﻿78 
  Mr. 
  C. 
  B. 
  WilUams 
  on 
  

  

  average 
  person 
  who 
  is 
  on 
  the 
  look 
  out; 
  most 
  obvious 
  in 
  

   large 
  open 
  spaces. 
  

  

  (3) 
  Arrow 
  with 
  three 
  heads 
  : 
  Distinct 
  migration 
  anything 
  

   from 
  ten 
  to 
  two 
  or 
  three 
  hundred 
  per 
  minute 
  crossing 
  a 
  

   hundred 
  yards 
  hne 
  — 
  obvious 
  to 
  any 
  ordinary 
  person. 
  

   Probably 
  recorded 
  by 
  a 
  naturalist. 
  

  

  (4) 
  Arrow 
  with 
  four 
  heads 
  : 
  Thick 
  clouds 
  of 
  butterflies 
  — 
  

   thousands 
  in 
  a 
  small 
  space 
  — 
  " 
  several 
  with 
  one 
  sweep 
  

   of 
  the 
  net 
  " 
  — 
  " 
  like 
  snow 
  storm 
  " 
  — 
  " 
  motor-cars 
  held 
  up 
  " 
  

   — 
  gets 
  into 
  the 
  local 
  newspapers. 
  

  

  (5) 
  The 
  series 
  of 
  crosses 
  with 
  one, 
  two, 
  three 
  and 
  four 
  

   bars 
  represents 
  the 
  same 
  scale 
  of 
  abundance 
  as 
  the 
  arrows, 
  

   but 
  denotes 
  that 
  the 
  insects 
  were 
  at 
  rest 
  or 
  fluttering 
  

   round 
  and 
  not 
  moving 
  regularly 
  in 
  one 
  direction. 
  

  

  (6) 
  The 
  circle 
  indicates 
  that 
  no 
  butterflies 
  were 
  seen 
  

   either 
  moving 
  or 
  at 
  rest 
  by 
  a 
  reUable 
  observer. 
  

  

  (7) 
  Circle 
  with 
  enclosed 
  cross 
  indicates 
  that 
  the 
  butter- 
  

   flies, 
  if 
  present, 
  were 
  not 
  in 
  sufficient 
  numbers 
  to 
  attract 
  

   attention. 
  They 
  are 
  used 
  chiefly 
  in 
  the 
  case 
  of 
  non- 
  

   entomological 
  correspondents 
  reporting 
  that 
  nothing 
  

   unusual 
  was 
  happening 
  in 
  their 
  district. 
  

  

  It 
  must 
  be 
  absolutely 
  understood 
  that 
  the 
  blank 
  on 
  

   the 
  maps 
  does 
  not 
  indicate 
  an 
  absence 
  of 
  butterflies, 
  but 
  

   merely 
  an 
  absence 
  of 
  records. 
  

  

  These 
  signs 
  have 
  been 
  found 
  so 
  convenient 
  in 
  the 
  present 
  

   case 
  that 
  it 
  is 
  hoped 
  that 
  future 
  observers 
  will 
  adopt 
  some 
  

   similar 
  method 
  of 
  expressing 
  their 
  results. 
  

  

  The 
  Migration. 
  

  

  Following 
  the 
  series 
  of 
  maps 
  on 
  Plates 
  VI-IX 
  the 
  course 
  

   of 
  migration 
  will 
  be 
  seen 
  as 
  follows 
  : 
  — 
  

  

  At 
  the 
  end 
  of 
  August 
  the 
  butterflies 
  were 
  reported 
  in 
  

   large 
  numbers 
  setthng 
  on 
  the 
  roads 
  in 
  the 
  south-eastern 
  

   part 
  of 
  the 
  Island. 
  Between 
  this 
  date 
  and 
  the 
  third 
  week 
  

   in 
  September 
  no 
  records 
  were 
  obtained 
  except 
  that 
  on 
  the 
  

   10th 
  September 
  a 
  correspondent 
  drove 
  through 
  part 
  of 
  the 
  

   district 
  and 
  saw 
  nothing 
  unusual. 
  

  

  On 
  the 
  19th 
  and 
  20th 
  September 
  they 
  are 
  reported 
  in 
  

   numbers 
  at 
  rest 
  and 
  fluttering 
  round 
  in 
  the 
  north-eastern 
  

   district, 
  and 
  the 
  following 
  day 
  they 
  are 
  again 
  abundant 
  in 
  

   the 
  south-east 
  (when 
  a 
  few 
  were 
  doubtfully 
  moving 
  north- 
  

   ward). 
  They 
  had 
  on 
  this 
  day 
  started 
  to 
  move 
  across 
  the 
  

   northern 
  half 
  of 
  the 
  Island 
  at 
  the 
  southern 
  edge 
  of 
  the 
  

   northern 
  range. 
  

  

  