﻿THE 
  EARLY 
  STAGES 
  OF 
  WEST 
  AFRICAN 
  MOSQUITOS. 
  

  

  417 
  

  

  vi 
  and 
  vii 
  shorter, 
  single 
  hairs, 
  reaching 
  about 
  half-way 
  across 
  the 
  following 
  segments. 
  

   The 
  dendritic 
  tufts 
  (fig. 
  6, 
  c) 
  on 
  segment 
  i 
  are 
  large, 
  composed 
  of 
  about 
  ten 
  primary 
  

   branches. 
  On 
  segment 
  ii 
  there 
  are 
  small 
  dendritic 
  tufts 
  similar 
  to 
  those 
  found 
  in 
  

   the 
  genus 
  Culex. 
  

  

  Habitat. 
  — 
  Kpong, 
  iv.1922 
  ; 
  larvae 
  collected 
  from 
  rock-pools 
  near 
  the 
  River 
  

   Volta. 
  The 
  pools 
  were 
  fully 
  exposed 
  to 
  the 
  sun, 
  and 
  the 
  water 
  in 
  them 
  was 
  very 
  hot. 
  

   Mosquito 
  larvae, 
  mostly 
  of 
  Aides 
  (S.) 
  vittatus, 
  abounded 
  in 
  these 
  pools, 
  and 
  with 
  

   them 
  were 
  a 
  few 
  larvae 
  of 
  U. 
  inornata. 
  

  

  Fig. 
  6. 
  Pupa 
  of 
  Uranotaenia 
  inornata, 
  Theo. 
  : 
  a, 
  trumpet 
  ; 
  b, 
  dorsal 
  view 
  of 
  abdomen 
  ; 
  

   c, 
  dendritic 
  tufts 
  on 
  first 
  segment 
  of 
  abdomen. 
  

  

  Eretmopodites 
  chrysogaster, 
  Graham. 
  

  

  Larva. 
  — 
  Edwards 
  (Bull. 
  Ent. 
  Res. 
  iii, 
  p. 
  47) 
  has 
  figured 
  without 
  description 
  

   the 
  larvae 
  of 
  E. 
  chrysogaster, 
  but 
  the 
  drawings 
  are 
  on 
  a 
  small 
  scale 
  and 
  do 
  not 
  show 
  

   certain 
  important 
  points. 
  He 
  has 
  elsewhere 
  (Bull. 
  Ent. 
  Res. 
  iii, 
  p. 
  385) 
  mentioned 
  

   in 
  a 
  key 
  a 
  few 
  points 
  distinguishing 
  this 
  larva 
  from 
  that 
  of 
  E. 
  inomatus, 
  Newst. 
  

   We 
  have 
  in 
  our 
  possession 
  a 
  considerable 
  number 
  of 
  larvae 
  of 
  this 
  mosquito 
  and 
  

   larval 
  pelts 
  of 
  specimens 
  actually 
  bred 
  through 
  to 
  the 
  adult 
  stage. 
  In 
  some 
  respects, 
  

   for 
  example, 
  in 
  having 
  no 
  lateral 
  tuft 
  on 
  the 
  seventh 
  abdominal 
  segment 
  and 
  in 
  having 
  

   a 
  small 
  tuft 
  on 
  the 
  siphon, 
  these 
  specimens 
  differ 
  from 
  those 
  examined 
  by 
  Edwards, 
  

   and 
  for 
  this 
  reason 
  a 
  short 
  description 
  of 
  them 
  will 
  be 
  given. 
  

  

  Length, 
  9 
  to 
  12 
  mm. 
  

  

  Head 
  (fig. 
  7) 
  highly 
  chitinised, 
  not 
  very 
  large, 
  without 
  conspicuous 
  hair-tufts. 
  

   In 
  lateral 
  view 
  oval 
  ; 
  in 
  dorsal 
  view 
  rounded 
  and 
  rather 
  narrow 
  anteriorly, 
  broader 
  

   posteriorly, 
  with 
  rounded 
  posterior 
  angles. 
  Greatest 
  breadth 
  slightly 
  more 
  than 
  the 
  

   length, 
  but 
  less 
  than 
  the 
  breadth 
  of 
  the 
  thorax 
  (ratio 
  3 
  to 
  5). 
  On 
  theanterior 
  portion 
  

   of 
  the 
  dorsum 
  and 
  on 
  each 
  side 
  are 
  three 
  setae 
  arranged 
  in 
  a 
  triangle 
  ; 
  the 
  anterior 
  

   one 
  rather 
  long, 
  single 
  ; 
  the 
  internal, 
  small, 
  delicate, 
  double 
  ; 
  the 
  external, 
  rather 
  

   longer, 
  double. 
  The 
  dorso-lateral 
  seta 
  situated 
  on 
  a 
  level 
  with 
  the 
  base 
  on 
  the 
  antenna 
  

   on 
  each 
  side, 
  long, 
  single 
  or 
  double. 
  There 
  are 
  a 
  few 
  other 
  setae 
  on 
  the 
  head, 
  all 
  

   quite 
  small, 
  one 
  of 
  which 
  arises 
  in 
  the 
  posterior 
  eye 
  spot. 
  Antenna 
  (fig. 
  7, 
  a) 
  dark 
  

   brown, 
  cylindrical, 
  short, 
  scarcely 
  projecting 
  as 
  far 
  forwards 
  as 
  the 
  ends 
  of 
  the 
  

   mouth-brushes 
  ; 
  not 
  spiculated 
  and 
  without 
  hair-tuft, 
  but 
  bearing 
  at 
  about 
  its 
  

  

  