﻿238 
  THE 
  ZOOLOGIST. 
  

  

  first 
  formed 
  ; 
  he 
  then 
  went, 
  half-way 
  around 
  the 
  circle, 
  and 
  started 
  off 
  

   in 
  another 
  direction, 
  the 
  others 
  following. 
  

  

  "From 
  the 
  above 
  it 
  will 
  be 
  seen 
  that 
  the 
  removal 
  of 
  the 
  leader 
  

   affects 
  the 
  whole 
  line, 
  but 
  that 
  he 
  is 
  not 
  necessary 
  for 
  the 
  further 
  pro- 
  

   gression 
  of 
  the 
  caterpillars. 
  I 
  have 
  been 
  unable 
  to 
  find 
  references 
  to 
  

   the 
  procession-caterpillar, 
  but 
  notice 
  that 
  the 
  caterpillars 
  of 
  Satumia 
  

   vr- 
  march, 
  when 
  young, 
  the 
  same 
  as 
  the 
  Maia-moth. 
  

  

  " 
  Dubois} 
  notes 
  that 
  the 
  procession-caterpillar 
  spins 
  a 
  thread 
  which 
  

   the 
  others 
  in 
  the 
  line 
  follow 
  ; 
  the 
  young 
  larva? 
  of 
  Hemileuca 
  do 
  the 
  

   same, 
  the 
  thread 
  being 
  seen, 
  with 
  a 
  hand 
  lens, 
  back 
  of 
  the 
  line. 
  In 
  

   nearly 
  all 
  the 
  long 
  lines 
  which 
  the 
  larva? 
  form, 
  there 
  is 
  very 
  apt 
  to 
  be 
  

   at 
  least 
  one 
  break 
  where 
  there 
  is 
  an 
  inch 
  or 
  more 
  between 
  the 
  nearest 
  

   caterpillars, 
  or 
  such 
  a 
  break 
  can 
  be 
  made 
  by 
  stopping 
  one 
  of 
  the 
  larva? 
  

   until 
  the 
  preceding 
  ones 
  have 
  gone 
  ahead 
  for 
  same 
  distance 
  ; 
  at 
  such 
  a 
  

   place 
  the 
  thread 
  also 
  can 
  be 
  seen. 
  When 
  a 
  break 
  occurs, 
  it 
  does 
  not 
  

   in 
  any 
  way 
  affect 
  the 
  movements 
  of 
  the 
  line, 
  the 
  caterpillars 
  following 
  

   along 
  the 
  regular 
  path. 
  

  

  " 
  Wishing 
  to 
  see 
  how 
  much 
  the 
  caterpillars 
  depended 
  upon 
  this 
  

   thread 
  to 
  enable 
  them 
  to 
  follow 
  in 
  the 
  exact 
  path 
  of 
  the 
  leader, 
  I 
  

   removed 
  the 
  thread 
  a 
  number 
  of 
  times 
  when 
  the 
  distance 
  between 
  two 
  

   neighbouring 
  caterpillars 
  was 
  great 
  enough, 
  and 
  found 
  that 
  the 
  course 
  

   was 
  not 
  in 
  the 
  least 
  altered. 
  The 
  caterpillars, 
  upon 
  reaching 
  the 
  end 
  

   of 
  the 
  broken 
  thread, 
  generally 
  kept 
  straight 
  on 
  as 
  if 
  nothing 
  had 
  

   been 
  done, 
  failing 
  to 
  show 
  a 
  dependence 
  upon 
  the 
  thread 
  alone 
  in 
  

   following 
  the 
  path 
  of 
  those 
  ahead. 
  I 
  next 
  removed 
  the 
  thread, 
  and 
  

   then, 
  dipping 
  a 
  finger 
  in 
  water, 
  rubbed 
  it 
  rapidly 
  a 
  number 
  of 
  times 
  

   across 
  the 
  path, 
  and 
  then 
  wiped 
  the 
  place 
  dry. 
  When 
  the 
  first 
  cater- 
  

   pillar 
  reached 
  this 
  spot 
  he 
  halted, 
  and 
  for 
  three 
  minutes 
  remained 
  at 
  

   the 
  same 
  place, 
  raising 
  the 
  anterior 
  part 
  of 
  the 
  body 
  in 
  the 
  air, 
  acting 
  

   the 
  same 
  as 
  if 
  the 
  leader 
  had 
  been 
  removed. 
  At 
  the 
  end 
  of 
  this 
  time 
  he 
  

   started 
  forward, 
  following, 
  as 
  near 
  as 
  I 
  could 
  judge, 
  the 
  original 
  path. 
  

  

  " 
  The 
  following 
  few 
  experiments 
  should 
  have 
  been 
  made 
  with 
  the 
  

   food- 
  plant 
  of 
  the 
  caterpillar, 
  but 
  this 
  being 
  unobtainable 
  at 
  the 
  time 
  

   of 
  the 
  year 
  when 
  the 
  caterpillars 
  were 
  hatching 
  in 
  my 
  room, 
  the 
  leaf 
  

   of 
  the 
  geranium 
  {Pelargonium), 
  which 
  was 
  easily 
  obtained 
  and 
  possessed 
  

   quite 
  an 
  odour, 
  was 
  used. 
  

  

  " 
  1. 
  A 
  small 
  piece 
  of 
  the 
  leaf 
  was 
  placed 
  5 
  mm. 
  away 
  from 
  a 
  small 
  

   group 
  which 
  had 
  been 
  quiet 
  for 
  two 
  or 
  three 
  hours 
  ; 
  the 
  caterpillars 
  

   became 
  at 
  once 
  restless, 
  and 
  in 
  two 
  minutes 
  three 
  had 
  moved 
  over 
  and 
  

   touched 
  the 
  leaf. 
  

  

  :;: 
  Dickerson, 
  Mary 
  C, 
  ' 
  Moths 
  and 
  Butterflies,' 
  1901. 
  

   I 
  Dubois, 
  'Ann. 
  Soc. 
  Linn. 
  Lyon.' 
  xlxi. 
  1900, 
  p. 
  125. 
  

  

  