﻿482 
  Mr. 
  S. 
  B. 
  J. 
  Skertcbly 
  on 
  Butterflies' 
  Enemies. 
  

  

  satisfactory 
  to 
  a 
  hungry 
  healthy 
  bird 
  when 
  caught. 
  Dragon- 
  

   flies 
  enjoy 
  similar 
  safety 
  for 
  like 
  reasons. 
  

  

  VI. 
  The 
  Raison 
  d'etre 
  of 
  Protective 
  Resemblance. 
  

  

  Applying 
  the 
  law 
  that 
  the 
  amount 
  of 
  apprehended 
  danger 
  

   is 
  measurable 
  by 
  the 
  efforts 
  taken 
  to 
  avoid 
  it 
  to 
  protective 
  

   resemblance, 
  and 
  remembering 
  the 
  almost 
  universality 
  of 
  

   protective 
  resemblance, 
  the 
  conclusion 
  is 
  forced 
  upon 
  us 
  that 
  

   butterflies 
  when 
  at 
  rest 
  are 
  or 
  were 
  in 
  far 
  greater 
  danger 
  than 
  

   when 
  on 
  the 
  wing. 
  At 
  first 
  sight 
  this 
  seems 
  axiomatic, 
  since 
  

   it 
  is 
  clear 
  that 
  more 
  foes 
  are 
  capable 
  of 
  capturing 
  a 
  sleeping 
  

   than 
  a 
  flying 
  prey. 
  But 
  when 
  we 
  see 
  how 
  comparatively 
  

   rare 
  mimicry 
  is, 
  and 
  how 
  almost 
  universal 
  protective 
  resem- 
  

   blance 
  is, 
  it 
  is 
  hard 
  to 
  escape 
  the 
  conclusion 
  that 
  if, 
  as 
  sug- 
  

   gested, 
  the 
  one 
  refers 
  to 
  dangers 
  almost 
  past, 
  the 
  other 
  has 
  

   reference 
  to 
  dangers 
  coeval 
  with 
  butterfly 
  life 
  and 
  imminent 
  

   up 
  to 
  the 
  present 
  time. 
  We 
  must 
  remember 
  that 
  a 
  collection 
  

   of 
  proved 
  mimetic 
  forms 
  (many 
  are 
  spurious) 
  can 
  be 
  got 
  into 
  

   a 
  cabinet 
  — 
  a 
  collection 
  of 
  protected 
  forms 
  requires 
  a 
  museum. 
  

   I 
  wish 
  instead 
  of 
  reading 
  this 
  argument, 
  for 
  it 
  reads 
  feeble, 
  

   entomologists 
  could 
  be 
  with 
  me 
  here 
  day 
  after 
  day, 
  month 
  

   after 
  month, 
  with 
  all 
  the 
  wealth 
  of 
  tropic 
  forms 
  about 
  me, 
  to 
  

   realize 
  the 
  great 
  fact 
  that 
  one 
  looks 
  upon 
  a 
  new 
  case 
  of 
  

   mimicry 
  as 
  a 
  prize, 
  but 
  that 
  a 
  non-protected-resemblance 
  

   species 
  is 
  a 
  greater 
  prize 
  still. 
  

  

  Butterflies 
  rest 
  by 
  day 
  partly, 
  by 
  night 
  always. 
  All 
  

   butterflies 
  rest 
  a 
  little 
  by 
  day, 
  while 
  they 
  suck 
  flowers 
  or 
  

   leaves, 
  for 
  in 
  Borneo 
  more 
  butterflies 
  . 
  rest 
  on 
  leaves 
  than 
  

   flowers 
  and 
  many 
  leaves 
  are 
  aromatic. 
  For 
  instance, 
  most 
  

   species 
  of 
  Nacaduba, 
  Tajura, 
  Poritia 
  (Blues), 
  and 
  even 
  

   Apias 
  (Whites) 
  live 
  upon 
  leaves 
  and 
  are 
  rarely 
  seen 
  at 
  

   flowers. 
  Other 
  butterflies 
  are 
  crepuscular, 
  like 
  Melanitis 
  and 
  

   Thaumantis, 
  and 
  these 
  rest 
  nearly 
  all 
  clay. 
  Hence 
  most 
  of 
  a 
  

   butterfly's 
  life 
  is 
  spent 
  resting. 
  Even 
  if 
  foes 
  were 
  as 
  expert 
  

   (as 
  swallows 
  are 
  with 
  flies) 
  in 
  capturing 
  flying 
  as 
  resting 
  

   insects, 
  most 
  would 
  be 
  killed 
  while 
  at 
  rest. 
  But 
  while 
  only 
  

   birds 
  can 
  catch 
  flying 
  butterflies, 
  birds, 
  lizards, 
  ants, 
  and 
  

   beetles 
  can 
  capture 
  them 
  when 
  at 
  rest. 
  

  

  The 
  necessity 
  for 
  good 
  protection 
  while 
  at 
  rest 
  is 
  therefore 
  

   great, 
  and 
  hence 
  we 
  see 
  protective 
  resemblance 
  so 
  common 
  • 
  

   hence 
  we 
  see 
  it 
  almost 
  exclusively 
  applied 
  to 
  the 
  under 
  sur- 
  

   face 
  — 
  the 
  exposed 
  surface 
  in 
  a 
  state 
  of 
  repose. 
  

  

  The 
  struggle 
  for 
  existence 
  in 
  Borneo 
  is 
  glaringly 
  apparent. 
  

   The 
  country 
  is 
  warm, 
  moist, 
  with 
  perpetual 
  summer. 
  Insect- 
  

   and 
  plant-life 
  thrive 
  to 
  a 
  degree 
  not 
  realizable 
  at 
  home 
  and 
  

  

  