﻿354 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  deep. 
  The 
  plates 
  and 
  spines 
  are 
  as 
  in 
  the 
  adult; 
  the 
  chitinous 
  processes 
  

   are 
  subequal 
  and 
  similar 
  to 
  those 
  in 
  the 
  adult 
  though 
  of 
  course 
  smaller; 
  

   the 
  ventral 
  glands 
  wanting, 
  ventral 
  thickenings 
  parenthesis-shaped 
  ; 
  

   anus 
  and 
  transverse 
  thickenings 
  as 
  in 
  the 
  adult. 
  The 
  dorsal 
  pores 
  are 
  

   fewer 
  than 
  in 
  the 
  adult 
  but 
  are 
  plainly 
  of 
  the 
  same 
  general 
  arrangement, 
  

   with 
  two 
  or 
  three 
  at 
  the 
  first 
  incision, 
  a 
  row 
  from 
  the 
  second 
  incision 
  

   consisting 
  usually 
  of 
  three 
  pores 
  and 
  the 
  lateral 
  row 
  with 
  about 
  six 
  

   running 
  up 
  to 
  the 
  lateral 
  transverse 
  thickening. 
  There 
  are 
  usually 
  one 
  

   or 
  two 
  pores 
  still 
  laterad 
  of 
  this 
  and 
  generally 
  two 
  or 
  more 
  to 
  represent 
  

   the 
  basal 
  angle 
  group. 
  This 
  is 
  closely 
  similar 
  to 
  the 
  second 
  stage 
  of 
  

   A. 
  a 
  n 
  c 
  y 
  1 
  u 
  s, 
  but 
  may 
  be 
  distinguished 
  in 
  carefully 
  prepared 
  specimens 
  

   by 
  the 
  absence 
  of 
  the 
  fringing 
  plates 
  which 
  characterize 
  the 
  latter. 
  

   Usually 
  the 
  difference 
  in 
  the 
  general 
  shape 
  of 
  the 
  lobes 
  and 
  the 
  deeper, 
  

   narrower 
  incisions 
  of 
  A. 
  perniciosus 
  and 
  A. 
  f 
  o 
  r 
  b 
  e 
  s 
  i 
  will 
  dis- 
  

   tinguish 
  the 
  second 
  stages 
  of 
  these 
  two 
  species 
  from 
  those 
  of 
  A. 
  

   ostreaeformis 
  to 
  one 
  at 
  all 
  familiar 
  with 
  these 
  forms. 
  

  

  SCALE 
  INSECTS, 
  COCCIDAE, 
  IN 
  NEW 
  YORK 
  STATE 
  

  

  This 
  list 
  of 
  78 
  species 
  gives 
  some 
  idea 
  of 
  the 
  number 
  of 
  scale 
  insects 
  

   farmers, 
  horticulturists, 
  nurserymen 
  and 
  those 
  interested 
  in 
  greenhouses 
  

   have 
  to 
  contend 
  with. 
  It 
  also 
  has 
  value 
  in 
  that 
  it 
  indicates 
  about 
  what 
  

   forms 
  may 
  be 
  found 
  on 
  certain 
  plants 
  in 
  the 
  state, 
  though 
  the 
  list 
  of 
  food 
  

   plants 
  of 
  a 
  number 
  of 
  species 
  could 
  undoubtedly 
  be 
  considerably 
  

   increased 
  by 
  farther 
  collecting. 
  Those 
  occurring 
  on 
  any 
  one 
  plant 
  can 
  

   easily 
  be 
  ascertained 
  by 
  referring 
  to 
  the 
  index, 
  where 
  the 
  species 
  are 
  

   listed 
  under 
  the 
  names 
  of 
  the 
  plants 
  on 
  which 
  they 
  may 
  be 
  found. 
  

   Many 
  of 
  these 
  scale 
  insects 
  are 
  not 
  injurious, 
  but 
  there 
  are 
  also 
  a 
  number 
  

   of 
  pests 
  of 
  considerable 
  importance. 
  This 
  list 
  is 
  largely 
  based 
  on 
  pre- 
  

   vious 
  records, 
  and 
  many 
  additions 
  would 
  undoubtedly 
  result 
  from 
  special 
  

   collecting. 
  An 
  effort 
  has 
  been 
  made 
  to 
  exclude 
  unreliable 
  records. 
  

   Some 
  of 
  the 
  earlier 
  determinations 
  on 
  which 
  records 
  depend 
  may 
  be 
  

   erroneous, 
  but 
  it 
  is 
  almost 
  impossible 
  to 
  eUminate 
  this 
  source 
  of 
  error. 
  

  

  It 
  is 
  a 
  pleasure 
  to 
  acknowledge 
  the 
  assistance 
  of 
  several 
  coworkers 
  in 
  

   the 
  preparation 
  of 
  this 
  list. 
  Messrs 
  Comstock, 
  Howard, 
  King, 
  Lowe, 
  

   Parrott, 
  Pettit 
  and 
  Slingerland 
  have 
  very 
  kindly 
  called 
  my 
  attendon 
  to 
  

   overlooked 
  records, 
  given 
  suggestions 
  as 
  to 
  the 
  synonymy, 
  and 
  also 
  

   placed 
  at 
  my 
  disposal 
  their 
  own 
  unpublished 
  notes. 
  

  

  