﻿104 
  

  

  The 
  scale-insect 
  {Aspidiotus 
  aonidum, 
  L.), 
  which 
  does 
  the 
  damage 
  

   ill 
  Egypt, 
  is 
  a 
  recent 
  introduction, 
  and 
  the 
  depreciation 
  it 
  causes 
  may 
  

   be 
  50 
  or 
  60 
  per 
  cent. 
  The 
  improvement 
  due 
  to 
  fumigation 
  pays 
  for 
  

   itself 
  in 
  the 
  first 
  season 
  and 
  leaves 
  an 
  additional 
  profit 
  over 
  and 
  above 
  

   last 
  year's 
  takings. 
  

  

  Williams 
  (C. 
  B.). 
  On 
  two 
  new 
  species 
  of 
  Thysanoptera 
  from 
  the 
  

   West 
  Indies. 
  — 
  Jl. 
  Econ. 
  Biol, 
  London, 
  viii, 
  no. 
  4, 
  16th 
  Dec. 
  1913, 
  

   pp. 
  209-215, 
  2 
  figs. 
  

  

  Two 
  collections 
  of 
  Thrips 
  were 
  received 
  by 
  the 
  author 
  from 
  Mr. 
  F. 
  

   Birkinshaw, 
  of 
  the 
  Agricultural 
  Experiment 
  Station, 
  Kingstown, 
  

   St. 
  Vincent. 
  The 
  insects 
  had 
  been 
  taken 
  in 
  the 
  grounds 
  of 
  that 
  station 
  

   on 
  cacao 
  and 
  bitter 
  cassava 
  {Manihot 
  utilissima). 
  It 
  was 
  stated 
  that 
  

   the 
  manihot 
  leaves 
  were 
  injured 
  somewhat 
  and 
  consequently 
  did 
  not 
  

   develop 
  properly 
  ; 
  the 
  insects 
  however, 
  did 
  not 
  appear 
  to 
  be 
  a 
  

   source 
  of 
  great 
  injury 
  so 
  far 
  as 
  the 
  yield 
  is 
  concerned, 
  unless 
  it 
  was 
  

   present 
  in 
  large 
  numbers. 
  The 
  collection 
  of 
  insects 
  taken 
  on 
  cacao 
  

   consisted 
  entirely 
  of 
  larvae 
  and 
  adults 
  of 
  Heliothrips 
  ruhrocincta, 
  

   Giard 
  ; 
  that 
  from 
  cassava 
  contained 
  two 
  species, 
  both 
  of 
  which 
  

   appear 
  to 
  be 
  new. 
  One 
  belongs 
  to 
  the 
  genus 
  Frankliniella, 
  and 
  has 
  

   been 
  called 
  F. 
  melanommatus 
  ; 
  for 
  the 
  other 
  it 
  has 
  been 
  found 
  necessary 
  

   to 
  erect 
  a 
  new 
  genus 
  of 
  the 
  family 
  Thkipidae, 
  and 
  the 
  name 
  Cory- 
  

   nothrips 
  stenopterus 
  is 
  proposed 
  for 
  it. 
  

  

  Thompson 
  (W. 
  E.). 
  La 
  Specificity 
  des 
  Parasites 
  entomophages. 
  

  

  [Specialisation 
  of 
  habit 
  in 
  Parasites 
  of 
  Insects.] 
  — 
  C. 
  R. 
  de 
  la 
  Soc. 
  

   Biol, 
  Ixxv, 
  no. 
  36, 
  19th 
  Dec. 
  1913, 
  pp. 
  559-560. 
  

  

  In 
  a 
  second 
  communication 
  upon 
  this 
  subject 
  [see 
  this 
  Review, 
  

   Ser. 
  A, 
  ii, 
  p. 
  16], 
  the 
  author 
  describes 
  experiments 
  he 
  made 
  with 
  the 
  

   Tachinid 
  parasite 
  Sturmia 
  scutellata, 
  R.D., 
  supplied 
  with 
  eggs 
  of 
  

   Lymantria 
  dispar, 
  Clisiocampa 
  disstria, 
  C. 
  americana, 
  Vanessa 
  antiopa, 
  

   Hemerocampa 
  leucostigma, 
  and 
  Orgyia 
  antiqua. 
  In 
  the 
  first 
  three 
  

   the 
  parasites 
  developed 
  normally 
  ; 
  they 
  did 
  not 
  develop 
  at 
  all 
  

   in 
  Vanessa. 
  In 
  the 
  last 
  two, 
  although 
  the 
  eggs 
  were 
  given 
  in 
  large 
  

   numbers, 
  not 
  a 
  single 
  perfect 
  larva 
  was 
  obtained 
  ; 
  upon 
  dissection, 
  

   44 
  larvae 
  of 
  the 
  parasite 
  were 
  found, 
  but 
  of 
  these 
  only 
  one 
  had 
  

   grown, 
  and 
  instead 
  of 
  being 
  as 
  usual 
  in 
  the 
  muscles 
  of 
  the 
  host 
  

   larva, 
  they 
  were 
  free 
  in 
  the 
  general 
  body 
  cavity, 
  and 
  were 
  much 
  

   smaller 
  than 
  is 
  usual 
  with 
  larvae 
  at 
  that 
  age. 
  Besides 
  these, 
  42 
  larvae 
  

   were 
  found 
  dead 
  and 
  decomposing 
  and 
  surrounded 
  by 
  phagocytes. 
  

  

  It 
  is 
  evident 
  that 
  Sturmia 
  scutellata 
  cannot 
  live 
  and 
  develop 
  in 
  

   surroundings 
  other 
  than 
  those 
  furnished 
  by 
  such 
  hosts 
  as 
  L. 
  dispar 
  

   or 
  C. 
  disstria 
  and 
  americana. 
  L. 
  dispar 
  belongs 
  to 
  the 
  Lymantriidae, 
  

   whereas 
  C. 
  disstria 
  and 
  C. 
  americana 
  belong 
  to 
  the 
  Lasiocampidae 
  ; 
  

   there 
  is 
  not, 
  therefore, 
  necessarily 
  any 
  relation 
  between 
  the 
  taxonomic 
  

   position 
  of 
  Lepidoptera 
  and 
  their 
  special 
  parasites. 
  On 
  the 
  other 
  hand, 
  

   different 
  parasites 
  can 
  often 
  live 
  in 
  a 
  limited 
  number 
  of 
  hosts 
  under 
  

   the 
  action 
  of 
  certain 
  ethological 
  factors 
  that 
  are 
  at 
  present 
  difficult 
  to 
  

   determine. 
  

  

  