﻿652 
  

  

  Citrus 
  trees 
  in 
  Ceylon 
  are 
  also 
  infested 
  by 
  a 
  species 
  of 
  Walkeriana, 
  

   which 
  encrusts 
  the 
  stem 
  and 
  branches, 
  but 
  this 
  scale 
  is 
  heavily 
  parasi- 
  

   tised 
  by 
  an 
  Agromyzid, 
  Cryptochaetum 
  curtipenne, 
  Knab, 
  and 
  a 
  colony 
  

   of 
  Walkeriana 
  was 
  also 
  observed 
  to 
  be 
  nearly 
  wiped 
  out 
  by 
  the 
  cater- 
  

   pillar 
  of 
  a 
  Pyralid. 
  Other 
  pests 
  of 
  citrus 
  in 
  Ceylon 
  include 
  Coccus 
  

   viridis, 
  Green, 
  Lepidosaphes 
  beckii, 
  Newm., 
  Apogonia 
  comosa, 
  Karsch, 
  

   and 
  Toxoptera 
  sp. 
  

  

  Electricity 
  for 
  Destruction 
  of 
  Green 
  Flies,— 
  Bolan. 
  Jl., 
  London, 
  iii, 
  

   no. 
  2, 
  July 
  1914, 
  pp. 
  35-36. 
  

  

  A 
  short 
  note 
  on 
  the 
  use 
  of 
  electricity 
  for 
  the 
  destruction 
  of 
  Aphididae 
  

   states 
  that 
  the 
  apparatus 
  used 
  consists 
  of 
  a 
  small 
  induction 
  coil, 
  run 
  

   by 
  dry 
  cells 
  and 
  a 
  small 
  Leyden 
  jar, 
  a 
  large 
  resonator 
  coil 
  being 
  con- 
  

   nected 
  up 
  with 
  it, 
  as 
  in 
  a 
  small 
  wireless 
  apparatus. 
  The 
  free 
  end 
  of 
  

   the 
  resonator 
  coil 
  is 
  connected 
  to 
  a 
  piece 
  of 
  flexible 
  wire 
  attached 
  to 
  

   an 
  ebonite 
  handle, 
  by 
  means 
  of 
  which 
  the 
  wire 
  can 
  be 
  held 
  near 
  the 
  

   rosebuds. 
  The 
  instant 
  this 
  is 
  done 
  sparks 
  fly 
  to 
  the 
  rosebud, 
  and, 
  when 
  

   properly 
  regulated, 
  kill 
  aphids 
  and 
  ants, 
  the 
  former 
  remaining 
  on 
  the 
  

   buds, 
  the 
  latter 
  dropping 
  off. 
  Too 
  strong 
  a 
  current 
  bleaches 
  the 
  roses, 
  

   and 
  the 
  present 
  objection 
  to 
  this 
  method 
  lies 
  in 
  the 
  fact 
  that 
  the 
  time 
  

   required 
  to 
  rid 
  one 
  plant 
  of 
  insects 
  in 
  this 
  way 
  would 
  be 
  about 
  

   equal 
  to 
  that 
  needed 
  to 
  spray 
  100 
  trees. 
  

  

  Froggatt 
  (W. 
  W.). 
  a 
  Descriptive 
  Catalogue 
  of 
  the 
  Scale-Insects 
  

   (Coccidae) 
  of 
  Australia. 
  — 
  Agric. 
  Gaz. 
  of 
  N,S.W., 
  Sydney, 
  xxv, 
  

   July 
  1914, 
  pp. 
  599-610, 
  2 
  pis. 
  

  

  Additional 
  Coccids 
  in 
  this 
  catalogue 
  [see 
  this 
  Review, 
  Ser. 
  A, 
  ii, 
  

   pp. 
  427-428] 
  are 
  : 
  — 
  Parlatoria 
  destructor, 
  Newst., 
  from 
  the 
  apple 
  ; 
  

   P. 
  proteus, 
  Curt., 
  from 
  Pinus 
  insignis 
  and 
  Citrus 
  ; 
  P. 
  pittospori, 
  Mask., 
  

   from 
  Pittosporum 
  undulatum 
  ; 
  P. 
  viridis, 
  Full., 
  from 
  Pittosporum 
  sp. 
  ; 
  

   P. 
  ziziphus, 
  Lucas, 
  from 
  Zizyphus 
  spinachristi 
  ; 
  Lepidosaphes 
  {Myti- 
  

   laspis) 
  auriculata. 
  Green, 
  from 
  Croton 
  ; 
  L. 
  beckii, 
  Newm. 
  (the 
  " 
  Purple 
  

   Scale 
  "), 
  from 
  Croton 
  and 
  Citrus 
  ; 
  and 
  one 
  new 
  species, 
  L. 
  eucalypti, 
  

   from 
  Eucalyptus 
  piperita. 
  

  

  Hardenberg 
  (B. 
  B.). 
  The 
  Aloe 
  gall.— 
  Agric. 
  Jl. 
  Union 
  S. 
  Africa, 
  

   Pretoria, 
  viii, 
  no. 
  1, 
  July 
  1914, 
  pp. 
  70-72, 
  1 
  fig. 
  

  

  Several 
  species 
  of 
  aloe 
  are 
  subject 
  to 
  the 
  attack 
  of 
  an 
  undetermined 
  

   mite 
  of 
  the 
  family 
  Eriophyidae, 
  which 
  causes 
  galls 
  on 
  the 
  leaves 
  and 
  

   flower-stems 
  and 
  which, 
  when 
  once 
  established, 
  spreads 
  very 
  quickly 
  

   and 
  may 
  affect 
  the 
  whole 
  plant 
  in 
  one 
  season. 
  On 
  the 
  flower-stems 
  

   the 
  galls 
  may 
  attain 
  the 
  size 
  of 
  a 
  walnut, 
  or 
  even 
  of 
  a 
  small 
  orange. 
  

   The 
  mites 
  swarm 
  in 
  countless 
  numbers 
  over 
  the 
  surface 
  and 
  in 
  the 
  

   crevices 
  of 
  the 
  gall, 
  and 
  in 
  May 
  could 
  be 
  found 
  in 
  all 
  stages 
  of 
  develop- 
  

   ment 
  from 
  egg 
  to 
  adult 
  ; 
  they 
  do 
  not 
  penetrate 
  the 
  tissues. 
  The 
  galls 
  

   reach 
  their 
  greatest 
  development 
  in 
  late 
  autumn 
  or 
  winter, 
  so 
  that 
  

   it 
  is 
  probable 
  that 
  the 
  heavy 
  rains 
  of 
  spring 
  and 
  summer 
  are 
  inimical 
  

   to 
  the 
  development 
  of 
  the 
  mite. 
  The 
  galls 
  have 
  been 
  observed 
  

   principally 
  on 
  Aloe 
  transvaalensis, 
  Kuntze, 
  but 
  other 
  species 
  are 
  also 
  

   attacked. 
  

  

  