﻿208 
  Transactions. 
  — 
  Zoology. 
  

  

  either 
  to 
  create 
  a 
  new 
  subsection, 
  or 
  to 
  attach 
  so 
  much 
  elasticity 
  to 
  the 
  

   existing 
  classification 
  as 
  to 
  allow 
  these 
  species 
  to 
  belong 
  to 
  the 
  Lecanio- 
  

   diaspid(B. 
  I 
  am 
  loth 
  to 
  take 
  the 
  former 
  course, 
  because 
  in 
  their 
  other 
  

   characters 
  they 
  present 
  little 
  difficulty 
  ; 
  moreover, 
  the 
  context 
  of 
  the 
  

   expression 
  quoted 
  above 
  is 
  not 
  enthely 
  free 
  from 
  doubt. 
  I 
  shall 
  therefore 
  

   proceed 
  upon 
  the 
  second 
  course. 
  

  

  I 
  have 
  already 
  said 
  that 
  the 
  insects 
  in 
  this 
  subsection 
  combine 
  the 
  

   mentum 
  and 
  lobes 
  of 
  Lecanium 
  with 
  a 
  test 
  or 
  carapace 
  as 
  in 
  the 
  Diaspid®. 
  

   In 
  the 
  species 
  before 
  me 
  this 
  test 
  is 
  whitish, 
  glassy, 
  and 
  transparent 
  in 
  the 
  

   earlier 
  stages, 
  often 
  waxy 
  on 
  the 
  old 
  insects. 
  A 
  fringe 
  mtire 
  or 
  less 
  broad, 
  

   and 
  divided 
  into 
  segments 
  more 
  or 
  less 
  large, 
  is 
  seen 
  in 
  most*sj)ecies 
  ; 
  and 
  

   the 
  old 
  female, 
  after 
  having 
  produced 
  her 
  young, 
  is 
  generally 
  found 
  

   shrivelled 
  up 
  at 
  the 
  cephalic 
  end 
  of 
  the 
  test. 
  

  

  Spinnerets 
  are 
  not 
  to 
  be 
  made 
  out 
  in 
  the 
  earlier 
  stages, 
  but 
  when 
  the 
  

   insect 
  is 
  fully 
  grown 
  there 
  may 
  be 
  seen, 
  all 
  round 
  the 
  edge 
  of 
  the 
  body, 
  a 
  

   row 
  of 
  numerous 
  circular 
  openings, 
  and, 
  especially 
  in 
  Ctenochiton 
  viridis, 
  

   other 
  rows 
  of 
  minute 
  oval 
  marks 
  disposed 
  along 
  the 
  borders 
  of 
  scales 
  like 
  

   those 
  of 
  a 
  tortoise. 
  I 
  imagine 
  that 
  these 
  marks 
  are 
  the 
  spinnerets. 
  

  

  In 
  this 
  subsection 
  I 
  have 
  two 
  genera, 
  both 
  of 
  which 
  I 
  beheve 
  to 
  be 
  new. 
  

   Ctenochiton, 
  gen. 
  nov. 
  

  

  Four 
  genera 
  are 
  included 
  by 
  Signoret 
  in 
  the 
  subsection 
  Lecanio- 
  

   diaspidee 
  : 
  — 
  

  

  1st, 
  PolUnia, 
  in 
  which 
  the 
  test 
  is 
  globular, 
  and 
  the 
  young 
  insect 
  pre- 
  

   sents, 
  instead 
  of 
  the 
  abdominal 
  lobes 
  of 
  Lecanium, 
  the 
  anal 
  tubercles 
  of 
  

   Coccus. 
  

  

  2nd, 
  Asterolecanium, 
  in 
  which 
  the 
  fringe 
  is 
  double, 
  and 
  the 
  females 
  in 
  

   most 
  cases 
  apodous. 
  

  

  3rd, 
  PlancJionia, 
  in 
  which 
  the 
  test 
  is 
  felted, 
  the 
  adult 
  female 
  without 
  

   feet 
  or 
  antennae. 
  

  

  4th, 
  Lecanio-diaspis 
  in 
  which 
  the 
  test 
  is 
  also 
  fel^jed, 
  but 
  the 
  female 
  

   retains 
  her 
  antennae 
  , 
  

  

  It 
  will 
  be 
  seen 
  that 
  my 
  genus 
  Ctenochiton 
  does 
  not 
  agree 
  with 
  any 
  of 
  

   these. 
  The 
  young 
  insect 
  has 
  the 
  abdominal 
  lobes 
  ; 
  the 
  test 
  is 
  glassy 
  and 
  

   transparent, 
  becoming 
  waxy 
  at 
  a 
  later 
  period 
  and, 
  in 
  one 
  species, 
  felted 
  at 
  

   the 
  latest 
  stage 
  ; 
  the 
  females 
  preserve 
  theh 
  feet 
  and 
  antennae 
  at 
  least 
  until 
  

   after 
  producing 
  the 
  young. 
  

  

  6. 
  Ctenochiton 
  perforatus, 
  sp. 
  nov. 
  

  

  Plate 
  VII., 
  figs. 
  13, 
  14. 
  

  

  This 
  species 
  is 
  very 
  common 
  upon 
  native 
  trees 
  and 
  shrubs 
  near 
  

   Christchurch. 
  Pittosporum, 
  Drimys, 
  Coprosma, 
  Rubus, 
  Panax 
  and 
  many 
  

   others 
  are 
  attacked 
  by 
  it, 
  sometimes 
  so 
  much 
  so 
  that 
  the 
  underside 
  of 
  the 
  

   leaves 
  is 
  scarcely 
  to 
  be 
  seen 
  for 
  the 
  number 
  of 
  insects 
  covering 
  -them. 
  

  

  