﻿— 
  So 
  — 
  

  

  THE 
  TREE-HOPPERS. 
  

  

  Alembracidce. 
  

  

  Acutalis 
  calva 
  Say. 
  

   As 
  might 
  naturally 
  be 
  expected, 
  the 
  tree-hoppers 
  live 
  mostly 
  on 
  

   trees. 
  A 
  few, 
  however, 
  may 
  occur 
  on 
  herbaceous 
  plants, 
  such 
  as 
  the 
  

   present 
  species, 
  which 
  we 
  noticed 
  on 
  the 
  sugar 
  beet 
  in 
  the 
  latter 
  part 
  of 
  

   June. 
  It 
  is 
  about 
  an 
  eighth 
  of 
  an 
  inch 
  long, 
  triangular 
  when 
  seen 
  from 
  

   above, 
  blunt 
  in 
  front, 
  acute 
  behind, 
  black 
  above, 
  the 
  wings 
  on 
  each 
  side 
  

   yellowish 
  white. 
  Its 
  favorite 
  food 
  seems 
  to 
  be 
  the 
  "Joe 
  Pye 
  weed 
  " 
  

   (^Eupatorium 
  purpureuni), 
  but 
  we 
  have 
  taken 
  a 
  few 
  on 
  honey-locust 
  and 
  

   it 
  is 
  reported 
  on 
  buckwheat 
  by 
  Webster.* 
  Our 
  specimens 
  were 
  mostly 
  

   taken 
  in 
  the 
  latter 
  part 
  of 
  June. 
  The 
  life 
  history 
  of 
  the 
  species 
  is 
  not 
  

   known 
  to 
  us. 
  It 
  is 
  found 
  throughout 
  the 
  United 
  States 
  east 
  of 
  the 
  

   Rocky 
  Mountains 
  and 
  in 
  Mexico. 
  

  

  Leaves 
  variously 
  spotted 
  and 
  blotched 
  and 
  sometimes 
  minutely 
  specked. 
  

   Suctorial 
  insects 
  present 
  which 
  are 
  not 
  leaf-hoppers. 
  

  

  PLANT-LICE.^ 
  

   Aphididce. 
  

  

  Occasionally 
  where 
  the 
  beet 
  leaf 
  is 
  visibly 
  but 
  obscurely 
  injured, 
  

   as 
  shown 
  by 
  a 
  blotchy 
  discoloration 
  of 
  the 
  surface 
  or 
  by 
  a 
  crinkling 
  and 
  

   curling 
  of 
  the 
  leaf, 
  small, 
  sluggish, 
  inactive 
  bluish 
  green 
  or 
  blackish 
  

   insects 
  known 
  as 
  plant-lice 
  {aphides) 
  may 
  be 
  found 
  clustered 
  in 
  patches 
  

   on 
  the 
  under 
  surface 
  of 
  the 
  affected 
  leaf. 
  These 
  leaf-lice 
  are 
  oval 
  or 
  

   somewhat 
  egg-shaped, 
  their 
  bodies 
  are 
  soft, 
  their 
  legs 
  and 
  antennae 
  are 
  

   well 
  developed, 
  and 
  at 
  the 
  back 
  of 
  the 
  abdomen, 
  near 
  the 
  hinder 
  end 
  of 
  

   the 
  body, 
  a 
  pair 
  of 
  prominent 
  tubes 
  — 
  the 
  so-called 
  honey-tubes 
  — 
  pro- 
  

   jects 
  backwards 
  or 
  upwards 
  like 
  miniature 
  stove-pipes. 
  The 
  greater 
  

   part 
  of 
  them 
  are 
  without 
  wings, 
  but, 
  among 
  these, 
  winged 
  individuals 
  

   will 
  occasionally 
  occur, 
  with 
  large, 
  delicate, 
  few-veined 
  wings. 
  Ants 
  of 
  

   various 
  species 
  are 
  likely 
  to 
  be 
  found 
  with 
  and 
  among 
  them, 
  and, 
  indeed, 
  

   wherever 
  ants 
  are 
  abundant 
  on 
  or 
  about 
  the 
  beets, 
  the 
  presence 
  of 
  plant- 
  

   lice 
  may 
  always 
  reasonably 
  be 
  suspected. 
  They 
  do 
  their 
  injury 
  to 
  veg- 
  

   etation 
  by 
  sucking 
  the 
  sap 
  through 
  a 
  stiff, 
  jointed 
  beak 
  by 
  means 
  of 
  

   which 
  the 
  tissues 
  of 
  the 
  plant 
  are 
  pierced. 
  Three 
  species 
  have 
  hitherto 
  

   been 
  reported 
  on 
  the 
  beet 
  leaf 
  in 
  America, 
  and 
  to 
  these 
  three 
  more 
  are 
  

   added 
  in 
  this 
  paper. 
  

  

  We 
  have 
  not 
  yet 
  found 
  in 
  Illinois 
  any 
  plant-louse 
  species 
  infesting 
  

   the 
  leaf 
  of 
  the 
  sugar 
  beet 
  in 
  sufficient 
  numbers 
  to 
  do 
  appreciable 
  injury, 
  

  

  *Rep. 
  Comm. 
  Agr., 
  1886, 
  p. 
  577. 
  

  

  tTwo 
  additional 
  species 
  of 
  plant-lice 
  infesting 
  beets, 
  Aphis 
  initldlttonii 
  and 
  Pemphigus 
  betcE, 
  are 
  

   described 
  on 
  a 
  later 
  page 
  under 
  the 
  head 
  of 
  insects 
  affecting 
  the 
  roots 
  of 
  this 
  plant. 
  

  

  