias 
  albigu- 
  

  

  laris 
  are 
  all 
  deej)woods 
  forms, 
  rare 
  and 
  shy. 
  

   Proc. 
  N. 
  M. 
  vol. 
  XX 
  37 
  

  

  Each 
  of 
  these 
  species 
  

  

  