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  The 
  Cabbage 
  Flea-beetle. 
  

  

  Phyllotreta 
  vittata 
  Fabr. 
  

  

  This 
  minute 
  insect, 
  from 
  a 
  tenth 
  to 
  a 
  twelfth 
  of 
  an 
  inch 
  in 
  length, 
  

   black 
  with 
  two 
  longitudinal 
  yellowish 
  stripes 
  — 
  narrower 
  in 
  the 
  middle 
  

  

  and 
  sometimes 
  broken 
  into 
  four 
  yellow 
  

   spots, 
  is 
  a 
  destructive 
  enemy 
  to 
  crucif- 
  

   erous 
  plants, 
  especially 
  to 
  cabbage, 
  

   turnips, 
  and 
  radishes. 
  The 
  worst 
  in- 
  

   jury 
  is 
  done 
  by 
  the 
  larvae, 
  which 
  live 
  

   upon 
  the 
  roots, 
  but 
  the 
  leaves 
  are 
  often 
  

   very 
  badly 
  pitted 
  or 
  riddled 
  by 
  the 
  

   beetles. 
  Beets 
  are 
  not 
  injured, 
  so 
  far 
  

   as 
  known, 
  by 
  this 
  beetle 
  to 
  any 
  serious 
  

   extent, 
  although 
  the 
  adults 
  occur 
  upon 
  

   them 
  occasionally 
  in 
  considerable 
  num- 
  

   bers. 
  The 
  species 
  hibernates 
  as 
  an 
  

   imago, 
  occurring 
  in 
  our 
  collections 
  in 
  

   November, 
  December, 
  and 
  March. 
  

   Plants 
  are 
  likely 
  to 
  be 
  injured 
  by 
  them 
  

   in 
  the 
  latter 
  part 
  of 
  May; 
  larvae 
  are 
  produced 
  late 
  in 
  May 
  and 
  June; 
  

   and 
  beetles 
  are 
  developed 
  from 
  these 
  in 
  the 
  latter 
  part 
  of 
  August. 
  The 
  

   species 
  is 
  doubtless 
  single-brooded, 
  at 
  least 
  in 
  central 
  Illinois. 
  

  

  Fig. 
  43. 
  The 
  Cabbage 
  Flea-beetle, 
  Phyllo- 
  

   treta 
  vittata: 
  a, 
  larva; 
  b, 
  adult. 
  (Riley, 
  U. 
  

   S. 
  Dept. 
  of 
  Agriculture). 
  

  

  Phyllotreta 
  decipiens 
  Horn. 
  

  

  This 
  is 
  an 
  insect 
  of 
  the 
  far 
  West, 
  inhabiting 
  Washington 
  and 
  Ore- 
  

   gon, 
  and 
  reported 
  injurious 
  to 
  beets, 
  radishes, 
  turnips, 
  potatoes, 
  etc., 
  

   in 
  the 
  latter 
  state. 
  It 
  has 
  the 
  general 
  appearance 
  of 
  P. 
  vittata, 
  except 
  

   that 
  its 
  black 
  color 
  is 
  varied 
  only 
  by 
  a 
  short 
  indistinct 
  yellowish 
  line 
  

   on 
  each 
  wing-cover, 
  this, 
  indeed, 
  being 
  sometimes 
  wanting. 
  

  

  Fig. 
  44. 
  The 
  Western 
  

   Cabbage 
  Fie 
  a- 
  beetle, 
  

   Phyllotreta 
  albionica, 
  

   (Riley. 
  U. 
  S. 
  Dept. 
  of 
  

   Agriculture.) 
  

  

  The 
  Western 
  Cabbage 
  Flea-beetle. 
  

  

  Phyllotreta 
  albionica 
  Lee. 
  

  

  This 
  species 
  is 
  common 
  in 
  Colorado, 
  occupying 
  

   there 
  the 
  place 
  of 
  P. 
  vittata 
  in 
  the 
  Eastern 
  States. 
  

   The 
  adults 
  are 
  very 
  small, 
  — 
  only 
  about 
  a 
  fifteenth 
  

   of 
  an 
  inch 
  in 
  length, 
  — 
  black 
  above, 
  with 
  a 
  brassy 
  

   luster, 
  and 
  without 
  longitudinal 
  stripes. 
  They 
  are 
  

   reported 
  by 
  Bruner 
  as 
  injuring 
  sugar 
  beets 
  in 
  Ne- 
  

   braska; 
  and 
  by 
  Gillette 
  as 
  infesting 
  cauliflower 
  and 
  

   other 
  cruciferous 
  plants 
  and 
  the 
  bee-plant 
  {Cleome 
  

   iniegrifolia). 
  The 
  immature 
  stages 
  and 
  life 
  history 
  

   are 
  unknown. 
  

  

  