﻿THE 
  COMPARATIVE 
  MORPHOLOGY, 
  ETC. 
  323 
  

  

  filamentous, 
  while 
  the 
  posterior 
  invariably 
  lie 
  almost 
  in 
  a 
  direct 
  line 
  behind 
  or 
  even 
  

   external 
  to 
  them 
  ; 
  they 
  are 
  much 
  finer 
  than 
  in 
  rossi, 
  and 
  do 
  not 
  reach 
  further 
  than 
  

   about 
  the 
  point 
  of 
  origin 
  of 
  the 
  anterior 
  internal 
  hairs 
  (fig. 
  2, 
  a). 
  

  

  2. 
  The 
  palmate 
  hairs 
  of 
  ludlowi 
  are 
  rudimentary 
  on 
  the 
  first 
  abdominal 
  segment, 
  

   and 
  well-developed 
  from 
  the 
  second 
  to 
  the 
  seventh. 
  In 
  rossi 
  they 
  are 
  similar. 
  

  

  3. 
  The 
  relative 
  length 
  of 
  the 
  filament 
  to 
  the 
  leaflet 
  in 
  ludlowi 
  is 
  a 
  little 
  less 
  than 
  

   in 
  rossi, 
  but 
  the 
  distinction 
  is 
  too 
  fine 
  to 
  be 
  of 
  any 
  practical 
  use. 
  

  

  The 
  larva 
  of 
  ludlowi 
  is 
  therefore 
  quite 
  distinct 
  from 
  that 
  of 
  rossi.* 
  

  

  The 
  Pupa. 
  

  

  We 
  have 
  examined 
  the 
  empty 
  pupa-cases 
  of 
  the 
  two 
  species, 
  and 
  could 
  detect 
  no 
  

   difference 
  between 
  them. 
  

  

  The 
  Imago. 
  

  

  In 
  the 
  adult 
  stage 
  we 
  find 
  : 
  — 
  

  

  1. 
  Different 
  palpal 
  banding 
  in 
  the 
  two 
  species 
  (Plates 
  xxxii 
  and 
  xxxiii), 
  

   Indlowi 
  having 
  a 
  terminal 
  white 
  band 
  ■ 
  succeeded 
  by 
  a 
  black 
  band 
  of 
  nearly 
  equal 
  

   width, 
  whereafter 
  is 
  another 
  narrow 
  white 
  band 
  ; 
  rossi 
  having 
  a 
  terminal 
  white 
  

   band 
  of 
  much 
  greater 
  absolute 
  length 
  than 
  the 
  terminal 
  band 
  in 
  ludlowi, 
  succeeded 
  

   by 
  a 
  very 
  narrow 
  black 
  band, 
  and 
  this 
  by 
  another 
  white 
  band 
  of 
  similar 
  w 
  T 
  idth 
  to 
  

   the 
  black 
  band. 
  

  

  2. 
  The 
  size 
  of 
  the 
  mosquito 
  differs. 
  The 
  male 
  of 
  each 
  species 
  is 
  bigger 
  than 
  the 
  

   female, 
  but 
  the 
  comparative 
  size 
  of 
  the 
  two 
  species, 
  sex 
  for 
  sex, 
  can 
  be 
  judged 
  from 
  

   the 
  figures. 
  I 
  think 
  the 
  two 
  species 
  can 
  be 
  diagnosed 
  with 
  the 
  naked 
  eye 
  by 
  their 
  

   size 
  alone. 
  

  

  3. 
  The 
  general 
  impression 
  of 
  ludlowi 
  is 
  of 
  a 
  spotted 
  black 
  object, 
  rather 
  like 
  

   fuliginosus 
  in 
  this 
  respect, 
  but 
  rossi 
  is 
  very 
  light-coloured 
  — 
  in 
  fact, 
  with 
  the 
  exception 
  

   of 
  kochi, 
  it 
  is 
  perhaps 
  the 
  lightest 
  coloured 
  mosquito 
  we 
  have. 
  

  

  4. 
  The 
  leg 
  marking 
  differs 
  ; 
  ludloivi 
  is 
  as 
  spotted 
  as 
  maculatus, 
  with 
  the 
  distinction 
  

   that 
  the 
  spots 
  are 
  golden, 
  and 
  this 
  is 
  due 
  to 
  scaling 
  ; 
  whereas 
  in 
  rossi 
  there 
  is 
  

   nothing 
  more 
  than 
  a 
  little 
  tawny 
  mottling 
  due 
  to 
  the 
  black 
  leg 
  scales 
  not 
  completely 
  

   covering 
  the 
  chitin 
  beneath. 
  

  

  With 
  regard 
  to 
  the 
  imago, 
  it 
  need 
  only 
  be 
  said 
  that 
  in 
  a 
  series 
  of 
  255 
  which 
  we 
  

   examined 
  there 
  was 
  never 
  a 
  fly 
  which 
  could 
  not 
  be 
  referred 
  to 
  the 
  one 
  species 
  or 
  the 
  

   other. 
  I 
  think 
  the 
  confusion 
  which 
  exists 
  in 
  the 
  minds 
  of 
  medical 
  men 
  in 
  this 
  

   country 
  is 
  due 
  to 
  two 
  factors 
  : 
  — 
  (1) 
  That 
  the 
  palps 
  when 
  being 
  examined 
  have 
  been 
  

   foreshortened 
  and 
  the 
  true 
  relation 
  of 
  the 
  palpal 
  bands 
  is 
  not 
  seen 
  ; 
  and 
  (2) 
  that 
  

  

  * 
  As 
  a 
  certain 
  amount 
  of 
  confirmation 
  we 
  may 
  note 
  that 
  if 
  either 
  ludlowi 
  or 
  rossi 
  

   had 
  hatched 
  out 
  in 
  our 
  breeding 
  bottles, 
  on 
  examining 
  the 
  larvae 
  remaining 
  in 
  the 
  

   bottles, 
  we 
  found 
  in 
  every 
  case, 
  although 
  we 
  need 
  not 
  have 
  expected 
  such 
  favourable 
  

   evidence, 
  that 
  they 
  were 
  of 
  the 
  type 
  which 
  we 
  now 
  ascribe 
  to 
  the 
  respective 
  species. 
  

  

  In 
  young 
  larvae 
  the 
  distinction 
  between 
  the 
  two 
  species 
  is 
  very 
  fine, 
  and 
  could 
  not 
  be 
  

   relied 
  on 
  for 
  practical 
  purposes. 
  The 
  similarity 
  is 
  due 
  to 
  the 
  posterior 
  hairs 
  in 
  rossi 
  

   being 
  placed 
  far 
  apart 
  and 
  further 
  back, 
  much 
  as 
  in 
  ludlowi. 
  

  

  (C120) 
  D 
  2 
  

  

  