﻿12 
  

  

  \V. 
  A. 
  I.AMBORX. 
  

  

  for 
  the 
  purpose, 
  and 
  it 
  was 
  used 
  for 
  rearing 
  for 
  the 
  study 
  of 
  variation 
  and 
  other 
  pur- 
  

   poses 
  large 
  families 
  of 
  these 
  mosquitos 
  from 
  known 
  female 
  parents. 
  The 
  results 
  will 
  

   be 
  presented 
  in 
  another 
  paper 
  ; 
  for 
  the 
  purpose 
  of 
  the 
  present 
  one 
  it 
  will 
  suffice 
  to 
  

   give 
  a 
  few 
  of 
  the 
  data 
  obtained. 
  These 
  are 
  given 
  in 
  the 
  following 
  Table 
  III. 
  

  

  TABLE 
  111. 
  

  

  Species. 
  

  

  Number 
  

   of 
  ova. 
  

  

  Number 
  of 
  adults 
  obtained. 
  

  

  Males. 
  

  

  Females. 
  

  

  Totals. 
  

  

  A 
  . 
  aconitus 
  

  

  A 
  . 
  barbirostris 
  

  

  A 
  . 
  hyrcanus 
  

  

  A 
  . 
  maculatus 
  

  

  A 
  . 
  karwari 
  

  

  A 
  . 
  subpictus 
  var. 
  malayensis 
  

  

  A 
  . 
  vagus 
  

  

  A 
  . 
  ludlowi 
  

  

  A 
  . 
  fuliginosus 
  

  

  A. 
  kochi 
  

  

  A 
  . 
  tessellatus 
  

  

  176 
  

   91 
  

   98 
  

  

  115 
  

   75 
  

  

  117 
  

   30 
  

   68 
  

   97 
  

   88 
  

   97 
  

  

  146 
  

   72 
  

  

  120 
  

   50 
  

   46 
  

   75 
  

  

  110 
  

   82 
  

   38 
  

  

  47 
  

   30 
  

   30 
  

   39 
  

   42 
  

   41 
  

   9 
  

   17 
  

   20 
  

   37 
  

   32 
  

   42 
  

   23 
  

   14 
  

   14 
  

   22 
  

   16 
  

   31 
  

   20 
  

   10 
  

  

  35 
  

   31 
  

   14 
  

   30 
  

   31 
  

   40 
  

   17 
  

   15 
  

   27 
  

   20 
  

   29 
  

   33 
  

   23 
  

   22 
  

  

  6 
  

   18 
  

   18 
  

   53 
  

   18 
  

  

  3 
  

  

  82 
  

   61 
  

   44 
  

   69 
  

   73 
  

   81 
  

   26 
  

   32 
  

   47 
  

   57 
  

   61 
  

   75 
  

   46 
  

   36 
  

   20 
  

   40 
  

   24 
  

   84 
  

   38 
  

   13 
  

  

  The 
  surprising 
  fact 
  arises, 
  then, 
  that 
  all 
  the 
  common 
  Anophelines 
  could 
  be 
  bred 
  

   from 
  the 
  egg 
  in 
  a 
  medium 
  in 
  which 
  none 
  except 
  A. 
  vagus 
  existed 
  in 
  nature. 
  A 
  still 
  

   more 
  surprising 
  result 
  was 
  that 
  any 
  success 
  at 
  all 
  was 
  met 
  with 
  in 
  the 
  case 
  of 
  A 
  . 
  ludlowi, 
  

   a 
  species 
  limited 
  in 
  the 
  Federated 
  Malay 
  States 
  (though 
  not 
  in 
  Java) 
  to 
  the 
  coastal 
  

   area, 
  by 
  reason 
  of 
  its 
  preference 
  for 
  brackish 
  pools 
  as 
  breeding-places. 
  The 
  case 
  is 
  

   the 
  more 
  interesting 
  by 
  reason 
  of 
  the 
  observation 
  made 
  by 
  Dr. 
  Hacker, 
  that 
  when 
  

   the 
  salinity 
  of 
  breeding-places 
  favoured 
  by 
  this 
  species 
  becomes 
  diminished 
  owing 
  to 
  

   rainfall 
  the 
  larvae 
  are 
  no 
  longer 
  found, 
  but 
  may 
  be 
  replaced 
  by 
  those 
  of 
  A. 
  vagus* 
  

   All 
  the 
  results 
  were 
  not 
  uniform, 
  however. 
  It 
  was 
  found, 
  especially 
  with 
  A. 
  aconitus, 
  

   that 
  unless 
  the 
  water 
  was 
  changed 
  daily, 
  the 
  larvae 
  soon 
  died 
  out 
  (neglect 
  to 
  change 
  

   it 
  on 
  a 
  Sunday 
  caused 
  the 
  death 
  of 
  several 
  broods), 
  and 
  that 
  other 
  larvae, 
  especially 
  

   A. 
  maculatus 
  and 
  A. 
  vagus, 
  though 
  less 
  prejudicially 
  affected, 
  often 
  maintained 
  them- 
  

   selves 
  in 
  such 
  water 
  unchanged 
  for 
  several 
  days. 
  On 
  one 
  occasion 
  a 
  number 
  of 
  larvae 
  

   of 
  A. 
  aconitus, 
  comprising 
  two 
  families 
  and 
  numbering 
  108, 
  had 
  thrived 
  to 
  such 
  a 
  

   degree 
  in 
  this 
  Zswg/etttf-containing 
  water 
  that 
  their 
  pupation 
  was 
  expected 
  within 
  a 
  day 
  

   or 
  two. 
  On 
  transfer 
  of 
  the 
  larvae 
  one 
  morning 
  to 
  fresh 
  bowls 
  of 
  water 
  it 
  was 
  noticed 
  

   that 
  fetor 
  was 
  arising 
  from 
  it 
  and, 
  as 
  it 
  had 
  already 
  been 
  appreciated 
  that 
  these 
  larvae 
  

   are 
  more 
  delicate 
  than 
  others, 
  some 
  misgiving 
  was 
  felt 
  as 
  to 
  them. 
  These 
  fears 
  were 
  

   soon 
  realised 
  ; 
  the 
  larvae 
  ceased 
  to 
  feed 
  continuously, 
  the 
  mouth-brushes 
  working 
  

   intermittently 
  only, 
  and 
  within 
  36 
  hours 
  the 
  whole 
  of 
  both 
  families 
  had 
  perished, 
  

   the 
  larvae 
  of 
  the 
  other 
  species 
  changed 
  into 
  similar 
  water 
  being 
  apparently 
  unin- 
  

   fluenced. 
  It 
  was 
  to 
  be 
  expected 
  that 
  the 
  larvae 
  of 
  this 
  species 
  would 
  succumb 
  in 
  any 
  

   foul 
  water. 
  To 
  test 
  this, 
  about 
  half 
  of 
  a 
  batch 
  of 
  59 
  ova 
  were 
  placed 
  on 
  9th 
  

  

  * 
  F.M.S. 
  Malaria 
  Bureau 
  Reports, 
  ii. 
  p. 
  38. 
  

  

  