﻿-85- 
  

  

  elder 
  — 
  were 
  from 
  colonies 
  first 
  observed 
  June 
  30th. 
  The 
  latter 
  began 
  to 
  

   emerge 
  July 
  istand 
  nymphs 
  were 
  still 
  numerous 
  July 
  12th. 
  The 
  former 
  

   {conica) 
  was 
  a 
  little 
  later, 
  adults 
  not 
  appearing 
  till 
  July 
  21st. 
  An 
  exami- 
  

   nation 
  July 
  27th 
  of 
  the 
  place 
  where 
  these 
  specimens 
  were 
  found, 
  revealed 
  

   a 
  large 
  number 
  of 
  adults 
  and 
  only 
  a 
  single 
  nymph. 
  Nymphs 
  of 
  this 
  

   species 
  taken 
  on 
  various 
  plants 
  July 
  8th 
  to 
  15th 
  emerged 
  from 
  the 
  17th 
  

   to 
  the 
  19th. 
  Our 
  earliest 
  date 
  for 
  the 
  imago 
  is 
  July 
  6th. 
  Adults 
  of 
  both 
  

   species 
  were 
  seen 
  by 
  us 
  on 
  sugar 
  beets 
  July 
  14th; 
  and 
  they 
  were 
  abundant 
  

   in 
  the 
  early 
  part 
  of 
  August 
  on 
  their 
  favorite 
  food 
  plants. 
  We 
  have 
  col- 
  

   lected 
  adult 
  pruinosa 
  up 
  to 
  the 
  middle 
  of 
  September, 
  and 
  have 
  taken 
  

   single 
  individuals 
  of 
  conica 
  October 
  3d 
  and 
  oi 
  pruinosa 
  November 
  14th. 
  

   This 
  record 
  strongly 
  indicates 
  that 
  there 
  is 
  but 
  one 
  annual 
  brood, 
  

   nymphs 
  occurring 
  from 
  about 
  the 
  middle 
  of 
  May 
  to 
  late 
  in 
  July, 
  and 
  

   iraagos 
  from 
  July 
  to 
  the 
  end 
  of 
  the 
  season. 
  

  

  These 
  insects 
  are 
  especially 
  sensitive 
  to 
  the 
  effects 
  of 
  rainy 
  weather, 
  

   as 
  was 
  strikingly 
  shown 
  by 
  colonies 
  of 
  C. 
  conica 
  on 
  corn. 
  After 
  a 
  heavy 
  

   rain 
  very 
  few 
  could 
  be 
  found 
  on 
  stalks 
  where 
  they 
  had 
  been 
  common 
  

   before, 
  while 
  on 
  plants 
  which 
  afforded 
  them 
  better 
  shelter 
  their 
  numbers 
  

   were 
  not 
  so 
  much 
  diminished. 
  

  

  THE 
  PIGWEED 
  BUG. 
  

   Piesma 
  cine7'ea 
  Say. 
  

   This 
  small, 
  gray, 
  rough 
  and 
  much-flattened, 
  somewhat 
  diamond- 
  

   shaped 
  bug, 
  well 
  shown 
  in 
  Fig. 
  15, 
  was 
  very 
  abundant 
  on 
  pigweed 
  {Atna- 
  

   rantus) 
  in 
  sugar-beet 
  fields 
  in 
  central 
  Illinois 
  July 
  13th, 
  yet 
  scarcely 
  one 
  

   was 
  seen 
  on 
  the 
  beet 
  itself. 
  Experience 
  has 
  shown, 
  

   however, 
  that 
  it 
  will 
  attack 
  the 
  beet 
  energetically 
  if 
  

   its 
  favorite 
  food 
  plant 
  becomes 
  scarce. 
  In 
  Iowa, 
  

   and 
  especially 
  in 
  Nebraska, 
  it 
  has 
  been 
  noticed 
  by 
  

   Osborn 
  and 
  Bruner 
  respectively 
  as 
  very 
  common 
  on 
  

   beets, 
  sometimes 
  doing 
  much 
  harm. 
  It 
  lives 
  also 
  on 
  

   smartweeds, 
  grasses, 
  and 
  a 
  variety 
  of 
  trees, 
  — 
  among 
  

   which 
  the 
  buckeye 
  may 
  be 
  especially 
  mentioned, 
  — 
  

   and 
  occasionally 
  injures 
  the 
  blossom 
  of 
  the 
  grape 
  in 
  

   spring. 
  The 
  effect 
  of 
  its 
  work 
  upon 
  the 
  plant 
  is 
  

  

  Fig. 
  15. 
  The 
  Pigweed 
  -ji. 
  uji-f^j 
  • 
  3 
  i 
  

  

  %n^,Pies,„acinerea. 
  (Os- 
  very 
  evident 
  on 
  badly 
  infested 
  pigweeds, 
  where 
  

   born, 
  u. 
  s. 
  Dept. 
  of 
  Agri- 
  whitish 
  dots 
  thickly 
  mottle 
  the 
  surface, 
  the 
  plants 
  

   *^" 
  ^"^ 
  evidently 
  suffering 
  from 
  loss 
  of 
  effective 
  leafage. 
  Its 
  

  

  life 
  history 
  is 
  not 
  peculiar. 
  Adults 
  are 
  very 
  abundant 
  from 
  late 
  May 
  to 
  

   early 
  July 
  in 
  central 
  Illinois, 
  and 
  again 
  from 
  October 
  onward. 
  They 
  

   winter 
  under 
  any 
  convenient 
  shelter, 
  but 
  are 
  abundant 
  under 
  the 
  loose 
  

   bark 
  of 
  trees, 
  a 
  situation 
  to 
  which 
  they 
  are 
  especially 
  adapted 
  by 
  their 
  

   flattened 
  form. 
  Their 
  occasional 
  abundance 
  is 
  illustrated 
  by 
  the 
  fact 
  

  

  