﻿80 
  Mr. 
  C. 
  B. 
  Williams 
  on 
  

  

  reaching 
  its 
  height 
  in 
  the 
  SanJFernando 
  district 
  about 
  the 
  

   30th 
  September, 
  and 
  continuing 
  in 
  gradually 
  reduced 
  

   numbers 
  until 
  the 
  4th 
  October, 
  and 
  in 
  a 
  few 
  locahties 
  as 
  

   late 
  as 
  the 
  12th 
  October. 
  The 
  most 
  remarkable 
  feature 
  of 
  

   this 
  southern 
  flight 
  was 
  that 
  in 
  the 
  Cedros 
  district, 
  which 
  is 
  

   on 
  the 
  northern 
  edge 
  of 
  the 
  south-western 
  promontory 
  

   near 
  its 
  end 
  (see 
  Plate 
  X) 
  ; 
  the 
  butterflies 
  were 
  flying 
  con- 
  

   tinually 
  and 
  in 
  large 
  numbers 
  towards 
  the 
  east 
  approxim- 
  

   ately 
  from 
  the 
  26th 
  September 
  to 
  the 
  2nd 
  October, 
  while 
  at 
  

   La 
  Brea 
  a 
  httle 
  further 
  north-east 
  few 
  were 
  seen 
  until 
  the 
  

   4th 
  October, 
  when 
  they 
  were 
  flying 
  in 
  numbers 
  in 
  the 
  usual 
  

   westerly 
  direction. 
  

  

  Unfortunately 
  there 
  are 
  no 
  records 
  for 
  the 
  sea 
  passage 
  

   between 
  Trinidad 
  and 
  Venezuela 
  at 
  this 
  point, 
  and 
  it 
  is 
  

   impossible 
  to 
  say 
  if 
  the 
  butterflies 
  went 
  across 
  here, 
  as 
  in 
  

   the 
  north, 
  or 
  not; 
  but 
  from 
  the 
  available 
  facts 
  it 
  would 
  

   appear 
  that 
  part, 
  at 
  least, 
  on 
  reaching 
  the 
  south-western 
  

   extremity 
  turned 
  to 
  the 
  north 
  and 
  then 
  eastwards 
  along 
  the 
  

   coast. 
  On 
  the 
  1st 
  of 
  October 
  they 
  were 
  seen 
  flying 
  in 
  small 
  

   numbers 
  in 
  a 
  north-westerly 
  direction 
  across 
  the 
  sea 
  north 
  

   of 
  this 
  coast. 
  These 
  records 
  although 
  puzzhng 
  and 
  con- 
  

   tradictory 
  are 
  confirmed 
  by 
  several 
  observers, 
  and 
  also 
  by 
  

   a 
  record 
  of 
  a 
  previous 
  migration 
  in 
  the 
  same 
  district, 
  when 
  

   the 
  butterflies 
  flew 
  in 
  an 
  easterly 
  direction 
  for 
  several 
  

   days 
  (see 
  later). 
  During 
  the 
  whole 
  period 
  of 
  these 
  migra- 
  

   tions 
  across 
  the 
  northern 
  and 
  southern 
  parts 
  of 
  the 
  Island 
  

   the 
  east-central 
  portion 
  was 
  quite 
  free 
  of 
  any 
  unusual 
  

   flights. 
  

  

  Species 
  Kepresented. 
  

  

  It 
  has 
  been 
  mentioned 
  above 
  that 
  the 
  butterfly 
  which 
  was 
  

   mainly 
  responsible 
  for 
  this 
  migration 
  was 
  not 
  Callidryas 
  

   euhule, 
  which 
  has 
  many 
  times 
  been 
  recorded 
  as 
  migrating, 
  

   but 
  Catopsilia 
  statira, 
  a 
  less-known 
  species 
  differing 
  from 
  

   the 
  former 
  in 
  that 
  the 
  basal 
  portion 
  of 
  the 
  wings 
  of 
  the 
  

   male 
  are 
  of 
  a 
  more 
  intense 
  yellow 
  than 
  the 
  outer 
  portion. 
  

  

  This 
  butterfly 
  is, 
  as 
  a 
  rule, 
  not 
  so 
  common 
  in 
  Trinidad 
  

   as 
  Callidryas 
  euhule, 
  and 
  Sir 
  Norman 
  Lamont, 
  to 
  whom 
  I 
  am 
  

   indebted 
  for 
  the 
  identification, 
  had 
  previously 
  only 
  taken 
  

   it 
  on 
  a 
  few 
  occasions 
  in 
  the 
  southern 
  part 
  of 
  the 
  Island. 
  

   W. 
  J. 
  Kaye 
  in 
  his 
  Catalogue 
  of 
  the 
  Lepidoptera 
  Rhopalocera 
  

   of 
  Trinidad 
  (Trans. 
  Ent. 
  Soc. 
  1904, 
  p. 
  205) 
  says 
  that 
  it 
  is 
  

   locally 
  very 
  common 
  but 
  not 
  general. 
  W. 
  Potter, 
  a 
  young 
  

   local 
  naturalist, 
  says 
  that 
  he 
  sees 
  it 
  nearly 
  every 
  year, 
  and 
  

  

  