﻿— 
  87 
  — 
  

  

  green 
  or 
  red 
  frequent 
  in 
  their 
  coloration. 
  From 
  the 
  next 
  group, 
  the 
  

   Lygmd(B, 
  representatives 
  of 
  which 
  are 
  also 
  found 
  in 
  the 
  beet 
  field, 
  they 
  

   may 
  be 
  distinguished 
  on 
  close 
  examination 
  by 
  the 
  character 
  of 
  the 
  veins 
  

   in 
  the 
  membranous 
  part 
  of 
  the 
  fore 
  wing. 
  In 
  this 
  membrane 
  in 
  the 
  

   CapsidiB 
  the 
  only 
  veins 
  are 
  at 
  the 
  outer 
  (anterior) 
  edge 
  of 
  the 
  wing, 
  

   where 
  they 
  inclose 
  two 
  small 
  areas 
  or 
  so-called 
  cells, 
  while 
  in 
  the 
  wing 
  

   membrane 
  of 
  the 
  LygceidcB 
  there 
  are 
  four 
  or 
  five 
  unbranched 
  veins, 
  some 
  

   of 
  which 
  start 
  from 
  a 
  single 
  cell 
  at 
  the 
  base. 
  

  

  Most 
  of 
  the 
  plant-bugs 
  whose 
  life 
  history 
  is 
  known, 
  winter 
  as 
  adults 
  

   under 
  fallen 
  leaves 
  and 
  similar 
  rubbish, 
  emerging 
  in 
  early 
  spring 
  to 
  lay 
  

   their 
  eggs, 
  and 
  perishing 
  soon 
  after 
  this 
  function 
  is 
  performed. 
  Their 
  

   injuries 
  increase 
  with 
  the 
  growth 
  of 
  the 
  young 
  and 
  with 
  the 
  appearance, 
  

   in 
  some 
  cases, 
  of 
  later 
  broods. 
  

  

  The 
  observer 
  of 
  beet 
  insects 
  may 
  learn 
  to 
  distinguish 
  the 
  more 
  

   abundant 
  species 
  of 
  leaf 
  plant-bugs 
  of 
  the 
  beet 
  field 
  by 
  attending 
  to 
  a 
  

   few 
  conspicuous 
  differences. 
  The 
  false 
  flea-hopper 
  i^Agalliastes 
  associ- 
  

   atus 
  — 
  PI. 
  III., 
  Fig. 
  3) 
  is 
  about 
  a 
  sixteenth 
  of 
  an 
  inch 
  in 
  length 
  and 
  of 
  

   a 
  uniform 
  dull 
  blackish 
  color, 
  only 
  the 
  semi-translucent 
  membranous 
  

   tips 
  of 
  the 
  wings 
  lightening 
  to 
  a 
  sooty 
  brown. 
  It 
  hops 
  actively 
  when 
  

   disturbed, 
  like 
  a 
  common 
  flea. 
  The 
  garden 
  flea-hopper 
  {^Halticus 
  uhleri 
  

   — 
  Fig. 
  17), 
  also 
  about 
  a 
  sixteenth 
  of 
  an 
  inch 
  in 
  length, 
  is 
  shining 
  black 
  

   and 
  jumps 
  readily 
  like 
  the 
  preceding. 
  It 
  is 
  in 
  two 
  forms; 
  one 
  with 
  

   long 
  wings, 
  with 
  an 
  obscure 
  white 
  point 
  at 
  the 
  tip 
  of 
  the 
  thickened 
  part 
  

   of 
  the 
  wing, 
  and 
  the 
  other 
  with 
  short 
  black 
  wings 
  not 
  marked 
  with 
  

   white. 
  Plagiognathus 
  obscurus 
  is 
  about 
  an 
  eighth 
  of 
  an 
  inch 
  long, 
  dull 
  

   blackish, 
  with 
  bicolored 
  legs 
  — 
  the 
  thighs 
  dark 
  and 
  the 
  tibiae 
  pale 
  — 
  and 
  

   a 
  narrow 
  pale 
  bar 
  across 
  each 
  wing 
  near 
  its 
  tip. 
  Garganus 
  fiisiformis 
  

   is 
  nearly 
  a 
  quarter 
  of 
  an 
  inch 
  in 
  length, 
  bordered 
  with 
  yellowish 
  red, 
  

   with 
  a 
  white 
  streak 
  down 
  the 
  middle. 
  The 
  neck 
  is 
  white, 
  the 
  legs 
  are 
  

   red, 
  and 
  the 
  middle 
  joint 
  of 
  the 
  antenna 
  is 
  greatly 
  swollen 
  and 
  black. 
  

   Eccritotarsus 
  elegans 
  is 
  about 
  a 
  sixteenth 
  of 
  an 
  inch 
  long, 
  varying 
  from 
  

   dusky 
  to 
  velvety 
  black 
  and 
  gaily 
  marked 
  with 
  white. 
  One 
  of 
  the 
  com- 
  

   moner 
  species 
  on 
  sugar 
  beets 
  is 
  the 
  tarnished 
  plant-bug 
  {Lygus 
  pratensis 
  

   — 
  Fig. 
  18). 
  It 
  is 
  about 
  a 
  fifth 
  of 
  an 
  inch 
  long, 
  of 
  a 
  variable 
  brassy 
  

   brown, 
  with 
  black 
  marks 
  on 
  the 
  thorax 
  above. 
  The 
  young 
  (Fig. 
  19) 
  

   have 
  two 
  or 
  three 
  pairs 
  of 
  round 
  black 
  dots 
  on 
  the 
  back. 
  This 
  plant- 
  

   bug 
  is 
  abundant 
  everywhere 
  throughout 
  the 
  year, 
  especially 
  on 
  low- 
  

   growing 
  vegetation, 
  excepting 
  grass. 
  Calocoris 
  rapidus 
  (Fig. 
  20) 
  is 
  

   longer 
  and 
  narrower 
  than 
  the 
  foregoing, 
  with 
  parallel 
  sides, 
  uniform 
  

   da.rk 
  brown 
  above, 
  very 
  narrowly 
  edged 
  with 
  yellow. 
  It 
  is 
  further 
  

   marked 
  by 
  a 
  carmine 
  shade 
  across 
  the 
  tip 
  of 
  the 
  leathery 
  part 
  of 
  the 
  

   wing. 
  The 
  young 
  (Fig. 
  21) 
  are 
  more 
  or 
  less 
  colored 
  with 
  bright 
  red 
  on 
  

   the 
  antennae, 
  the 
  legs, 
  the 
  front 
  part 
  of 
  the 
  body, 
  and 
  the 
  abdomen. 
  

   The 
  green 
  leaf-bug 
  {^Macrocoleus 
  chlorionis 
  — 
  PI. 
  IV., 
  Fig. 
  i) 
  is 
  under 
  a 
  

  

  