﻿THE 
  BIONOMICS 
  OF 
  SOME 
  MALAYAN 
  ANOPHELINES. 
  

  

  135 
  

  

  The 
  average 
  number 
  of 
  ova 
  for 
  each 
  parent, 
  based 
  on 
  data 
  from 
  62, 
  works 
  out 
  at 
  

   38, 
  the 
  maximum 
  from 
  a 
  single 
  parent 
  having 
  been 
  117. 
  

  

  Description 
  of 
  the 
  ova 
  of 
  this 
  species 
  (fig. 
  1, 
  c) 
  :—" 
  Length 
  0-40 
  mm., 
  breadth 
  

   0T6 
  mm, 
  ; 
  the 
  upper 
  surface 
  is 
  extremely 
  narrow 
  and 
  the 
  frill 
  is 
  continuous 
  around 
  

   its 
  margin 
  " 
  (Stanton). 
  

  

  Anopheles 
  kochi. 
  

  

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

  

  April 
  

   1920. 
  

  

  May. 
  

  

  June. 
  

  

  July. 
  

  

  Aug. 
  

  

  Sept. 
  

  

  Oct. 
  

  

  Nov. 
  

  

  Dec. 
  

  

  Tan. 
  

   1921. 
  

  

  Feb. 
  

  

  March. 
  

  

  

  

  30 
  

  

  — 
  

  

  — 
  

  

  

  

  — 
  

  

  110 
  

  

  

  

  38 
  

  

  41 
  

  

  — 
  

  

  85 
  

  

  The 
  average 
  number 
  of 
  ova, 
  based 
  on 
  data 
  from 
  5 
  parents, 
  works 
  out 
  at 
  40, 
  the 
  

   maximum 
  number 
  from 
  1 
  parent 
  having 
  been 
  110. 
  

  

  Dr. 
  Stanton 
  thus 
  describes 
  the 
  egg 
  : 
  — 
  " 
  The 
  ovum 
  is 
  0-45 
  mm. 
  long 
  and 
  0-16 
  mm. 
  

   broad. 
  The 
  upper 
  surface 
  is 
  narrow, 
  and 
  the 
  floats 
  do 
  not 
  touch 
  its 
  margin 
  ; 
  the 
  

   narrow 
  striated 
  frill 
  is 
  continuous 
  around 
  the 
  whole 
  of 
  the 
  margin 
  of 
  the 
  upper 
  surface. 
  

   The 
  floats 
  are 
  oblong 
  in 
  shape 
  and 
  extend 
  over 
  the 
  middle 
  two-thirds 
  of 
  the 
  length 
  of 
  

   the 
  ovum 
  ; 
  each 
  float 
  has 
  about 
  20 
  corrugations. 
  The 
  thin 
  membrane 
  which 
  covers 
  

   the 
  whole 
  of 
  the 
  lower 
  surface 
  of 
  the 
  ovum 
  and 
  part 
  of 
  its 
  upper 
  surface 
  has 
  a 
  

   reticulated 
  pattern." 
  

  

  Anopheles 
  fuliginosus. 
  

  

  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. 
  

  

  

  

  73 
  

   28 
  

  

  61 
  

  

  — 
  

  

  — 
  

  

  95 
  

   79 
  

  

  

  

  

  

  , 
  

  

  31 
  

   53 
  

   38 
  

  

  46 
  

  

  66 
  

  

  75 
  

  

  The 
  average 
  number 
  of 
  ova, 
  based 
  on 
  data 
  from 
  11 
  parents, 
  works 
  out 
  at 
  58, 
  

   the 
  maximum 
  from 
  a 
  single 
  parent 
  having 
  been 
  95. 
  

  

  Dr. 
  Stanton 
  thus 
  describes 
  the 
  ovum 
  (fig. 
  1, 
  d) 
  : 
  — 
  " 
  Length 
  0-56 
  mm., 
  breadth 
  

   0-20 
  mm. 
  Frill 
  not 
  continuous 
  ; 
  it 
  is 
  broad 
  until 
  it 
  meets 
  the 
  floats, 
  where 
  it 
  becomes 
  

   narrow 
  and 
  is 
  interrupted. 
  Each 
  float 
  has 
  20 
  corrugations 
  and 
  covers 
  the 
  middle 
  half 
  

   of 
  the 
  length 
  of 
  the 
  ovum. 
  The 
  upper 
  surface 
  is 
  broad 
  ; 
  the 
  lower 
  surface 
  is 
  covered 
  

   by 
  a 
  membrane 
  which 
  is 
  without 
  pattern." 
  

  

  Anopheles 
  tessellatus. 
  

  

  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. 
  

  

  ■ 
  

  

  33 
  

  

  — 
  

  

  

  

  — 
  

  

  ■ 
  — 
  

  

  49 
  

   28 
  

   28 
  

   15 
  

  

  20 
  

   38 
  

  

  25 
  

  

  

  

  

  

  ■ 
  — 
  

  

  