﻿SCALE 
  INSECTS 
  OF 
  IMPORTANCE 
  35I 
  

  

  Aspidiotus 
  ancylus 
  Putnam 
  

  

  PLATE 
  II, 
  FIGURE 
  2 
  AND 
  PLATE 
  15, 
  FIGURE 
  I 
  

  

  This 
  species 
  possesses 
  in 
  general 
  but 
  a 
  single 
  pair 
  of 
  lobes, 
  the 
  median 
  

   ones, 
  which 
  vary 
  considerably 
  in 
  length 
  and 
  outline, 
  but 
  in 
  a 
  fresh 
  adult 
  

   female 
  they 
  are 
  usually 
  quite 
  long 
  and 
  nearly 
  straight 
  on 
  the 
  inner 
  and 
  

   outer 
  margins, 
  with 
  the 
  tips 
  rounded 
  and 
  notched 
  on 
  the 
  outer 
  edge, 
  and 
  

   often 
  also 
  on 
  the 
  inner 
  edge 
  near 
  the 
  tip. 
  Reference 
  to 
  the 
  figures 
  will 
  

   explain 
  this 
  statement. 
  When 
  worn 
  by 
  long 
  and 
  rough 
  use, 
  the 
  lobes 
  

   may 
  be 
  much 
  shorter 
  and 
  worn 
  to 
  an 
  oblique 
  curve 
  instead 
  of 
  the 
  form 
  

   above 
  described. 
  They 
  sometimes 
  approximate 
  slightly 
  at 
  the 
  tips. 
  

   Occasionally 
  rudiments 
  of 
  other 
  lobes 
  can 
  be 
  made 
  out. 
  

  

  Spines 
  are 
  as 
  usual. 
  Plates 
  are 
  quite 
  numerous 
  fringing 
  the 
  segment; 
  

   two 
  or 
  three 
  occur 
  at 
  each 
  incision. 
  Comstock 
  speaks 
  of 
  them 
  as 
  usually 
  

   simple, 
  but 
  they 
  are 
  at 
  least 
  frequently 
  toothed 
  in 
  the 
  mounts 
  I 
  have 
  

   examined. 
  There 
  are 
  three 
  to 
  four 
  or 
  five 
  irregular 
  and 
  usually 
  simple 
  

   and 
  slender 
  plates 
  between 
  the 
  third 
  and 
  fourth 
  pairs 
  of 
  spines. 
  The 
  

   incisions 
  are 
  wide 
  and 
  not 
  deep. 
  

  

  The 
  chitinous 
  processes 
  at 
  the 
  incisions 
  are 
  variable, 
  being 
  often 
  quite 
  

   large. 
  The 
  one 
  on 
  the 
  inner 
  margin 
  of 
  the 
  first 
  incision 
  is 
  frequently 
  

   much 
  larger 
  than 
  the 
  opposite 
  one, 
  but 
  they 
  may 
  be 
  subequal. 
  They 
  are 
  

   of 
  the 
  straighter 
  type, 
  resembling 
  A. 
  ostreaeformis 
  in 
  this 
  rather 
  

   than 
  A. 
  perniciosus 
  and 
  A. 
  forbesi. 
  The 
  median 
  ones 
  are 
  

   usually 
  quite 
  large 
  and 
  prominent, 
  but 
  straight. 
  

  

  The 
  ventral 
  glands 
  are 
  in 
  four 
  or 
  five 
  groups 
  : 
  the 
  anterior 
  ones 
  are 
  

   0-6, 
  the 
  anterior 
  laterals 
  6-14, 
  the 
  posterior 
  laterals, 
  5-8. 
  These 
  

   numbers 
  are 
  on 
  Comstock's 
  authority. 
  The 
  glands 
  show 
  usually 
  a 
  some- 
  

   what 
  linear 
  or 
  scattering 
  arrangement 
  not 
  the 
  compact 
  circular 
  appear- 
  

   ance 
  of 
  typical 
  A. 
  ostreaeformis. 
  The 
  ventral 
  thickenings 
  are 
  

   usually 
  vague 
  and 
  irregular. 
  The 
  anus 
  does 
  not 
  differ 
  strikingly 
  from 
  

   A. 
  ostreaeformis. 
  

  

  The 
  dorsal 
  pores 
  present 
  quite 
  a 
  range 
  of 
  variation. 
  Dr 
  Marlatt 
  

   informs 
  me 
  that 
  they 
  are 
  typically 
  much 
  fewer 
  than 
  in 
  A 
  ostreaeformis 
  

   or 
  A. 
  juglans-regiae. 
  The 
  office 
  collection 
  shows 
  many 
  specimens, 
  

   however, 
  where 
  they 
  are 
  abundant, 
  appearing 
  usually 
  in 
  three 
  or 
  even 
  

   four 
  well 
  defined 
  rows. 
  On 
  each 
  side 
  of 
  the 
  median 
  line 
  one 
  row 
  ex- 
  

   tends 
  from 
  the 
  second 
  incision 
  toward 
  the 
  lateral 
  transverse 
  thickeningj 
  

   another 
  laterad 
  of 
  this 
  extends 
  clear 
  to 
  the 
  outer 
  margin 
  of 
  the 
  same 
  

   thickening 
  and 
  there 
  is 
  still 
  another, 
  though 
  shorter 
  one, 
  outside 
  of 
  this, 
  

   while 
  a 
  group 
  of 
  three 
  or 
  a 
  line 
  of 
  four 
  or 
  five 
  appears 
  at 
  the 
  first 
  incision. 
  

  

  