﻿DISTANCE 
  FIRST-STAGE 
  LARV^ 
  CAN 
  CRAWL, 
  

  

  29 
  

  

  seek 
  places 
  which 
  are 
  protected 
  from 
  the 
  sun, 
  and 
  in 
  such 
  situations 
  

   pupation 
  takes 
  place. 
  The 
  egg 
  masses 
  are 
  deposited 
  near 
  the 
  cases 
  

   from 
  which 
  the 
  females 
  emerged. 
  Hence 
  it 
  is 
  seldom 
  possible 
  to 
  

   find 
  egg 
  clusters 
  on 
  the 
  upper 
  sides 
  of 
  the 
  branches 
  or 
  twigs 
  of 
  trees, 
  

   because 
  the 
  lower 
  sides 
  furnish 
  more 
  protection 
  and 
  they 
  are 
  sought 
  

   by 
  the 
  caterpillars 
  before 
  pupating. 
  For 
  this 
  same 
  reason 
  it 
  is 
  

   usually 
  possible 
  to 
  find 
  many 
  egg 
  clusters 
  on 
  tree 
  trunks 
  just 
  above 
  

   the 
  ground 
  (PI. 
  XL 
  fig. 
  1), 
  especially 
  if 
  there 
  is 
  grass 
  or 
  other 
  mate- 
  

   rial 
  which 
  would 
  furnish 
  protection. 
  Many 
  larva3, 
  however, 
  crawl 
  

   from 
  the 
  trees 
  and 
  seek 
  secluded 
  places, 
  sometimes 
  at 
  a 
  considerable 
  

   distance 
  from 
  their 
  food 
  plants, 
  and 
  rubbish 
  piles, 
  stone 
  walls 
  (PI. 
  

   XL 
  fig. 
  2), 
  lumber 
  piles 
  (PI. 
  Ill), 
  outbuildings, 
  or 
  other 
  protected 
  

   places 
  are 
  often 
  found 
  

   badlv 
  infested 
  with 
  

  

  egg 
  clusters. 
  

  

  The 
  larva 
  1 
  which 
  

   hatch 
  in 
  such 
  situa- 
  

   tions 
  must 
  of 
  necessity 
  

   find 
  suitable 
  food 
  if 
  

   they 
  are 
  to 
  survive, 
  

   and 
  the 
  more 
  traveling 
  

   it 
  is 
  necessary 
  for 
  them 
  

   to 
  do 
  to 
  accomplish 
  this 
  

   purpose 
  t 
  h 
  e 
  greater 
  

   chance 
  there 
  is 
  that 
  

   dispersion 
  by 
  the 
  wind 
  _ 
  _ 
  . 
  . 
  . 
  . 
  . 
  

  

  1 
  J 
  Pig. 
  2. 
  — 
  Female 
  pupal 
  case 
  and 
  egg 
  clusters 
  of 
  jripsy 
  

  

  Will 
  take 
  place. 
  For 
  moth 
  on 
  stone 
  foundation 
  under 
  woodwork 
  of 
  house 
  

  

  Arrows 
  A 
  indicate 
  location 
  of 
  egg 
  clusters 
  ; 
  arrow 
  7? 
  

  

  instance, 
  egff 
  clusters 
  

  

  indicates 
  location 
  of 
  pupal 
  case. 
  (Original.) 
  

  

  are 
  frequently 
  depos- 
  

   ited 
  beneath 
  porches 
  or 
  on 
  the 
  underpinning 
  of 
  houses 
  (fig. 
  2), 
  where 
  

   it 
  is 
  impossible 
  to 
  destroy 
  them 
  without 
  first 
  removing 
  a 
  part 
  of 
  the 
  

   building. 
  After 
  hatching 
  takes 
  place 
  the 
  larva? 
  can 
  commonly 
  be 
  

   found 
  wandering 
  about 
  in 
  search 
  of 
  food* 
  They 
  often 
  crawl 
  to 
  the 
  

   roofs 
  of 
  the 
  buildings, 
  and 
  if 
  they 
  spin 
  down 
  from 
  such 
  a 
  location, 
  

   which 
  often 
  happens, 
  there 
  is 
  ample 
  opportunity 
  for 
  dispersion 
  b} 
  T 
  

   the 
  wind. 
  

  

  As 
  a 
  rule 
  the 
  location 
  of 
  the 
  egg 
  clusters 
  and 
  the 
  distance 
  that 
  the 
  

   larvae 
  have 
  to 
  travel 
  for 
  food 
  are 
  important 
  factors, 
  because 
  hunger 
  

   causes 
  them 
  to 
  search 
  for 
  food, 
  and 
  activity 
  is 
  essential 
  to 
  dispersion. 
  

  

  DISTANCE 
  FIRST-STAGE 
  LARV^ 
  CAN 
  CRAWL. 
  

  

  It 
  is 
  important 
  to 
  know 
  how 
  far 
  first-stage 
  larva- 
  can 
  crawl, 
  as 
  

   upon 
  this 
  factor 
  depends 
  the 
  chance 
  for 
  the 
  establishment 
  of 
  many 
  

   new 
  colonies. 
  Experiments 
  reported 
  by 
  Forbush 
  and 
  Fernald 
  show 
  

   that 
  newly 
  hatched 
  larvae 
  have 
  crawled 
  from 
  36 
  to 
  111 
  feet 
  before 
  

  

  