﻿5!I,S 
  rnuCEEDINliS 
  of 
  the 
  XJTIOXJL 
  MISEIM. 
  

  

  LAPAC 
  AND 
  SIASSI. 
  

  

  La])a<' 
  and 
  Siassi 
  lie 
  midway 
  between 
  Sulu 
  and 
  Tawi 
  Tawi. 
  Guille- 
  

   mard 
  is 
  tlie 
  only 
  collector 
  who 
  has 
  visited 
  them. 
  The 
  only 
  one 
  of 
  the 
  

   few 
  species 
  of 
  birds 
  obtained 
  there 
  by 
  him 
  which 
  throws 
  any 
  light 
  on 
  

   their 
  zoological 
  position 
  is 
  Ariamides 
  (juUlemardi, 
  but 
  we 
  have 
  no 
  cause 
  

   for 
  doubting 
  that 
  in 
  this 
  case 
  the 
  geographical 
  and 
  zoological 
  relation- 
  

   ships 
  correspond, 
  and 
  the 
  islands 
  belong 
  to 
  the 
  Sulu-Tawi 
  Tawi 
  group. 
  

  

  SI 
  HUTU. 
  

  

  Much 
  interest 
  attaches 
  to 
  Mr. 
  Everett's 
  recent 
  work 
  in 
  Sibutu, 
  which 
  

   had 
  been 
  up 
  to 
  that 
  time 
  held, 
  even 
  by 
  himself, 
  to 
  be 
  a 
  Bornean 
  island. 
  

   The 
  opinion 
  advanced 
  by 
  Guillemard, 
  and 
  reiterated 
  by 
  Everett, 
  that 
  

   the 
  Sibutu 
  Passage 
  marked 
  the 
  western 
  boundary 
  of 
  the 
  Philippines, 
  

   zoologically 
  speaking, 
  has 
  now 
  been 
  shown 
  to 
  be 
  erroneous. 
  

  

  The 
  old 
  ideas 
  were 
  based 
  not 
  so 
  much 
  on 
  the 
  avifauna 
  of 
  Sibutu, 
  

   which 
  was 
  almost 
  unknown, 
  as 
  on 
  the 
  supposed 
  conformation 
  of 
  the 
  sea 
  

   bottom, 
  the 
  charts 
  indicating 
  ''500 
  fathoms, 
  no 
  bottom," 
  in 
  the 
  middle 
  

   of 
  the 
  Sibutu 
  Passage, 
  as 
  Avell 
  as 
  at 
  a 
  point 
  nearer 
  the 
  Tawi 
  Tawi 
  shore. 
  

   Eecent 
  soundings 
  have 
  failed 
  to 
  establish 
  any 
  such 
  depth 
  of 
  water 
  in 
  

   the 
  positions 
  indicated, 
  and 
  it 
  has 
  also 
  been 
  shown 
  that 
  Sibutu 
  lies 
  

   bareli/ 
  within 
  the 
  hundred 
  fathom 
  line 
  of 
  Borneo. 
  

  

  Thanks 
  to 
  Mr. 
  Everett's 
  eftbrts, 
  the 
  number 
  of 
  birds 
  known 
  from 
  

   Sibutu 
  has 
  been 
  raised 
  to 
  .'50, 
  and, 
  although 
  the 
  island 
  is 
  apparently 
  

   poor 
  in 
  species, 
  the 
  presence 
  of 
  such 
  forms 
  as 
  Macropygia 
  tenuirostria, 
  

   PelargopHiH 
  giganted, 
  EHdynamis 
  mindaneiifiis, 
  Prioniturus 
  verticalis^ 
  

   Tanygnathus 
  luconensis, 
  Gorvus 
  phUijypinns, 
  Sarcops 
  calvus, 
  Caiornis 
  

   pmutyensh^ 
  Oriolus 
  chinetisis, 
  Ginnyris 
  JKgnhtris, 
  Hyloterpe 
  homeyeri, 
  

   lolc 
  huyiiahU^ 
  Artamides 
  gi(ilh'in<irdi, 
  ISij)hi(( 
  pliiUppinensiH, 
  and 
  Pitia 
  

   eryfhrogastra 
  leaves 
  no 
  room 
  for 
  doubt 
  that 
  Sibutu 
  is 
  zoologically 
  a.'* 
  

   well 
  as 
  politically 
  one 
  of 
  the 
  Philippine 
  Islands. 
  

  

  Pifta 
  iiixelleri 
  is 
  the 
  only 
  strictly 
  Bornean 
  form 
  yet 
  obtained 
  there. 
  

  

  The 
  island 
  has 
  two 
  peculiar 
  species, 
  Scopti 
  .sibutensis 
  and 
  Dicaeutu 
  

   sihuienHc, 
  but 
  on 
  the 
  whole 
  may 
  probably 
  be 
  held 
  to 
  belong 
  with 
  the 
  

   Sulu-Tawi 
  Tawi 
  group. 
  

  

  SUMMARY. 
  

  

  I 
  will 
  now 
  brietiy 
  restate 
  the 
  conclusions 
  thus 
  far 
  reached. 
  

  

  1. 
  The 
  Philippines 
  zoological 
  and 
  the 
  Philippines 
  political 
  are 
  not 
  

   identical 
  areas. 
  

  

  2. 
  Cagayan 
  Sulu, 
  Balabac, 
  Palawan, 
  and 
  the 
  Calamiaues 
  islands 
  are 
  

   Bornean. 
  

  

  3. 
  The 
  line 
  of 
  demarcation 
  between 
  the 
  Philippine 
  and 
  Bornean 
  

   islands 
  ])asses 
  between 
  Sibutu 
  and 
  the 
  coast 
  of 
  Borneo, 
  and 
  thence 
  

   northward 
  through 
  the 
  Sulu 
  Sea 
  and 
  Mindoro 
  Strait. 
  

  

  It 
  remains 
  to 
  be 
  determined 
  whether 
  it 
  runs 
  to 
  the 
  east 
  or 
  the 
  west 
  

   of 
  the 
  Cujos 
  Islands, 
  

  

  