﻿THE 
  BIONOMICS 
  OF 
  SOME 
  MALAYAN 
  ANOPHELINES. 
  

  

  133 
  

  

  The 
  maximum 
  number 
  of 
  ova 
  obtained 
  from 
  a 
  single 
  parent 
  was 
  300, 
  and 
  the 
  

   average, 
  based 
  on 
  the 
  data 
  from 
  32 
  parents, 
  works 
  out 
  at 
  63. 
  The 
  following 
  is 
  a 
  

   description 
  of 
  the 
  ovum 
  (fig. 
  1, 
  b) 
  : 
  — 
  " 
  The 
  ovum 
  is 
  0-46 
  mm. 
  long 
  and 
  0-14 
  mm. 
  

   broad. 
  The 
  upper 
  surface 
  is 
  broad, 
  and 
  the 
  floats 
  touch 
  the 
  margin 
  ; 
  the 
  narrow 
  

   striated 
  frill 
  around 
  the 
  margin 
  of 
  the 
  upper 
  surface 
  is 
  interrupted 
  by 
  the 
  floats 
  " 
  

   (Stanton) 
  . 
  

  

  Anopheles 
  karwari. 
  

  

  The 
  months 
  of 
  oviposition 
  and 
  the 
  number 
  of 
  ova 
  secured 
  were 
  : 
  — 
  

  

  April 
  

   1920. 
  

  

  May. 
  

  

  June. 
  

  

  July. 
  

  

  Aug. 
  

  

  Sept. 
  

  

  Oct. 
  

  

  Nov. 
  

  

  Dec. 
  

  

  Jan. 
  

   1921. 
  

  

  Feb. 
  

  

  March. 
  

  

  

  

  10 
  

  

  54 
  

  

  — 
  

  

  

  

  

  51 
  

  

  

  

  97 
  

  

  

  

  

  

  

  

  The 
  maximum 
  number 
  of 
  ova 
  obtained 
  from 
  a 
  single 
  parent, 
  therefore, 
  was 
  97, 
  

   and 
  the 
  average, 
  based 
  on 
  the 
  data 
  from 
  4, 
  works 
  out 
  at 
  53. 
  

   The 
  ovum 
  is 
  precisely 
  similar 
  to 
  that 
  of 
  A. 
  maculatus. 
  

  

  A 
  nopJieles 
  vagus. 
  

  

  The 
  months 
  of 
  oviposition 
  and 
  the 
  number 
  of 
  ova 
  secured 
  were 
  : 
  — 
  

  

  April 
  

   1920. 
  

  

  May. 
  

  

  June. 
  

  

  July. 
  

  

  Aug. 
  

  

  Sept. 
  

  

  Oct. 
  

  

  Nov. 
  

  

  Dec. 
  

  

  Jan. 
  

   1921. 
  

  

  Feb. 
  

  

  March. 
  

  

  80 
  

   63 
  

  

  26 
  

   42 
  

   45 
  

   30 
  

   29 
  

   25 
  

  

  126 
  

   56 
  

   63 
  

  

  152 
  

  

  • 
  

  

  26 
  

  

  69 
  

  

  9 
  

  

  138 
  

  

  106 
  

  

  20 
  

   13S 
  

   110 
  

  

  20 
  

   S 
  

  

  69 
  

  

  92 
  

  

  75 
  

  

  66 
  

  

  67 
  

  

  172 
  

  

  248 
  

  

  32 
  

  

  86 
  

  

  28 
  

  

  21 
  

  

  170 
  

  

  144 
  

  

  34 
  

  

  142 
  

  

  61 
  

  

  143 
  

  

  13 
  

  

  36 
  

  

  27 
  

  

  156 
  

  

  66 
  

  

  5 
  

  

  143 
  

  

  156 
  

  

  5 
  

  

  5 
  

  

  62 
  

  

  31 
  

  

  109 
  

  

  112 
  

  

  132 
  

  

  87 
  

  

  51 
  

  

  58 
  

  

  34 
  

  

  184 
  

  

  98 
  

  

  172 
  

  

  151 
  

  

  42 
  

  

  223 
  

  

  56 
  

  

  82 
  

  

  166 
  

  

  211 
  

  

  90 
  

  

  173 
  

  

  211 
  

  

  86 
  

  

  14 
  

  

  127 
  

  

  188 
  

  

  50 
  

  

  51 
  

  

  196 
  

  

  73 
  

  

  155 
  

  

  134 
  

  

  149 
  

  

  75 
  

  

  25 
  

  

  171 
  

  

  167 
  

  

  146 
  

  

  14S 
  

  

  96 
  

  

  56 
  

  

  135 
  

  

  121 
  

  

  170 
  

  

  5 
  

  

  35 
  

  

  72 
  

  

  114 
  

  

  146 
  

  

  98 
  

   78 
  

   35 
  

   59 
  

  

  131 
  

   115 
  

  

  163 
  

  

  109 
  

   20 
  

  

  176 
  

   45 
  

   60 
  

   95 
  

  

  126 
  

   48 
  

  

  100 
  

  

  The 
  maximum 
  number 
  of 
  ova 
  obtained 
  from 
  a 
  single 
  parent 
  was 
  273, 
  and 
  the 
  

   average 
  number, 
  based 
  on 
  the 
  data 
  obtained 
  from 
  114, 
  works 
  out 
  at 
  89. 
  

  

  Dr. 
  Stanton 
  thus 
  describes 
  the 
  ovum 
  of 
  this 
  species 
  : 
  — 
  " 
  Length 
  0-54 
  mm., 
  

   breadth 
  0-20 
  mm. 
  The 
  upper 
  surface 
  is 
  broad 
  and 
  the 
  frill 
  continuous 
  around 
  the 
  

   whole 
  of 
  its 
  margin 
  ; 
  the 
  floats, 
  which 
  are 
  oblong, 
  do 
  not 
  quite 
  touch 
  the 
  margin 
  and 
  

   occupy 
  three-fifths 
  of 
  the 
  length 
  of 
  the 
  ovum 
  ; 
  the 
  corrugations 
  number 
  25 
  ; 
  the 
  

   membrane 
  covering 
  the 
  lower 
  surface 
  is 
  reticulated." 
  

  

  