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  57 
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  DETAILED 
  DISCUSSION 
  OF 
  GROUPS 
  AND 
  INJURIES. 
  

  

  The 
  imperfect 
  state 
  of 
  our 
  knowledge 
  of 
  the 
  sugar-beet 
  insects 
  in 
  

   America 
  has 
  made 
  it 
  important 
  that 
  both 
  the 
  beet 
  grower 
  and 
  the 
  

   investigating 
  economic 
  entomologist 
  should 
  be 
  considered 
  in 
  the 
  prep- 
  

   aration 
  of 
  a 
  detailed 
  account 
  of 
  species 
  and 
  injuries. 
  For 
  the 
  benefit 
  

   of 
  the 
  beet 
  grower 
  the 
  species 
  have 
  been 
  discussed, 
  so 
  far 
  as 
  possible, 
  

   in 
  economic 
  groups, 
  and 
  those 
  which 
  do 
  the 
  principal 
  harm, 
  or 
  seem 
  

   likely 
  to 
  become 
  important 
  enemies 
  to 
  this 
  plant, 
  are 
  treated 
  with 
  

   especial 
  fullness. 
  As 
  an 
  aid 
  to 
  investigation, 
  however, 
  even 
  relatively 
  

   insignificant 
  species 
  have 
  been 
  noticed, 
  and 
  at 
  least 
  mention 
  has 
  been 
  

   made 
  of 
  every 
  insect 
  known 
  by 
  us 
  to 
  be 
  to 
  any 
  extent 
  destructive. 
  

   Considerable 
  attention 
  has 
  also 
  been 
  given 
  to 
  the 
  bibliography 
  of 
  the 
  

   subject, 
  and 
  every 
  bibliographical 
  reference 
  of 
  any 
  importance 
  in 
  our 
  

   possession 
  is 
  contained 
  in 
  the 
  list 
  of 
  papers 
  presented 
  herewith. 
  

  

  Especial 
  acknowledgments 
  are 
  due 
  to 
  Professor 
  Lawrence 
  Bruner, 
  

   of 
  the 
  State 
  University 
  of 
  Nebraska, 
  for 
  a 
  coinplete 
  list 
  of 
  insect 
  species 
  

   known 
  to 
  him 
  as 
  injurious 
  to 
  the 
  sugar 
  beet 
  and 
  for 
  other 
  useful 
  infor- 
  

   mation 
  without 
  which 
  the 
  difficulty 
  of 
  preparing 
  this 
  paper 
  would 
  have 
  

   been 
  very 
  much 
  increased. 
  

  

  Copies 
  of 
  published 
  figures 
  have 
  also 
  been 
  received 
  from 
  Professor 
  

   Bruner 
  and 
  from 
  others 
  as 
  follows: 
  from 
  the 
  Division 
  of 
  Publications 
  

   of 
  the 
  U. 
  S. 
  Department 
  of 
  Agriculture, 
  through 
  the 
  kindness 
  of 
  Dr. 
  L. 
  

   O. 
  Howard, 
  Chief 
  of 
  the 
  Division 
  of 
  Entomology; 
  from 
  Prof. 
  H. 
  E. 
  

   Summers, 
  State 
  Entomologist 
  of 
  Iowa; 
  from 
  Prof. 
  Otto 
  Lugger, 
  State 
  

   Entomologist 
  of 
  Minnesota; 
  from 
  Director 
  C. 
  D. 
  Smith, 
  of 
  the 
  Michigan 
  

   Agricultural 
  Experiment 
  Station; 
  from 
  Director 
  Jas. 
  H. 
  Shepard, 
  of 
  the 
  

   South 
  Dakota 
  Agricultural 
  Experiment 
  Station; 
  from 
  R. 
  W. 
  Doane, 
  

   Assistant 
  Zoologist 
  of 
  the 
  Washington 
  Agricultural 
  Experiment 
  Station; 
  

   from 
  Prof. 
  M. 
  V. 
  Slingerland, 
  Entomologist 
  of 
  the 
  Cornell 
  University 
  

   Agricultural 
  Experiment 
  Station; 
  from 
  Dr. 
  Jas. 
  Fletcher, 
  Dominion 
  

   Entomologist 
  and 
  Botanist 
  to 
  Government 
  Experimental 
  Farms, 
  Ottawa, 
  

   Can 
  ; 
  from 
  Director 
  Chas. 
  D. 
  Woods, 
  of 
  the 
  Maine 
  Agricultural 
  Ex- 
  

   periment 
  Station; 
  and 
  from 
  the 
  J. 
  B. 
  Lippincott 
  Publishing 
  Company, 
  

   Philadelphia. 
  

  

  To 
  Mr. 
  Theo. 
  Hapke, 
  formerly 
  of 
  the 
  Illinois 
  Sugar 
  Refining 
  Com- 
  

   pany 
  at 
  Pekin, 
  and 
  to 
  Prof. 
  P. 
  G. 
  Holden, 
  Superintendent 
  of 
  the 
  

   Agricultural 
  Department 
  of 
  this 
  Company 
  in 
  1900, 
  we 
  are 
  indebted 
  for 
  

   many 
  courtesies 
  shown 
  and 
  assistance 
  given 
  during 
  visits 
  to 
  their 
  premises 
  

   for 
  the 
  study 
  of 
  beet 
  insects 
  in 
  the 
  field. 
  

  

  