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  11 
  — 
  

  

  data 
  as 
  to 
  their 
  life 
  history 
  are 
  too 
  scanty 
  to 
  show 
  the 
  number 
  of 
  broods. 
  

   Abdominalis 
  has 
  been 
  taken 
  mostly 
  in 
  June 
  and 
  August, 
  while 
  our 
  speci- 
  

   mens 
  of 
  impictus 
  were 
  nearly 
  all 
  captured 
  in 
  May 
  and 
  July. 
  

  

  Cicadula 
  6-notata 
  Fall. 
  

   (^Cicadula 
  4-lineata 
  Forbes.) 
  

   (PI. 
  II., 
  Fig. 
  I.) 
  

   The 
  two 
  pairs 
  of 
  black 
  bars 
  and 
  two 
  dots 
  on 
  the 
  head 
  above 
  form 
  

   the 
  unmistakable 
  trade-mark 
  of 
  this 
  little 
  green 
  species, 
  one 
  of 
  the 
  most 
  

   abundant 
  in 
  Illinois 
  beet 
  fields 
  throughout 
  the 
  season. 
  It 
  has 
  a 
  wide 
  but 
  

   rather 
  northerly 
  distribution, 
  — 
  reaching 
  to 
  Canada, 
  Connecticut, 
  Mis- 
  

   sissippi, 
  California, 
  and 
  Alaska, 
  — 
  and 
  a 
  great 
  variety 
  of 
  food 
  plants, 
  

   among 
  which 
  the 
  grasses 
  and 
  small 
  grains 
  take 
  a 
  prominent 
  place. 
  

   Davis 
  records 
  it 
  as 
  the 
  most 
  abundant 
  of 
  the 
  celery 
  leaf-hoppers. 
  We 
  

   have 
  reported 
  it 
  as 
  especially 
  injurious 
  to 
  wheat 
  (Fourteenth 
  Report, 
  

   page 
  68), 
  and 
  have 
  also 
  collected 
  it 
  from 
  oats, 
  corn, 
  sorghum, 
  blue- 
  

   grass 
  and 
  other 
  grasses, 
  apple, 
  elm, 
  willow, 
  cucumbers, 
  dog-fennel, 
  and 
  

   other 
  weeds. 
  No 
  adults 
  have 
  been 
  taken 
  later 
  than 
  the 
  middle 
  of 
  

   November 
  or 
  before 
  the 
  middle 
  of 
  May. 
  The 
  species 
  doubtless 
  hiber- 
  

   nates 
  as 
  an 
  egg. 
  Apparently 
  there 
  are 
  two 
  broods, 
  the 
  adults 
  being 
  

   most 
  abundant 
  in 
  the 
  latter 
  half 
  of 
  May 
  and 
  in 
  June, 
  and 
  again 
  in 
  the 
  

   fall 
  months 
  — 
  from 
  September 
  ist 
  to 
  the 
  close 
  of 
  the 
  season. 
  

  

  Dicraneiira 
  fieberi 
  Loew. 
  

   This 
  leaf-hopper 
  closely 
  resembles 
  the 
  species 
  next 
  mentioned, 
  but 
  

   it 
  is 
  slightly 
  larger 
  and 
  more 
  amber-colored, 
  and 
  without 
  definite 
  mark- 
  

   ings 
  on 
  the 
  thorax, 
  the 
  most 
  important 
  difference 
  being 
  in 
  the 
  wing 
  

   venation. 
  It 
  has 
  occasionally 
  been 
  taken 
  by 
  us 
  on 
  sugar 
  beets 
  in 
  Illinois. 
  

   It 
  is 
  found 
  from 
  Massachusetts 
  to 
  Kansas, 
  but 
  it 
  is 
  not 
  very 
  abundant. 
  

   We 
  have 
  taken 
  it 
  also 
  on 
  grass-lands 
  and 
  in 
  woods, 
  and 
  on 
  elm 
  and 
  soft 
  

   maple-trees. 
  Specimens 
  have 
  been 
  taken 
  from 
  late 
  in 
  May 
  through 
  

   July, 
  and 
  again 
  from 
  near 
  the 
  end 
  of 
  August 
  to 
  early 
  in 
  November, 
  thus 
  

   indicating 
  two 
  broods 
  and 
  hibernation 
  in 
  the 
  egg. 
  

  

  Empoasca 
  mali 
  LeBaron. 
  

   {^Empoa 
  albopicta 
  Forbes.) 
  

   (PI. 
  II., 
  Fig. 
  3-) 
  

   Although 
  not 
  destructive 
  in 
  grass-lands, 
  this 
  delicate 
  little 
  shining- 
  

   winged, 
  yellow-green 
  insect 
  is 
  probably 
  our 
  worst 
  all-round 
  leaf-hopper 
  

   pest, 
  so 
  excessively 
  abundant 
  that 
  notwithstanding 
  its 
  varied 
  diet 
  it 
  is 
  

   able 
  to 
  make 
  a 
  serious 
  attack 
  on 
  quite 
  a 
  number 
  of 
  the 
  cultivated 
  plants 
  

   of 
  its 
  list. 
  It 
  is 
  extremely 
  abundant 
  on 
  sugar 
  beets 
  everywhere, 
  both 
  in 
  

   the 
  nymph 
  and 
  adult 
  stages, 
  thus 
  showing 
  its 
  ability 
  to 
  breed 
  on 
  this 
  

  

  