﻿THE 
  EARLY 
  STAGES 
  OF 
  WEST 
  AFRICAN 
  MOSQUITOS. 
  

  

  421 
  

  

  segment 
  i 
  is 
  moderately 
  well 
  developed, 
  and 
  is 
  composed 
  of 
  about 
  ten 
  (six 
  to 
  thirteen) 
  

   dark 
  plumose 
  hairs 
  ; 
  the 
  antero-internal 
  seta 
  is 
  small 
  but 
  stout 
  ; 
  the 
  antero-external 
  

   long, 
  strong, 
  black, 
  slightly 
  subplumose. 
  

  

  Ventral 
  abdominal 
  setae 
  all 
  very 
  small 
  and 
  inconspicuous 
  ; 
  arrangement 
  as 
  

   in 
  Aedes 
  argenteus 
  (Stegomyia 
  fasciata). 
  Postero-lateral 
  and 
  medio-lateral 
  small 
  

   tufts. 
  The 
  arrangement 
  of 
  the 
  setae 
  is 
  shown 
  in 
  the 
  diagram 
  (fig. 
  9, 
  b). 
  

  

  Habitat. 
  — 
  Aburi, 
  21 
  .xi. 
  1920, 
  in 
  cut 
  bamboos, 
  and 
  in 
  small 
  collections 
  of 
  water 
  

   in 
  banana 
  leaves 
  lying 
  on 
  the 
  ground 
  ; 
  Koforidua, 
  vii.1916, 
  in 
  pawpaw 
  tree 
  stump 
  ; 
  

   Nsawam, 
  l.i.1920, 
  in 
  disused 
  tins 
  near 
  the 
  Rest 
  House 
  and 
  in 
  a 
  hollow 
  stump 
  of 
  a 
  

   pawpaw 
  tree 
  ; 
  Taimang, 
  18.iii.1922, 
  in 
  pawpaw 
  tree 
  stumps. 
  

  

  Eretmopodiies 
  quinquevittatus, 
  Theo. 
  

  

  Larva. 
  — 
  The 
  larva 
  is 
  similar 
  to 
  that 
  of 
  E. 
  chrvsogaster, 
  and 
  it 
  is 
  therefore 
  only 
  

   necessary 
  to 
  describe 
  the 
  more 
  important 
  points 
  of 
  difference. 
  

  

  Fig. 
  10. 
  Larva 
  of 
  Eretmopodiies 
  quinquevittatus, 
  Theo., 
  terminal 
  segments 
  ol 
  abdomen 
  : 
  

   a, 
  mental 
  plate 
  ; 
  b, 
  subsiphonal 
  setae. 
  

  

  length 
  

  

  The 
  head 
  is 
  smaller 
  and 
  narrower, 
  the 
  greatest 
  breadth 
  almost 
  the 
  same 
  as 
  the 
  

   and 
  about 
  half 
  the 
  diameter 
  of 
  the 
  thorax. 
  Mental 
  plate 
  (fig. 
  10, 
  a) 
  with, 
  

   apparently, 
  six 
  teeth 
  on 
  each 
  side 
  of 
  the 
  middle 
  tooth. 
  The 
  dorso-lateral 
  setae 
  on 
  

   the 
  middle 
  third 
  of 
  the 
  thorax 
  more 
  highly 
  developed 
  and 
  forming 
  a 
  large 
  tuft, 
  half 
  

   ofjwhich 
  is 
  composed 
  of 
  short 
  and 
  half 
  of 
  long 
  hairs. 
  There 
  are 
  no 
  short, 
  stout 
  setae 
  

   on 
  the 
  sides 
  of 
  the 
  abdomen 
  similar 
  to 
  those 
  of 
  E. 
  chrysogaster 
  . 
  The 
  subsiphonal 
  

   tuft 
  is, 
  however, 
  a 
  short, 
  stout, 
  dark-coloured 
  seta 
  arising 
  from 
  a 
  chitinised 
  tubercle 
  

   and 
  divided 
  into 
  two 
  or 
  three 
  tapering 
  branches 
  (fig. 
  10, 
  b). 
  The 
  comb 
  is 
  composed 
  

   of 
  about 
  twenty-five 
  small 
  scales 
  arranged 
  in 
  a 
  triangular 
  patch 
  ; 
  each 
  scale 
  is 
  short, 
  

  

  (8455) 
  

  

  2G 
  

  

  