﻿REPORT 
  OF 
  THE 
  STATE 
  ENTOMOLOGIST 
  29I 
  

  

  covered 
  with 
  a 
  very 
  fine 
  prninose 
  powder, 
  resembling 
  mold; 
  some 
  hav- 
  

   ing 
  small 
  scales 
  or 
  rudimentary 
  wings, 
  showing 
  them 
  to 
  be 
  pupae 
  ; 
  

   their 
  cast 
  skins 
  thickly 
  interspersed 
  among 
  them, 
  resembling 
  white 
  

   meal; 
  the 
  larger 
  galls 
  with 
  only 
  the 
  walls 
  of 
  the 
  cavity 
  covered, 
  and 
  

   crowded 
  with 
  similar 
  lice. 
  

  

  Exception 
  should 
  be 
  taken 
  to 
  Dr. 
  Fitch's 
  comparison 
  of 
  the 
  galls 
  to 
  

   *' 
  little 
  round 
  balls 
  of 
  different 
  sizes." 
  All 
  that 
  have 
  come 
  under 
  my 
  

   observation 
  are 
  elongated, 
  and 
  decidedly 
  pyriform 
  in 
  shape, 
  as 
  may 
  be 
  

   seen 
  in 
  figure 
  i 
  of 
  Plate 
  XIV, 
  which 
  fairly 
  represents 
  quite 
  a 
  num- 
  

   ber 
  of 
  others 
  in 
  the 
  state 
  collection. 
  It 
  is 
  probable, 
  however, 
  that 
  

   examples 
  of 
  rounded 
  forms 
  may 
  at 
  times 
  occur, 
  if 
  we 
  may 
  judge 
  

   from 
  the 
  peculiarly 
  shaped 
  one 
  (almost 
  semi-globular) 
  represented 
  by 
  

   Walsh-Riley 
  in 
  the 
  figure 
  given 
  by 
  them, 
  and 
  reproduced 
  by 
  Dr. 
  Thomas 
  

   in 
  the 
  Sch 
  Missouri 
  Report, 
  and 
  also 
  by 
  Dr. 
  Packard 
  in 
  his 
  " 
  Guide 
  to 
  

   the 
  Study 
  of 
  Insects." 
  

  

  Description 
  of 
  the 
  Imago. 
  

  

  Winged 
  female, 
  0.06 
  in 
  length, 
  and 
  to 
  the 
  end 
  of 
  wings 
  o.io 
  ; 
  pale 
  dull 
  

   green 
  or 
  yellowish-green 
  ; 
  head 
  and 
  antennae 
  black 
  ; 
  base 
  of 
  thorax 
  

   blackish, 
  and 
  its 
  anterior 
  part 
  light 
  yellow 
  ; 
  legs 
  pale 
  ; 
  wings 
  hyaline, 
  

   but 
  not 
  clear 
  and 
  glass-like, 
  their 
  veins 
  black, 
  the 
  third 
  one 
  abortive 
  

   nearly 
  half 
  its 
  length, 
  the 
  stigma 
  salt-white; 
  abdomen 
  commonly 
  thinly 
  

   covered 
  on 
  the 
  back 
  with 
  fine 
  pruinose 
  matter, 
  its 
  middle 
  rather 
  deeper 
  

   green 
  ; 
  antennae 
  shorter 
  than 
  the 
  thorax, 
  thread-like, 
  four 
  -jointed, 
  the 
  

   first 
  joint 
  shghtly 
  the 
  shortest, 
  and 
  the 
  second 
  joint 
  rather 
  the 
  longest. 
  

   (Fitch.) 
  

  

  Mr. 
  Walsh 
  has 
  taken 
  exception 
  to 
  the 
  above 
  description, 
  in 
  the 
  

  

  following 
  criticism 
  : 
  

  

  Dr. 
  Fitch's 
  description 
  of 
  the 
  winged 
  female 
  of 
  this 
  species 
  applies 
  

   only 
  to 
  immature 
  specimens 
  extracted 
  from 
  the 
  gall. 
  After 
  they 
  have 
  

   been 
  out 
  some 
  time, 
  the 
  legs 
  and 
  the 
  whole 
  body, 
  except 
  the 
  collar 
  

   which 
  becomes 
  very 
  pale 
  brown, 
  turns 
  to 
  a 
  decided 
  black; 
  and 
  the 
  

   stigma 
  then 
  is 
  not 
  " 
  salt- 
  w^hite," 
  but 
  pale 
  dusky 
  with 
  a 
  whitish 
  reflection. 
  

  

  Life-History 
  and 
  Food-Plants. 
  

  

  The 
  life-history 
  of 
  the 
  species, 
  so 
  far 
  as 
  known, 
  may 
  be 
  briefly 
  sum- 
  

   marized 
  as 
  follows 
  : 
  The 
  growth 
  of 
  the 
  gall 
  commences 
  in 
  the 
  spring, 
  

   when 
  it 
  may 
  be 
  found 
  occupied 
  by 
  the 
  wingless 
  mother 
  louse 
  in 
  company 
  

   with 
  her 
  progeny 
  in 
  their 
  larval 
  stage. 
  The 
  occupants 
  multiply 
  rapidly, 
  

   increasing 
  largely 
  in 
  number 
  until 
  during 
  September, 
  when 
  the 
  gall 
  

   matures 
  and 
  gives 
  forth 
  the 
  colony, 
  all 
  becoming 
  winged 
  eventually. 
  

  

  The 
  same 
  gall 
  occurs 
  on 
  iht 
  Jihus 
  glabra 
  diXidtht 
  Rhus 
  typhina. 
  In 
  

   a 
  note 
  pubhshed 
  in 
  Insect 
  Life 
  (loc. 
  cit.) 
  it 
  is 
  stated 
  that 
  the 
  galls 
  of 
  this 
  

   insect 
  on 
  Rhus 
  glabra 
  contain 
  nearly 
  as 
  much 
  tannin 
  as 
  the 
  ordinary 
  

  

  