﻿— 
  73 
  — 
  

  

  Fig. 
  lo. 
  Platyvietopius 
  

   acutus, 
  adult. 
  

  

  side 
  triangle. 
  The 
  nymph 
  has 
  a 
  light 
  stripe 
  down 
  

   the 
  center, 
  red 
  at 
  the 
  middle 
  and 
  tending 
  to 
  sep- 
  

   arate 
  into 
  two 
  spots 
  upon 
  the 
  back 
  of 
  the 
  abdo- 
  

   men, 
  with 
  a 
  black 
  marginal 
  stripe 
  on 
  each 
  side. 
  

   Gillette 
  reports 
  it 
  from 
  sugar 
  beets, 
  sumach, 
  clem- 
  

   atis, 
  and 
  oak. 
  It 
  occurs 
  mostly 
  on 
  grass 
  and 
  

   weeds, 
  especially 
  in 
  shady 
  situations. 
  Davis 
  lists 
  

   it 
  among 
  the 
  celery 
  leaf-hoppers. 
  We 
  have 
  taken 
  

   the 
  nymph 
  on 
  apple 
  May 
  15th. 
  The 
  species 
  is 
  

   found 
  in 
  Canada 
  and 
  the 
  United 
  States 
  as 
  far 
  

   west 
  as 
  the 
  Rocky 
  Mountains. 
  There 
  are 
  two 
  

   broods 
  annually, 
  adults 
  of 
  the 
  first 
  commonly 
  

   occurring 
  from 
  June 
  15th 
  to 
  July 
  15th, 
  and 
  of 
  

   the 
  second 
  from 
  the 
  early 
  part 
  of 
  August 
  to 
  

   the 
  approach 
  of 
  winter. 
  Nymphs 
  are 
  common 
  

   late 
  in 
  May 
  and 
  in 
  June 
  and 
  again 
  in 
  July 
  

   and 
  August. 
  Its 
  stage 
  of 
  hibernation 
  is 
  not 
  

   definitely 
  known. 
  

  

  Deltocephalus 
  melsheimeri 
  Fitch. 
  

  

  This 
  was 
  one 
  of 
  the 
  leaf-hoppers 
  

   taken 
  in 
  summer 
  and 
  fall 
  on 
  sugar- 
  

   beets 
  at 
  the 
  Experiment 
  Station 
  

   farm. 
  It 
  is 
  especially 
  a 
  grass 
  in- 
  

   sect, 
  sometimes 
  present 
  in 
  myriads 
  

   in 
  lawns 
  and 
  pastures, 
  but 
  avoiding 
  

   shaded 
  situations. 
  The 
  eggs 
  are 
  

   laid 
  in 
  fall 
  in 
  grass, 
  and 
  the 
  adults 
  

   do 
  not 
  survive 
  the 
  winter. 
  There 
  

   are 
  apparently 
  three 
  broods 
  in 
  the 
  

   year. 
  Adults, 
  presumably 
  from 
  

   hibernating 
  eggs, 
  occur 
  in 
  late 
  May 
  

   and 
  in 
  June, 
  and 
  there 
  is 
  a 
  brood 
  of 
  

   nymphs 
  from 
  the 
  last 
  of 
  May 
  into 
  

   July, 
  becoming 
  adult 
  in 
  July 
  and 
  

   August. 
  The 
  next 
  brood 
  of 
  nymphs 
  

   is 
  produced 
  in 
  August 
  and 
  early 
  

   September, 
  maturing 
  and 
  laying 
  

   eggs 
  • 
  by 
  the 
  close 
  of 
  the 
  season. 
  

   These 
  successive 
  changes 
  are 
  about 
  

   Fig. 
  II. 
  Deltocephalus 
  melsheimeri 
  : 
  «, 
  adult; 
  two 
  weeks 
  earlier 
  than 
  those 
  of 
  the 
  

  

  ^, 
  face; 
  iT, 
  head 
  and 
  pronotum 
  from 
  above; 
  f/, 
  female, 
  <; 
  ii 
  • 
  • 
  / 
  r-> 
  

  

  <r, 
  male 
  genitalia; 
  /wing; 
  ^. 
  nymph. 
  (Osborn 
  and 
  lOliOWing 
  SpCCieS 
  {^D 
  . 
  tmmicUS). 
  

  

  Ball.) 
  

  

  