﻿EXPLANATION 
  OF 
  PLATE 
  LXVIII. 
  

  

  Fig. 
  1. 
  Grape 
  Phylloxera.— 
  a, 
  shows 
  a 
  healthy 
  root 
  ; 
  h, 
  one 
  in 
  which 
  the 
  lice 
  ai« 
  

   working, 
  representing 
  the 
  knots 
  and 
  swellings 
  caused 
  by 
  their 
  punctures 
  : 
  c 
  a 
  root 
  

   that 
  has 
  been 
  deserted 
  by 
  them, 
  and 
  where 
  the 
  rootlets 
  have 
  commenced 
  to 
  decay 
  ; 
  

   d, 
  d, 
  d, 
  shows 
  how 
  the 
  lice 
  are 
  found 
  on 
  the 
  larger 
  roots 
  ; 
  e, 
  female 
  pupa, 
  dorsal 
  view: 
  

   /, 
  the 
  same, 
  ventral 
  view 
  ; 
  g, 
  winged 
  female, 
  dorsal 
  view 
  ; 
  h, 
  same, 
  ventral 
  view 
  ; 
  i 
  

   magnified 
  antenna 
  of 
  winged 
  insect 
  ; 
  j, 
  side 
  view 
  of 
  the 
  wingless 
  female 
  laying 
  eo-crs 
  

   on 
  roots; 
  k, 
  shows 
  how 
  the 
  punctures 
  of 
  the 
  lice 
  cause 
  the 
  larger 
  roots 
  to 
  decav!— 
  

   (After 
  Riley.) 
  ^ 
  

  

  Fig. 
  2. 
  Sexual 
  Phylloxerse.— 
  a, 
  female 
  vastatrix, 
  ventral 
  view, 
  showing 
  the 
  eo-g 
  through 
  

   the 
  transparent 
  skin 
  of 
  the 
  body; 
  &, 
  dorsal 
  view 
  of 
  the 
  same; 
  c, 
  tarsus, 
  greatly 
  en- 
  

   larged 
  ; 
  d, 
  shrunken 
  anal 
  joints 
  as 
  they 
  appear 
  after 
  oviposition 
  ; 
  e, 
  male 
  canjeecaulis, 
  

   dorsal 
  view; 
  the 
  dot 
  in 
  the 
  circles 
  indicates 
  the 
  natural 
  size 
  of 
  the 
  insect 
  — 
  (Alter 
  

   Kiley.) 
  ^ 
  

  

  