﻿146 
  BICHAJtP 
  BOPEB— 
  ACCOUNT 
  OF 
  

  

  Anopheles 
  barbirostris, 
  Wulp. 
  

  

  Myzorkynchus 
  barbirostris, 
  van 
  der 
  Wulp, 
  Theobald, 
  op. 
  ciL, 
  iii, 
  p. 
  86, 
  1903. 
  

  

  The 
  specimens 
  taken 
  in 
  Borneo 
  correspond 
  with 
  Theobald's 
  quotation 
  (op. 
  cit. 
  i, 
  

   p. 
  146) 
  of 
  van 
  der 
  Wulp's 
  description. 
  The 
  white 
  scales 
  described 
  by 
  Stanton 
  

   (Journ. 
  London 
  School 
  Trop. 
  Med., 
  ii, 
  pt. 
  1) 
  as 
  being 
  present 
  on 
  the 
  ventral 
  surface 
  

   of 
  the 
  abdomen 
  of 
  the 
  female 
  are 
  also 
  found 
  on 
  the 
  male 
  in 
  all 
  Bornean 
  individuals 
  

   examined. 
  

  

  Many 
  specimens 
  of 
  this 
  species 
  were 
  found 
  in 
  the 
  buildings 
  on 
  estate 
  (A), 
  and 
  many 
  

   were 
  also 
  bred 
  from 
  larvae 
  found 
  in 
  the 
  swamp 
  and 
  in 
  the 
  estate 
  drains 
  near 
  the 
  

   swamp. 
  These 
  larvae 
  were 
  found 
  from 
  February, 
  1913, 
  until 
  December, 
  1913, 
  but 
  

   the 
  majority 
  of 
  the 
  adults 
  were 
  taken 
  between 
  May 
  and 
  October. 
  Females 
  always 
  

   predominated, 
  both 
  in 
  those 
  bred 
  from 
  larvae 
  and 
  in 
  captured 
  adults. 
  The 
  larvae 
  

   had 
  the 
  outer 
  anterior 
  clypeal 
  hair 
  thickly 
  branched, 
  as 
  described 
  by 
  Stanton. 
  The 
  

   pools 
  in 
  which 
  the 
  larvae 
  were 
  found 
  generally 
  consisted 
  of 
  swamp 
  water 
  without 
  

   scum, 
  i 
  Three 
  specimens 
  were 
  dissected 
  for 
  malarial 
  parasites, 
  but 
  none 
  were 
  found. 
  

  

  Anopheles 
  umbrosus, 
  Theo. 
  

  

  Myzorhynchus 
  umbrosus, 
  Theobald, 
  op. 
  cit, 
  iii, 
  p. 
  87, 
  1903 
  

  

  The 
  Borneo 
  specimens 
  agree 
  in 
  every 
  detail 
  with 
  Theobald's 
  description, 
  except 
  

   that 
  no 
  note 
  is 
  made 
  as 
  to 
  the 
  variation 
  of 
  the 
  wing 
  spots. 
  About 
  400 
  specimens 
  were 
  

   obtained, 
  mostly 
  from 
  the 
  estate 
  (A) 
  hospital, 
  and 
  females 
  very 
  much 
  predominated. 
  

   In 
  the 
  neighbourhood 
  of 
  Membakut 
  it 
  was 
  by 
  far 
  the 
  commonest 
  Anopheline, 
  and 
  as 
  

   many 
  as 
  90 
  have 
  been 
  taken 
  in 
  the 
  hospital 
  in 
  one 
  day. 
  It 
  was 
  also 
  a 
  frequent 
  

   visitor 
  in 
  other 
  houses 
  situated 
  near 
  the 
  swamp 
  or 
  jungle. 
  I 
  took 
  one 
  specimen 
  which 
  

   settled 
  on 
  me 
  in 
  the 
  open 
  near 
  a 
  small 
  hill 
  stream 
  during 
  the 
  day-time. 
  One 
  other 
  

   specimen 
  was 
  taken 
  in 
  the 
  net 
  of 
  a 
  coolie 
  on 
  estate 
  (C). 
  Although 
  a 
  large 
  number 
  of 
  

   larvae 
  were 
  bred 
  out 
  in 
  the 
  search 
  for 
  this 
  species, 
  its 
  larva 
  was 
  not 
  found. 
  The 
  con- 
  

   stant 
  presence 
  of 
  this 
  mosquito 
  in 
  the 
  hospital 
  could 
  not 
  be 
  accounted 
  for, 
  except 
  

   by 
  the 
  proximity 
  of 
  the 
  jungle, 
  and 
  as 
  no 
  larvae 
  could 
  be 
  found 
  in 
  the 
  swamp 
  or 
  

   jungle 
  some 
  particular 
  breeding 
  place 
  was 
  suspected 
  among 
  the 
  hospital 
  buildings, 
  

   but 
  a 
  careful 
  investigation 
  revealed 
  nothing. 
  Prolonged 
  search 
  was 
  also 
  made 
  in 
  

   the 
  hill 
  streams, 
  of 
  which 
  there 
  Avere 
  several 
  near 
  the 
  hospital, 
  but 
  no 
  larvae 
  were 
  

   found. 
  

  

  As 
  regards 
  the 
  time 
  of 
  year 
  during 
  which 
  most 
  of 
  the 
  specimens 
  were 
  captured, 
  

   it 
  was 
  found 
  that 
  the 
  numbers 
  gradually 
  increased 
  from 
  December, 
  1912, 
  to 
  a 
  maxi- 
  

   mum 
  in 
  June, 
  1913, 
  when 
  the 
  numbers 
  diminished 
  again 
  to 
  the 
  following 
  December. 
  

   From 
  May 
  to 
  October 
  is 
  the 
  most 
  malarial 
  season 
  in 
  this 
  district. 
  

  

  Of 
  130 
  specimens 
  dissected 
  only 
  one 
  captured 
  individual 
  was 
  found 
  with 
  the 
  

   sporozoites 
  of 
  malaria. 
  

  

  This 
  species 
  resembles 
  Anopheles 
  albotaeniatus 
  very 
  closely 
  in 
  every 
  particular, 
  

   except 
  as 
  to 
  the 
  hind 
  tarsi. 
  The 
  point 
  mentioned 
  by 
  Colonel 
  Alcock 
  in 
  his 
  paper, 
  

   " 
  Synopsis 
  of 
  the 
  Anopheline 
  Mosquitos 
  of 
  Africa 
  and 
  of 
  the 
  Oriental 
  Region 
  " 
  

   (Journ. 
  London 
  School 
  Trop. 
  Med., 
  ii, 
  pt. 
  3) 
  with 
  regard 
  to 
  the 
  legs 
  being 
  brown, 
  

   is 
  a 
  very 
  noticeable 
  one. 
  This 
  can 
  be 
  seen 
  readily 
  with 
  the 
  naked 
  eye 
  and 
  is 
  more 
  

   obvious 
  on 
  the 
  under 
  surface, 
  being 
  most 
  marked 
  in 
  fresh 
  specimens. 
  It 
  is, 
  I 
  think, 
  

   due 
  to 
  the 
  lighter 
  scaling 
  on 
  the 
  under 
  surface. 
  

  

  