﻿222 
  Transactions. 
  — 
  Zoology. 
  

  

  The 
  spinnerets 
  are 
  not 
  arranged 
  in 
  rows, 
  but 
  scattered 
  in 
  great 
  nurobers 
  

   over 
  the 
  whole 
  body. 
  The 
  vast 
  majority 
  of 
  them 
  are 
  small 
  and 
  circular, 
  

   but 
  round 
  the 
  edge 
  of 
  the 
  body, 
  amongst 
  the 
  tufts 
  of 
  hairs, 
  runs 
  a 
  row 
  of 
  

   others 
  much 
  larger. 
  These 
  protrude 
  some 
  distance 
  from 
  the 
  body 
  ; 
  their 
  

   lower 
  end 
  being 
  brown, 
  with 
  a 
  sort 
  of 
  crown 
  encircling 
  it, 
  from 
  which 
  

   springs 
  a 
  long 
  glassy 
  tube. 
  Some 
  of 
  these 
  spinnerets 
  and 
  a 
  tuft 
  of 
  hairs 
  

   are 
  shown 
  in 
  fig. 
  206-. 
  

  

  The 
  feet 
  and 
  digitules, 
  fig. 
  20e, 
  resemble 
  those 
  of 
  the 
  young 
  insect, 
  but 
  

   the 
  antennae 
  have 
  now 
  nine 
  joints, 
  all 
  nearly 
  equal, 
  the 
  last 
  joint 
  smaller, 
  

   comparatively, 
  than 
  in 
  the 
  young 
  ; 
  the 
  hairs 
  of 
  the 
  antennse 
  are 
  also 
  

   shorter. 
  

  

  In 
  its 
  third 
  stage 
  (fig. 
  21), 
  the 
  insect 
  acquires 
  its 
  very 
  peculiar 
  appearance 
  

   and 
  afterwards 
  changes 
  no 
  more. 
  The 
  feet 
  are 
  much 
  the 
  same 
  as 
  before 
  ; 
  the 
  

   antennse 
  have 
  now 
  eleven 
  joints, 
  tapering 
  slightly 
  to 
  the 
  tip, 
  and 
  all 
  some- 
  

   what 
  more 
  hairy 
  than 
  in 
  the 
  last 
  stage; 
  fig. 
  20rf. 
  The 
  tufts 
  of 
  hairs 
  are 
  still 
  

   at 
  the 
  edge; 
  the 
  spinnerets 
  are 
  still 
  more 
  numerous 
  than 
  in 
  the 
  earlier 
  

   stages. 
  

  

  The 
  general 
  colour 
  of 
  the 
  insect 
  is 
  now 
  a 
  rusty 
  brown, 
  but 
  it 
  is 
  so 
  

   covered 
  with 
  cottony 
  down 
  as 
  to 
  seem, 
  in 
  the 
  latest 
  period, 
  nearly 
  white. 
  

   All 
  round 
  the 
  edge, 
  especially 
  at 
  the 
  abdominal 
  end, 
  runs 
  a 
  row 
  of 
  black 
  

   marks 
  (the 
  tufts 
  of 
  hair 
  spoken 
  of 
  above), 
  and 
  just 
  within 
  it 
  a 
  fainter 
  line. 
  

   At 
  the 
  commencement 
  of 
  this 
  stage 
  the 
  insect 
  lies 
  flat 
  on 
  the 
  leaf 
  or 
  twig, 
  

   but 
  its 
  edge 
  is 
  slightly 
  raised 
  all 
  round, 
  whilst 
  along 
  the 
  middle 
  of 
  the 
  upper 
  

   side 
  of 
  the 
  thoracic 
  portion 
  is 
  a 
  raised 
  hump, 
  or 
  rather 
  a 
  prominence 
  

   divided 
  into 
  three 
  humps. 
  A 
  white 
  meal 
  covers 
  the 
  back, 
  and 
  all 
  round 
  the 
  

   edge 
  is 
  seen 
  a 
  narrow 
  ring 
  of 
  white 
  felted 
  cotton. 
  This 
  is 
  the 
  commence- 
  

   ment 
  of 
  the 
  large 
  ovisac 
  or 
  nest, 
  in 
  which 
  the 
  young 
  insects 
  are 
  enveloped. 
  

  

  Later 
  on 
  the 
  female 
  begins 
  to 
  procreate. 
  The 
  body 
  becomes 
  full 
  of 
  eggs, 
  

   and 
  these 
  are 
  ejected 
  into 
  the 
  ovisac, 
  which 
  is 
  gradually 
  becoming 
  larger. 
  

   The 
  insect 
  now 
  begins 
  to 
  be 
  raised 
  up 
  ; 
  the 
  cephaUc 
  end 
  still 
  remains 
  

   attached 
  to 
  the 
  plant, 
  but 
  the 
  abdominal 
  end 
  is 
  elevated, 
  and 
  the 
  space 
  left 
  

   is 
  filled 
  with 
  the 
  cottony 
  down 
  of 
  the 
  ovisac. 
  At 
  the 
  same 
  time, 
  white 
  

   cottony 
  processes 
  form 
  at 
  the 
  edge 
  of 
  the 
  thorax, 
  over 
  the 
  feet, 
  looking, 
  in 
  

   fact, 
  to 
  the 
  naked 
  eye, 
  as 
  if 
  they 
  were 
  actually 
  attached 
  to 
  the 
  legs. 
  Long, 
  

   fine, 
  translucent 
  white 
  hairs 
  or 
  spines 
  radiate 
  from 
  the 
  body 
  in 
  every 
  

   direction. 
  The 
  general 
  colour 
  of 
  the 
  insect 
  is 
  still 
  brown, 
  powdered 
  with 
  

   white. 
  

  

  The 
  female 
  at 
  length 
  reaches 
  her 
  full 
  development. 
  Now 
  the 
  abdominal 
  

   end 
  is 
  still 
  more 
  raised, 
  so 
  that 
  the 
  insect 
  has 
  the 
  appearance 
  of 
  standing 
  on 
  

   its 
  head. 
  The 
  ovisac 
  attains 
  its 
  full 
  size, 
  and 
  extends 
  for 
  some 
  distance 
  

   behind 
  the 
  body, 
  filling 
  also 
  the 
  space 
  between 
  it 
  and 
  the 
  plant, 
  as 
  shown 
  

  

  