﻿THE 
  EARLY 
  STAGES 
  OF 
  WEST 
  AFRICAN 
  MOSQUITOS. 
  

  

  441 
  

  

  double 
  hairs 
  reaching 
  about 
  half 
  across 
  the 
  following 
  segment, 
  on 
  segments 
  iii 
  to 
  iv 
  

   larger, 
  delicate 
  tufts, 
  the 
  former 
  composed 
  of 
  about 
  fifteen 
  to 
  seventeen 
  and 
  the 
  

   latter 
  of 
  about 
  seven 
  to 
  nine 
  slightly 
  subplumose 
  hairs. 
  The 
  dendritic 
  tufts 
  on 
  

   segment 
  i 
  are 
  large 
  and 
  greatly 
  branched 
  ; 
  those 
  on 
  segment 
  ii 
  are 
  smaller 
  but 
  

   relatively 
  well 
  developed. 
  

  

  Diagnosis. 
  — 
  This 
  pupa 
  is 
  quite 
  unlike 
  that 
  of 
  C. 
  decens, 
  Theo., 
  and 
  may 
  readily 
  

   be 
  distinguished 
  by 
  the 
  characters 
  of 
  the 
  chief 
  abdominal 
  setae. 
  As 
  has 
  already 
  

   been 
  mentioned 
  the 
  lower 
  seta 
  of 
  the 
  antero-thoracic 
  group 
  on 
  the 
  cephalothorax 
  

   is 
  not 
  exceptionally 
  large, 
  as 
  it 
  is 
  in 
  Culiciomyia 
  nebulosa, 
  Theo. 
  The 
  adult 
  of 
  this 
  

   species, 
  which 
  is 
  new 
  to 
  science, 
  is 
  described 
  above 
  (p. 
  399). 
  

  

  Habitat. 
  — 
  Ofako, 
  a 
  village 
  about 
  nine 
  miles 
  from 
  Accra, 
  on 
  the 
  Nsawam 
  road, 
  

   v.1922 
  ; 
  larvae 
  collected 
  from 
  a 
  rot-hole 
  in 
  a 
  tree 
  in 
  dense 
  bush 
  ; 
  from 
  the 
  same 
  

   rot-hole 
  were 
  also 
  obtained 
  larvae 
  of 
  Toxorhynchites 
  brevipalpis, 
  Theo., 
  Aides 
  

   (0). 
  apicoannulatus 
  , 
  Edw., 
  and 
  of 
  Aedes 
  (Finlaya) 
  longipalpis, 
  Griinb. 
  

  

  Culex 
  (Micraedes) 
  inconspicuosus, 
  Theo. 
  

  

  Larva. 
  — 
  The 
  larva 
  of 
  this 
  mosquito 
  has 
  not 
  yet 
  been 
  identified. 
  

  

  Pupa. 
  — 
  The 
  pupa 
  is 
  rather 
  feebly 
  chitinised 
  ; 
  length 
  when 
  extended 
  about 
  

   3 
  mm. 
  Four 
  pelts 
  were 
  examined. 
  

  

  Cephalothorax. 
  The 
  respiratory 
  trumpets 
  (fig. 
  25, 
  a) 
  are 
  long 
  and 
  narrow, 
  with 
  

   a 
  broad 
  dark 
  band 
  a 
  little 
  proximal 
  to 
  the 
  middle 
  ; 
  length 
  about 
  0-57 
  mm., 
  middle 
  

   breadth 
  about 
  77 
  fi 
  ; 
  the 
  opening 
  is 
  of 
  moderate 
  size, 
  the 
  ratio 
  of 
  the 
  length 
  of 
  the 
  

   meatus 
  to 
  the 
  total 
  length 
  gf 
  the 
  trumpet 
  being 
  about 
  1 
  to 
  1-3. 
  The 
  setae 
  on 
  the 
  

   cephalothorax 
  are 
  small 
  and 
  not 
  very 
  highly 
  chitinised. 
  The 
  dorsal 
  setae 
  are 
  rather 
  

   long 
  tufts 
  of 
  two 
  to 
  four 
  hairs. 
  The 
  postero-thoracic 
  setae 
  are 
  moderately 
  well- 
  

   developed 
  tufts, 
  the 
  inner 
  of 
  about 
  four, 
  the 
  median 
  two, 
  and 
  the 
  external 
  three 
  hairs. 
  

  

  Fig. 
  25. 
  Pupa 
  of 
  Culex 
  inconspicuosus, 
  Theo. 
  : 
  a, 
  trumpet 
  ; 
  b, 
  dorsal 
  view 
  of 
  abdomcD. 
  

  

  Abdomen 
  (fig. 
  25, 
  b). 
  The 
  paddles 
  are 
  obovate 
  ; 
  length 
  about 
  0-6 
  mm., 
  greatest 
  

   breadth 
  about 
  0-4 
  mm. 
  The 
  midrib 
  is 
  moderately 
  well 
  developed, 
  and 
  there 
  is 
  a 
  

   narrow 
  external 
  buttress 
  which 
  appears 
  to 
  extend 
  about 
  half 
  the 
  length 
  of 
  the 
  paddle. 
  

   At 
  the 
  distal 
  end 
  of 
  the 
  midrib 
  are 
  two 
  hairs, 
  the 
  one 
  rather 
  long, 
  nearly 
  one-fifth 
  

   the 
  length 
  of 
  the 
  paddle, 
  and 
  the 
  other 
  quite 
  short 
  (about 
  30/*) 
  ; 
  these 
  hairs 
  are 
  

   usually 
  single, 
  occasionally 
  forked. 
  There 
  is 
  no 
  fringe. 
  

  

  