﻿THE 
  EARLY 
  STAGES 
  OF 
  WEST 
  AFRICAN 
  MOSQUITOS. 
  

  

  411 
  

  

  Abdomen. 
  There 
  are 
  serrated 
  hairs 
  arising 
  from 
  chitinous 
  plates 
  on 
  every 
  

   segment. 
  Some 
  of 
  these 
  hairs 
  are 
  relatively 
  stout, 
  slightly 
  curved, 
  and 
  barbed 
  only 
  

   on 
  their 
  convex 
  side 
  (fig. 
  2, 
  /). 
  On 
  segment 
  viii 
  there 
  is 
  a 
  single 
  large 
  chitinous 
  plate 
  

   on 
  each 
  side, 
  from 
  the 
  posterior 
  margin 
  of 
  which 
  arise 
  two 
  stout, 
  curved, 
  serrated 
  

   setae. 
  There 
  is 
  no 
  comb. 
  The 
  siphonal 
  and 
  subsiphonal 
  setae 
  appear 
  to 
  be 
  absent 
  ; 
  

   the 
  anal 
  seta 
  is 
  a 
  small 
  single 
  hair. 
  The 
  siphon 
  is 
  short, 
  about 
  twice 
  as 
  long 
  as 
  the 
  

   diameter 
  of 
  its 
  basal 
  ring, 
  and 
  highly 
  chitinised. 
  There 
  is 
  no 
  pecten. 
  Near 
  the 
  

   base 
  of 
  the 
  siphon, 
  on 
  each 
  side, 
  is 
  a 
  large 
  tuft 
  of 
  three 
  to 
  five 
  plumose 
  hairs. 
  The 
  

   anal 
  segment 
  is 
  slightly 
  shorter 
  than 
  the 
  siphon, 
  completely 
  chitinised 
  ; 
  its 
  posterior 
  

  

  Fig. 
  2. 
  Larva 
  of 
  Megarhinus 
  (Toxorhynchites) 
  brevipalpis, 
  Theo. 
  : 
  a, 
  anterior 
  portion 
  

   of 
  body 
  ; 
  b, 
  antenna 
  ; 
  c, 
  mouth-brush 
  ; 
  d, 
  mandible 
  ; 
  e, 
  mental 
  plate 
  ; 
  /, 
  plumose 
  

  

  hairs 
  of 
  abdomen 
  

  

  