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  plant. 
  It 
  is 
  probably 
  the 
  species 
  mentioned 
  by 
  Bruner 
  in 
  his 
  list 
  of 
  beet 
  

   insects 
  as 
  Erythroneura 
  sp. 
  It 
  was 
  first 
  named 
  and 
  studied 
  as 
  an 
  apple 
  

   insect, 
  and 
  as 
  such 
  in 
  nurseries 
  probably 
  does 
  the 
  greatest 
  damage; 
  but 
  

   it 
  is 
  also 
  injurious 
  to 
  raspberries 
  and 
  garden 
  vegetables, 
  especially 
  

   potatoes 
  and 
  celery, 
  to 
  clover, 
  corn, 
  and 
  sorghurn. 
  It 
  is 
  further 
  

   recorded 
  in 
  our 
  notes 
  on 
  black 
  walnut, 
  Ptelea 
  trifoliata, 
  and 
  elm, 
  as 
  

   well 
  as 
  on 
  oats, 
  rye, 
  grass, 
  and 
  some 
  weeds, 
  and 
  by 
  Gilette 
  on 
  beans, 
  

   plum, 
  wild 
  grape, 
  and 
  cottonwood. 
  Nymphs 
  have 
  been 
  observed 
  on 
  

   celery 
  and 
  other 
  plants, 
  as 
  well 
  as 
  on 
  apple. 
  

  

  On 
  infested 
  young 
  apple-trees 
  the 
  injury 
  is 
  very 
  evident. 
  The 
  

   leaves 
  curl 
  and 
  crinkle 
  and 
  the 
  internodes 
  are 
  shortened, 
  showing 
  

   retardation 
  of 
  growth. 
  No 
  local 
  effect 
  of 
  their 
  punctures 
  on 
  beets 
  has 
  

   been 
  recognized, 
  but 
  in 
  view 
  of 
  the 
  large 
  numbers 
  usually 
  present 
  in 
  

   beet 
  fields 
  there 
  is 
  good 
  reason 
  to 
  believe 
  them 
  capable 
  of 
  injury 
  to 
  

   beets. 
  What 
  we 
  supposed 
  to 
  be 
  the 
  eggs 
  of 
  this 
  species 
  were 
  found 
  in 
  

   slight 
  swellings 
  in 
  the 
  green 
  twigs 
  and 
  the 
  midrib 
  and 
  leaf 
  stem 
  of 
  the 
  

   apple. 
  The 
  nymphs 
  are 
  pale 
  green. 
  

  

  There 
  is 
  considerable 
  uncertainty 
  in 
  using 
  the 
  statements 
  of 
  others 
  

   concerning 
  this 
  insect 
  because 
  of 
  the 
  frequency 
  with 
  which 
  it 
  has 
  been 
  

   confused 
  with 
  other 
  small 
  greenish 
  or 
  yellowish 
  species 
  of 
  its 
  own 
  and 
  

   related 
  genera, 
  descriptions 
  and 
  figures 
  of 
  which 
  may 
  be 
  found 
  in 
  

   Gillette's 
  article 
  on 
  the 
  Typhlocybince 
  in 
  the 
  Proceedings 
  of 
  the 
  U. 
  S. 
  

   National 
  Museum, 
  Volume 
  XX., 
  page 
  709. 
  The 
  row 
  of 
  six 
  (or 
  even 
  

   eight) 
  white 
  dots 
  along 
  the 
  front 
  margin 
  of 
  the 
  prothorax 
  are 
  evident 
  as 
  

   a 
  rule 
  even 
  in 
  alcoholic 
  specimens, 
  and 
  at 
  once 
  distinguish 
  the 
  species. 
  

   If 
  this 
  character 
  is 
  unsatisfactory, 
  reference 
  should 
  be 
  made 
  to 
  the 
  wing 
  

   venation, 
  good 
  figures 
  of 
  which 
  are 
  given 
  by 
  Gillette 
  in 
  his 
  article. 
  

   Specimens 
  in 
  alcohol 
  can 
  be 
  conveniently 
  examined 
  by 
  spreading 
  out 
  

   the 
  wings, 
  when 
  wet, 
  on 
  a 
  glass 
  slide. 
  The 
  species 
  most 
  likely 
  to 
  be 
  

   confused 
  with 
  this 
  are 
  Aletra 
  albostriella, 
  without 
  distinct 
  markings, 
  

   bred 
  by 
  us 
  from 
  basswood, 
  and 
  reported 
  on 
  pear 
  and 
  cherry; 
  Typhlocyba 
  

   rosce, 
  yellowish 
  without 
  markings, 
  found 
  by 
  us 
  common 
  on 
  rose, 
  goose- 
  

   berry, 
  and 
  apple, 
  and 
  reported 
  by 
  Gillette 
  also 
  on 
  cherry, 
  currant, 
  plum, 
  

   grape, 
  oak, 
  and 
  cottonwood; 
  Dicraneura 
  fieberi, 
  already 
  described 
  

   above; 
  Empoasca 
  obtusa, 
  bred 
  by 
  us 
  on 
  apple 
  and 
  collected 
  on 
  willow, 
  

   having 
  similar 
  venation, 
  but 
  of 
  larger 
  size 
  and 
  with 
  the 
  head 
  scarcely 
  

   longer 
  at 
  the 
  middle; 
  and, 
  finally, 
  the 
  species 
  next 
  to 
  be 
  treated, 
  E. 
  

   flavescetis 
  (PI. 
  II., 
  Fig. 
  4), 
  which 
  has 
  been 
  found 
  with 
  malt 
  on 
  apple 
  

   and 
  sugar 
  beets, 
  and 
  in 
  which 
  there 
  are 
  usually 
  three 
  pronotal 
  spots 
  

   instead 
  of 
  six. 
  

  

  Observations 
  on 
  this 
  or 
  a 
  related 
  species 
  show 
  a 
  rather 
  rapid 
  devel- 
  

   opment 
  — 
  from 
  the 
  laying 
  of 
  the 
  egg 
  to 
  the 
  imago 
  within 
  a 
  month. 
  The 
  

   adults 
  were 
  noted 
  as 
  very 
  abundant 
  in 
  late 
  April 
  and 
  early 
  May; 
  common 
  

   and 
  more 
  numerous 
  than 
  the 
  nymphs 
  early 
  in 
  June; 
  on 
  June 
  26th, 
  

  

  