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  leaves 
  of 
  the 
  horse-chestnut 
  in 
  early 
  spring. 
  The 
  species 
  winters 
  in 
  the 
  

   beetle 
  stage, 
  coming 
  out 
  from 
  its 
  hibernation 
  quarters 
  in 
  April 
  or 
  May, 
  

   and 
  attacking 
  its 
  favorite 
  food 
  plants 
  even 
  before 
  

   they 
  appear 
  above 
  ground. 
  The 
  beetles 
  of 
  the 
  

   following 
  brood 
  begin 
  to 
  appear 
  about 
  the 
  second 
  

   week 
  of 
  July 
  and 
  continue 
  abundant 
  until 
  October. 
  

   The 
  details 
  of 
  the 
  life 
  history 
  are 
  not 
  clearly 
  

   known 
  and 
  the 
  number 
  of 
  generations 
  annually 
  

   has 
  not 
  been 
  definitely 
  determined. 
  

  

  Fig. 
  48. 
  The 
  Striped 
  Cu- 
  

   cumber 
  Beetle, 
  Diabrotica 
  

   vittata: 
  a, 
  egg; 
  b, 
  portion 
  of 
  

   its 
  surface 
  greatly 
  enlarged. 
  

   (Chittenden, 
  U. 
  S. 
  Dept. 
  of 
  

   Agriculture.) 
  

  

  The 
  Northern 
  Corn 
  Root 
  Worm. 
  

  

  Diabrotica 
  longicornis 
  Say. 
  

  

  The 
  grass-green 
  adult 
  beetle 
  of 
  this 
  species 
  is 
  more 
  or 
  less 
  abundant 
  

   according 
  to 
  the 
  kind 
  of 
  agriculture 
  prevalent, 
  as 
  it 
  breeds, 
  so 
  far 
  as 
  

   known, 
  only 
  in 
  fields 
  of 
  Indian 
  

   corn, 
  and 
  becomes 
  numerous 
  

   there 
  only 
  where 
  the 
  same 
  land 
  is 
  

   planted 
  to 
  corn 
  for 
  several 
  suc- 
  

   cessive 
  years. 
  It 
  is 
  abroad 
  as 
  a 
  

   beetle 
  during 
  the 
  late 
  summer 
  

   and 
  fall, 
  and 
  dies 
  before 
  winter, 
  

   leaving 
  eggs 
  in 
  the 
  corn 
  field 
  to 
  

   hatch 
  the 
  following 
  spring. 
  It 
  

   lives 
  upon 
  a 
  considerable 
  variety 
  

   of 
  the 
  softer 
  and 
  more 
  succulent 
  

   vegetable 
  tissues 
  of 
  the 
  latter 
  part 
  

   of 
  the 
  season. 
  Although 
  it 
  has 
  

   never 
  been 
  known 
  to 
  eat 
  beet 
  

   leaves 
  it 
  is 
  frequently 
  seen 
  upon 
  

   them, 
  especially 
  in 
  the 
  vicinity 
  of 
  

   corn 
  fields, 
  and 
  the 
  fact 
  that 
  in 
  

   Nebraska 
  it 
  has 
  sometimes 
  riddled 
  the 
  leaves 
  of 
  radishes 
  and 
  turnips 
  

   makes 
  it 
  seem 
  likely 
  that 
  a 
  closer 
  observation 
  of 
  it 
  in 
  the 
  beet 
  field 
  

   would 
  show 
  an 
  occasional 
  similar 
  injury 
  there. 
  

  

  Fig. 
  49. 
  The 
  Northern 
  Corn 
  Root 
  Worm, 
  Dia- 
  

   brotica 
  longicornis, 
  adult. 
  

  

  The 
  French 
  Bugs. 
  

  

  Monoxia 
  puncticollis 
  Say. 
  

  

  Monoxia 
  conspuia 
  Lee. 
  (J/, 
  guttulaia 
  Lee). 
  

  

  Monoxia 
  puncticollis 
  has 
  seriously 
  injured 
  the 
  beet 
  crop 
  in 
  New 
  

   Mexico. 
  It 
  inhabits 
  seacoasts 
  and 
  inland 
  salty 
  places, 
  occurring. 
  along 
  

   the 
  Atlantic 
  coast, 
  in 
  Texas, 
  and 
  in 
  California, 
  and 
  inland 
  in 
  the 
  south- 
  

   western 
  United 
  States 
  as 
  far 
  as 
  Colorado. 
  The 
  larva 
  feeds 
  on 
  the 
  sea- 
  

  

  