﻿— 
  115 
  — 
  

  

  The 
  leaf-beetles 
  which 
  do 
  not 
  have 
  the 
  leaping 
  habit 
  are 
  fewer 
  in 
  

   number 
  and 
  much 
  more 
  readily 
  discriminated. 
  The 
  two 
  " 
  French 
  bugs" 
  

   {Monoxia), 
  not 
  found 
  in 
  Illinois, 
  are 
  either 
  pale 
  yellowish 
  with 
  indefinite 
  

   spots 
  {M. 
  consputd) 
  or 
  uniform 
  in 
  color 
  but 
  varying 
  from 
  yellow 
  to 
  black, 
  

   rarely 
  with 
  a 
  more 
  or 
  less 
  distinct 
  pair 
  of 
  dark 
  stripes 
  on 
  the 
  wing-covers 
  

   (J/, 
  puncticollis'). 
  The 
  beetle 
  of 
  the 
  northern 
  corn 
  root 
  worm 
  {Diabroiica 
  

   longicornis 
  — 
  Fig. 
  49) 
  is 
  uniform 
  green; 
  that 
  of 
  the 
  southern 
  corn 
  root 
  

   worm 
  (Z). 
  i2-punciata 
  — 
  Fig. 
  45), 
  generally 
  yellow 
  with 
  three 
  cross 
  

   rows 
  of 
  black 
  dots 
  on 
  the 
  wing-covers, 
  four 
  in 
  each 
  row. 
  The 
  common 
  

   cucumber 
  beetle 
  (Z?. 
  vittata 
  — 
  Fig. 
  46 
  a) 
  is 
  striped 
  with 
  black 
  and 
  yellow; 
  

   and 
  the 
  grape-vine 
  Colaspis 
  (C 
  brunnea 
  — 
  PI. 
  IX., 
  Fig. 
  i) 
  is 
  a 
  thick 
  

   clay-yellowish 
  beetle 
  about 
  an 
  eighth 
  of 
  an 
  inch 
  long, 
  with 
  cylindrical 
  

   thorax 
  only 
  about 
  half 
  as 
  wide 
  as 
  the 
  body 
  across 
  the 
  prominent 
  

   shoulders. 
  

  

  The 
  Larger 
  Striped-Flea-beetle. 
  

   Disonycha 
  crejiicollis 
  Say. 
  

  

  This 
  rather 
  large 
  flea-beetle, 
  about 
  a 
  quarter 
  of 
  an 
  inch 
  in 
  length, 
  

   striped 
  with 
  pale 
  yellow 
  and 
  black 
  and 
  with 
  a 
  pair 
  of 
  black 
  dots 
  near 
  

   the 
  middle 
  of 
  the 
  yellow 
  thorax, 
  has 
  been 
  occasionally 
  found 
  by 
  us 
  in 
  

   the 
  beet 
  fields 
  of 
  Illinois 
  in 
  summer 
  and 
  fall, 
  and 
  has 
  also 
  been 
  seen 
  on 
  

   beets 
  in 
  Nebraska. 
  It 
  ranges 
  from 
  New 
  York 
  and 
  Iowa 
  to 
  Texas 
  and 
  

   Mexico. 
  Its 
  larval 
  habits 
  are 
  not 
  known, 
  but 
  those 
  of 
  related 
  species 
  

   feed 
  exposed 
  upon 
  the 
  leaves 
  of 
  beets 
  and 
  other 
  plants. 
  This 
  beetle 
  also 
  

   injures 
  strawberry 
  leaves, 
  and 
  it 
  is 
  one 
  of 
  the 
  common 
  melon 
  beetles 
  of 
  

   southern 
  Illinois. 
  It 
  hibernates 
  as 
  an 
  adult, 
  but 
  the 
  number 
  of 
  its 
  suc- 
  

   cessive 
  broods 
  has 
  never 
  been 
  determined. 
  

  

  The 
  Three-Spotted 
  Flea-beetle. 
  

  

  Disonycha 
  triangularis 
  Say. 
  

  

  (El. 
  IV., 
  Fig. 
  2.) 
  

  

  This 
  beetle 
  is 
  black 
  except 
  the 
  thorax, 
  which 
  is 
  pale 
  yellowish 
  

   above 
  and 
  bears 
  three 
  small 
  dots 
  arranged 
  as 
  a 
  triangle, 
  the 
  middle 
  one 
  

   of 
  the 
  three 
  usually 
  very 
  small. 
  It 
  feeds 
  commonly 
  on 
  leaves 
  of 
  the 
  

   sugar 
  beet 
  in 
  Illinois, 
  on 
  lamb's-quarters, 
  apparently 
  its 
  favorite 
  food, 
  

   and 
  also 
  on 
  the 
  spiny 
  pigweed 
  {Amaranti/s^. 
  It 
  is 
  found 
  throughout 
  

   the 
  United 
  States 
  and 
  Canada. 
  It 
  hibernates 
  as 
  an 
  adult, 
  occurring 
  

   not 
  uncommonly 
  in 
  our 
  January 
  collections. 
  We 
  have 
  taken 
  it 
  fre- 
  

   quently 
  in 
  July, 
  and 
  occasionally 
  also 
  in 
  late 
  August 
  and 
  early 
  fall. 
  Its 
  

   life 
  history 
  is 
  not 
  known 
  except'by 
  analogy 
  with 
  that 
  of 
  the 
  following 
  

   species. 
  It 
  occurs 
  throughout 
  the 
  United 
  States 
  east 
  of 
  the 
  Rocky 
  

   Mountains 
  and 
  in 
  Canada. 
  

  

  