﻿— 
  75 
  — 
  

  

  Osborn 
  noticed 
  that 
  as 
  many 
  as 
  ten 
  per 
  cent, 
  of 
  the 
  larvae 
  found 
  in 
  

   spring 
  were 
  infested 
  by 
  red 
  mites. 
  

  

  Deltocephalus 
  nigrifrons 
  Forbes. 
  

  

  {^Cicadida 
  nigrifrons 
  Forbes.) 
  

  

  (PI. 
  II., 
  Fig. 
  2.) 
  

  

  This 
  leaf-hopper, 
  abundant 
  in 
  Illinois 
  beet 
  fields, 
  is 
  also 
  a 
  destruc- 
  

   tive 
  grass 
  pest. 
  and 
  has 
  been 
  recorded 
  as 
  injurious 
  to 
  corn, 
  wheat, 
  and 
  

   oats. 
  It 
  is 
  known 
  from 
  New 
  York, 
  Louisiana, 
  and 
  California, 
  and 
  in- 
  

   termediate 
  localities, 
  and 
  is 
  very 
  common 
  in 
  Illinois. 
  Two 
  forms 
  exist, 
  

   one 
  larger 
  and 
  lighter 
  colored 
  than 
  the 
  other, 
  with 
  defective 
  wing 
  vena- 
  

   tion, 
  and 
  using 
  its 
  wings 
  comparatively 
  little. 
  These 
  differences 
  are 
  

   perhaps 
  to 
  be 
  connected, 
  like 
  those 
  of 
  the 
  two 
  broods 
  of 
  Oncometopia 
  

   undaia, 
  with 
  differences 
  of 
  brood 
  and 
  season. 
  

  

  No 
  adults 
  of 
  the 
  species 
  have 
  been 
  taken 
  in 
  winter, 
  and 
  it 
  almost 
  

   certainly 
  hibernates 
  in 
  the 
  egg. 
  There 
  are 
  probably 
  two 
  broods, 
  adults 
  

   of 
  the 
  first 
  generation 
  being 
  abundant 
  in 
  June 
  and 
  July 
  and 
  those 
  of 
  the 
  

   second 
  in 
  fall. 
  We 
  noted 
  them 
  here 
  in 
  large 
  numbers 
  at 
  electric 
  lights 
  

   June 
  3d 
  to 
  7th 
  and 
  again 
  June 
  15th. 
  Nymphs 
  are 
  common 
  about 
  the 
  

   first 
  of 
  June 
  and 
  in 
  August. 
  

  

  Athysanus 
  sp. 
  

  

  Bruner 
  reports 
  an 
  undetermined 
  genus 
  of 
  this 
  species 
  as 
  occurring 
  

   upon 
  the 
  beet 
  in 
  Nebraska.* 
  

  

  Eutettix 
  seminuda 
  Say. 
  

  

  This 
  is 
  not 
  a 
  very 
  common 
  leaf-hopper, 
  but 
  as 
  it 
  has 
  frequently 
  

   been 
  observed 
  on 
  beets 
  it 
  is 
  included 
  here. 
  It 
  is 
  found 
  in 
  the 
  eastern 
  

   United 
  States 
  and 
  in 
  Canada, 
  and 
  has 
  attracted 
  economic 
  notice 
  only 
  as 
  a 
  

   cotton 
  insect. 
  It 
  is 
  often 
  seen 
  on 
  cotton 
  stalks 
  in 
  Mississippi, 
  and 
  has 
  

   been 
  observed 
  to 
  feed 
  upon 
  this 
  plant 
  by 
  Mr. 
  Ashmead, 
  who 
  remarks 
  

   that 
  it 
  is 
  a 
  very 
  omnivorous 
  feeder, 
  not 
  likely 
  to 
  cause 
  serious 
  injury 
  to 
  

   any 
  one 
  plant. 
  It 
  is 
  also 
  recorded 
  on 
  birch, 
  wild 
  black 
  cherry, 
  and 
  

   various 
  bushes 
  and 
  low 
  trees. 
  Little 
  is 
  known 
  of 
  its 
  life 
  history, 
  but 
  

   the 
  season 
  of 
  occurrence 
  of 
  adults 
  corresponds 
  fairly 
  well 
  with 
  that 
  of 
  

   the 
  next 
  species. 
  It 
  has 
  been 
  taken 
  in 
  the 
  South 
  from 
  the 
  middle 
  of 
  

   May, 
  and 
  in 
  Illinois 
  from 
  about 
  the 
  middle 
  of 
  June 
  to 
  the 
  end 
  of 
  

   October. 
  

  

  Eutettix 
  tenella 
  Uhl. 
  

  

  Recorded 
  by 
  Gillette 
  and 
  Baker 
  as 
  common 
  on 
  sugar 
  beets 
  in 
  

   August. 
  The 
  species 
  probably 
  does 
  not 
  occur 
  in 
  Illinois. 
  

  

  *Bull. 
  No. 
  23, 
  U. 
  S. 
  Dept. 
  Agr., 
  Div. 
  Ent., 
  p. 
  ry. 
  

  

  