﻿SCALE 
  INSECTS 
  OF 
  IMPORTANCE 
  349 
  

  

  On 
  the 
  dorsal 
  side 
  the 
  anus 
  is 
  easily 
  detected. 
  The 
  dorsal 
  pores 
  are 
  

   small 
  and 
  clean-cut 
  and 
  usually 
  run 
  in 
  two 
  rows, 
  on 
  either 
  side 
  of 
  the 
  

   median 
  line, 
  one 
  from 
  the 
  second 
  incision 
  toward 
  the 
  lateral 
  transverse 
  

   chitinous 
  thickening 
  and 
  the 
  second 
  row 
  laterad 
  of 
  that 
  and 
  running 
  

   clear 
  to 
  the 
  outer 
  end 
  of 
  the 
  same 
  thickening, 
  one 
  pore 
  usually 
  being 
  

   against 
  the 
  thickening. 
  The 
  number 
  of 
  these 
  pores 
  is 
  variable 
  but 
  I 
  have 
  

   several 
  times 
  counted 
  six 
  or 
  eight 
  in 
  each 
  row. 
  At 
  the 
  first 
  incision 
  

   there 
  are 
  two 
  or 
  three 
  pores. 
  

  

  The 
  second 
  stage 
  of 
  A. 
  forbesi 
  (pi. 
  13, 
  fig. 
  i) 
  resembles 
  the 
  third 
  in 
  

   general, 
  though, 
  of 
  course, 
  it 
  is 
  smaller 
  in 
  size. 
  At 
  this 
  stage, 
  the 
  second 
  

   lobes 
  seem 
  somewhat 
  smaller 
  comparatively 
  and 
  are 
  more 
  often 
  rounded 
  

   than 
  notched. 
  The 
  characteristic 
  approximation 
  at 
  the 
  tips 
  usually 
  occurs, 
  

   and 
  aids 
  in 
  distinguishing 
  this 
  form 
  from 
  the 
  second 
  stage 
  of 
  A. 
  p 
  e 
  r- 
  

   n 
  i 
  c 
  i 
  o 
  s 
  u 
  s 
  which 
  usually 
  shows 
  nearly 
  parallel 
  lobes. 
  The 
  chitinous 
  

   processes 
  are 
  usually 
  of 
  the 
  characteristic 
  shape, 
  but 
  sometimes 
  are 
  not 
  

   so 
  marked 
  in 
  disparity 
  of 
  size 
  as 
  in 
  the 
  adult. 
  The 
  spines 
  and 
  plates 
  are 
  

   as 
  in 
  the 
  adult. 
  The 
  ventral 
  glands 
  are 
  of 
  course 
  wanting, 
  and 
  the 
  ventral 
  

   thickenings 
  are 
  faint 
  and 
  indefinite, 
  as 
  in 
  the 
  others 
  of 
  these 
  four 
  species. 
  

   The 
  dorsal 
  pores 
  are 
  fewer 
  than 
  in 
  the 
  adult 
  but 
  represent 
  in 
  scattering 
  

   lines 
  the 
  arrangement 
  of 
  the 
  later 
  stage. 
  Quite 
  often 
  one 
  may 
  be 
  

   observed 
  even 
  beyond 
  the 
  lateral 
  chitinous 
  thickenings. 
  

  

  Aspidiotus 
  perniciosus 
  Comst. 
  

  

  PLATES 
  12 
  AND 
  1 
  3, 
  FIGURES 
  2 
  

  

  The 
  adult 
  female 
  of 
  the 
  pernicious 
  or 
  San 
  Jose 
  scale 
  shows 
  two 
  distinct 
  

   pairs 
  of 
  lobes, 
  which, 
  wnile 
  approximating 
  somewhat 
  at 
  the 
  tip, 
  do 
  not 
  

   usually 
  come 
  so 
  close 
  together 
  as 
  in 
  A. 
  f 
  o 
  r 
  b 
  e 
  s 
  i. 
  The 
  median 
  lobes 
  are 
  

   rather 
  long 
  and 
  narrow 
  in 
  appearance, 
  are 
  deeply 
  notched 
  on 
  the 
  outer 
  

   margin 
  and 
  often 
  on 
  the 
  inner 
  margin 
  nearer 
  the 
  tip 
  than 
  is 
  the 
  outer 
  

   notch. 
  The 
  second 
  lobes 
  are 
  distinct, 
  well 
  marked, 
  about 
  half 
  the 
  size 
  

   of 
  the 
  first, 
  rounded 
  at 
  the 
  tips 
  and 
  notched 
  on 
  the 
  outer 
  margin. 
  The 
  

   spines 
  are 
  as 
  in 
  allied 
  species, 
  one 
  on 
  each 
  lobe, 
  one 
  beyond 
  the 
  second 
  

   incision 
  and 
  the 
  fourth 
  about 
  halfway 
  from 
  the 
  lobes 
  to 
  the 
  penulti- 
  

   mate 
  segment. 
  The 
  plates 
  are 
  quite 
  numerous 
  and 
  easily 
  distinguishable, 
  

   giving 
  a 
  somewhat 
  fringed 
  appearance 
  that 
  helps 
  to 
  differentiate 
  this 
  

   species 
  from 
  A. 
  forbesi. 
  There 
  are 
  usually 
  two 
  inconspicuous 
  plates 
  

   between 
  the 
  median 
  lobes, 
  and 
  two 
  or 
  three 
  long 
  and 
  slender 
  ones 
  at 
  the 
  

   first 
  incision, 
  three 
  or 
  two 
  often 
  somewhat 
  serrate 
  ones 
  at 
  the 
  second 
  

   incision 
  and 
  three 
  broad, 
  often 
  two-pointed 
  ones, 
  between 
  the 
  third 
  and 
  

  

  