﻿ANOPHELINE 
  MOSQUITOS 
  IN 
  BRITISH 
  NORTH 
  BORNEO. 
  147 
  

  

  As 
  this 
  mosquito 
  was 
  so 
  plentiful, 
  an 
  opportunity 
  was 
  taken 
  of 
  studying 
  the 
  

   variability 
  of 
  the 
  species. 
  In 
  this 
  way 
  79 
  specimens 
  were 
  examined. 
  The 
  varia- 
  

   tions 
  were 
  most 
  marked 
  with 
  regard 
  to 
  size 
  of 
  the 
  insect 
  and 
  spotting 
  of 
  the 
  wings. 
  

  

  Three 
  distinct 
  sizes 
  could 
  be 
  made 
  out, 
  a 
  small, 
  intermediate 
  and 
  large 
  ; 
  the 
  smallest 
  

   measured 
  3*75 
  mm. 
  and 
  the 
  largest 
  55 
  mm. 
  Except 
  for 
  the 
  markings 
  on 
  the 
  wings 
  

   of 
  the 
  largest 
  variety 
  (referred 
  to 
  later), 
  there 
  was 
  no 
  noticeable 
  difference 
  between 
  

   these 
  varieties. 
  

  

  From 
  the 
  table 
  shown 
  below 
  it 
  will 
  be 
  seen 
  that 
  65*8 
  per 
  cent, 
  showed 
  two 
  costal 
  

   spots 
  on 
  the 
  wings, 
  although 
  in 
  17 
  of 
  these 
  the 
  middle 
  spot 
  was 
  faint. 
  In 
  only 
  11, 
  

   or 
  13*9 
  per 
  cent., 
  was 
  there 
  a 
  single 
  spot 
  at 
  the 
  end 
  of 
  the 
  wing. 
  The 
  fringe 
  spot 
  is 
  

   most 
  commonly 
  found 
  at 
  the 
  end 
  of 
  the 
  third 
  longitudinal 
  vein, 
  namely 
  in 
  88' 
  8 
  per 
  

   cent. 
  Not 
  only 
  is 
  the 
  variation 
  noticeable 
  in 
  different 
  specimens, 
  but 
  also 
  in 
  the 
  two 
  

   wings 
  of 
  the 
  same 
  specimen. 
  In 
  the 
  case 
  of 
  the 
  largest 
  variety 
  the 
  end 
  spot 
  is 
  much 
  

   larger 
  and 
  is 
  divided 
  into 
  two 
  by 
  a 
  few 
  dark 
  scales. 
  

  

  The 
  most 
  constant 
  characters 
  of 
  the 
  wings 
  are 
  therefore 
  : 
  — 
  Wings 
  with 
  two 
  costal 
  

   spots, 
  one 
  in 
  the 
  middle 
  of 
  the 
  costa 
  and 
  one 
  at 
  the 
  end 
  of 
  the 
  costa 
  ; 
  one 
  fringe 
  spot 
  

   opposite 
  the 
  third 
  longitudinal 
  vein. 
  

  

  Table 
  showing 
  variability 
  of 
  wing 
  spots 
  of 
  Anopheles 
  umbrosus. 
  

   Costal 
  Spots 
  (No. 
  examined, 
  79). 
  

  

  With 
  two 
  costal 
  spots 
  well 
  marked 
  in 
  both 
  wings 
  . 
  . 
  . 
  . 
  . 
  . 
  35 
  

  

  With 
  end 
  spot 
  present 
  in 
  both 
  wings 
  and 
  middle 
  spot 
  faint 
  in 
  both 
  17 
  

  

  With 
  end 
  spot 
  and 
  no 
  middle 
  spot 
  in 
  both 
  wings 
  . 
  . 
  . 
  . 
  . 
  . 
  11 
  

  

  With 
  end 
  spot 
  present 
  in 
  both 
  and 
  middle 
  spot 
  present 
  in 
  one 
  wing 
  

  

  and 
  absent 
  in 
  the 
  other 
  . 
  . 
  . 
  . 
  . 
  . 
  . 
  . 
  . 
  . 
  . 
  . 
  8 
  

  

  With 
  end 
  spot 
  present 
  in 
  both, 
  and 
  middle 
  spot 
  faint 
  in 
  one 
  wing 
  

  

  and 
  absent 
  in 
  the 
  other 
  . 
  . 
  . 
  . 
  . 
  . 
  . 
  . 
  . 
  . 
  . 
  . 
  5 
  

  

  With 
  end 
  spot 
  present 
  in 
  both, 
  and 
  middle 
  spot 
  marked 
  in 
  one 
  wing 
  

  

  and 
  faint 
  in 
  the 
  other 
  . 
  . 
  . 
  . 
  . 
  . 
  . 
  . 
  . 
  . 
  . 
  . 
  3 
  

  

  Fringe 
  Spot 
  (No. 
  examined, 
  72). 
  

  

  With 
  spot 
  opposite 
  third 
  longitudinal 
  vein 
  . 
  . 
  . 
  . 
  . 
  . 
  . 
  . 
  64 
  

  

  With 
  spot 
  opposite 
  lower 
  branch 
  of 
  second 
  longitudinal 
  vein 
  . 
  . 
  4 
  

   With 
  spot 
  between 
  lower 
  branch 
  of 
  second 
  longitudinal 
  vein 
  and 
  

  

  third 
  longitudinal 
  vein 
  . 
  . 
  . 
  . 
  . 
  . 
  . 
  . 
  . 
  . 
  . 
  . 
  4 
  

  

  Anopheles 
  albotaeniatus, 
  Theo. 
  

  

  Myzorhynchus 
  albotaeniatus, 
  Theobald, 
  op. 
  cit., 
  iii, 
  p. 
  88, 
  1903. 
  

  

  Only 
  three 
  specimens 
  of 
  this 
  species 
  were 
  found, 
  all 
  of 
  which 
  correspond 
  with 
  

   Theobald's 
  description. 
  One 
  was 
  taken 
  in 
  1912 
  and 
  the 
  two 
  others 
  in 
  April 
  1913. 
  

   They 
  were 
  all 
  females 
  and 
  were 
  captured 
  in 
  the 
  estate 
  (A) 
  hospital. 
  No 
  larvae 
  were 
  

   obtained. 
  

  

  In 
  conclusion, 
  I 
  wish 
  to 
  acknowledge 
  my 
  indebtedness 
  to 
  Lt.-Colonel 
  A. 
  Alcock, 
  

   F.R.S., 
  C.I.E., 
  for 
  much 
  valuable 
  advice 
  and 
  assistance 
  in 
  the 
  preparation 
  of 
  this 
  

   paper 
  and 
  to 
  the 
  authorities 
  of 
  the 
  British 
  Museum 
  for 
  allowing 
  me 
  to 
  examine 
  the 
  

   specimens 
  in 
  the 
  national 
  collection. 
  

  

  (C53) 
  d2 
  

  

  