﻿-158- 
  

  

  The 
  perfect 
  insects 
  of 
  these 
  species 
  are 
  very 
  well-known 
  thick-bod- 
  

   ied 
  moths, 
  that 
  of 
  the 
  yellow 
  bear 
  being 
  the 
  one 
  to 
  which 
  the 
  common 
  

   name 
  of 
  "miller" 
  is 
  most 
  likely 
  to 
  be 
  attached. 
  Its 
  heavily-coated 
  

   wings 
  are 
  snowy 
  white 
  with 
  a 
  few 
  black 
  dots, 
  and 
  the 
  abdomen 
  orange, 
  

   with 
  three 
  rows 
  of 
  black 
  spots 
  above. 
  The 
  adult 
  of 
  the 
  hedge-hog 
  cat- 
  

   erpillar 
  is 
  the 
  Isabella 
  moth, 
  orange-buff 
  on 
  wings 
  and 
  body, 
  with 
  the 
  

   hind 
  wings 
  tinted 
  more 
  or 
  less 
  with 
  rose. 
  The 
  wings 
  are 
  also 
  speckled 
  

  

  with 
  black, 
  and 
  black 
  dots 
  are 
  

   arranged 
  on 
  the 
  upper 
  surface 
  

   of 
  the 
  abdomen 
  in 
  three 
  longi- 
  

   tudinal 
  rows. 
  The 
  moth 
  of 
  the 
  

   salt-marsh 
  caterpillar 
  has 
  the 
  

   abdomen 
  orange, 
  and 
  all 
  the 
  

   wings 
  white 
  in 
  the 
  female, 
  the 
  

   male 
  differing 
  by 
  the 
  orange 
  

   hinder 
  wings. 
  In 
  both 
  sexes 
  

   the 
  wings 
  are 
  thickly 
  speckled 
  

   with 
  black, 
  and 
  the 
  abdomen 
  

   with 
  black 
  in 
  three 
  longitudinal 
  

   rows. 
  All 
  three 
  of 
  the 
  species 
  

   seem 
  to 
  be 
  normally 
  two- 
  

   brooded. 
  The 
  larvae 
  of 
  the 
  first 
  

   brood 
  are 
  commonest 
  in 
  June 
  

   and 
  July, 
  and 
  those 
  of 
  the 
  sec- 
  

   ond 
  brood 
  in 
  September. 
  The 
  woolly 
  bears 
  are 
  frequently 
  beset 
  by 
  

   hymenopterous 
  parasites, 
  and 
  the 
  hedge-hog 
  caterpillar 
  seems 
  especially 
  

   subject 
  to 
  death 
  by 
  muscardine 
  — 
  due 
  to 
  the 
  attacks 
  of 
  a 
  parasitic 
  fungus 
  

   which 
  converts 
  the 
  body 
  soon 
  after 
  death 
  into 
  a 
  rigid 
  mummy, 
  scarcely 
  

   shrunken 
  from 
  the 
  proportions 
  of 
  the 
  living 
  insect. 
  

  

  Fig. 
  86. 
  The 
  Hedge-hog 
  Caterpillar, 
  Fyrrliarctiu 
  

   Jsahella: 
  a, 
  larva; 
  b, 
  pupa 
  in 
  cocoon; 
  c, 
  adult. 
  

  

  Injuries 
  to 
  the 
  roots. 
  

  

  In 
  case 
  an 
  unthrifty 
  condition 
  of 
  the 
  beet 
  plant 
  is 
  not 
  fully 
  ex- 
  

   plained 
  by 
  injuries 
  to 
  the 
  foliage, 
  an 
  examination 
  of 
  the 
  roots 
  will 
  often 
  

   betray 
  the 
  presence 
  there 
  of 
  insects 
  doing 
  an 
  injury 
  sufficient 
  to 
  diminish 
  

   the 
  general 
  vigor 
  of 
  the 
  plant, 
  or 
  which 
  may 
  result 
  in 
  its 
  destruction. 
  

   There 
  are 
  two 
  classes 
  of 
  injury 
  to 
  the 
  roots 
  of 
  beets 
  by 
  insects; 
  those 
  

   resulting 
  from 
  a 
  sucking 
  of 
  the 
  sap 
  from 
  the 
  tissue 
  of 
  the 
  root 
  by 
  true 
  

   bugs 
  iyHemiptera); 
  and 
  those 
  due 
  to 
  beetles 
  and 
  their 
  larvae, 
  which 
  gnaw 
  

   the 
  surface 
  of 
  the 
  root 
  or 
  eat 
  into 
  its 
  substance. 
  Injuries 
  by 
  the 
  sucto- 
  

   rial 
  Heiniptera 
  are 
  distinctly 
  recognizable 
  only 
  when 
  the 
  insects 
  them- 
  

   selves 
  are 
  found 
  on 
  the 
  root, 
  since 
  the 
  local 
  effect 
  of 
  the 
  abstraction 
  of 
  

   "the 
  sap 
  is 
  not 
  usually 
  very 
  marked. 
  The 
  insects 
  of 
  this 
  description 
  thus 
  

  

  