﻿428 
  J. 
  W. 
  S. 
  MACFIE 
  AND 
  A. 
  INGRAM. 
  

  

  consists 
  of 
  about 
  ten 
  to 
  twelve 
  subplumose 
  hairs. 
  The 
  three 
  hairs 
  on 
  each 
  side 
  of 
  

   the 
  middle 
  line 
  on 
  the 
  dorsum 
  are 
  large, 
  multiple, 
  and 
  subplumose, 
  the 
  inner 
  (pre- 
  

   antennal) 
  one 
  composed 
  of 
  about 
  fourteen 
  to 
  sixteen 
  hairs, 
  the 
  posterior 
  (inner 
  post- 
  

   antennal) 
  of 
  five 
  hairs, 
  and 
  the 
  anterior 
  (middle 
  post-antennal) 
  of 
  six 
  hairs. 
  There 
  

   is 
  a 
  large 
  lateral 
  hair-tuft 
  posterior 
  to 
  the 
  ante-antennal 
  tuft 
  consisting 
  of 
  subplumose 
  

   hairs. 
  The 
  mental 
  plate 
  has 
  a 
  stout 
  central 
  tooth, 
  on 
  either 
  side 
  of 
  which 
  are 
  ten 
  or 
  

   eleven 
  more 
  slender 
  teeth, 
  those 
  nearest 
  the 
  central 
  tooth 
  being 
  more 
  closely 
  

   approximated 
  and 
  narrower 
  than 
  those 
  situated 
  more 
  externally. 
  

  

  Thorax. 
  The 
  thoracic 
  plumes 
  are 
  fairly 
  well 
  developed, 
  the 
  constituent 
  hairs 
  

   being 
  subplumose 
  ; 
  the 
  main 
  plumes 
  rise 
  from 
  chitinous 
  bosses. 
  

  

  Abdomen. 
  The 
  dorso-lateral 
  hairs 
  are 
  long, 
  paired, 
  subplumose. 
  Numerous 
  

   stellar 
  hair-tufts 
  are 
  present 
  on 
  all 
  the 
  abdominal 
  segments. 
  The 
  siphonal, 
  sub- 
  

   siphonal, 
  and 
  anal 
  plumes 
  are 
  composed 
  of 
  subplumose 
  hairs. 
  All 
  these 
  plumes 
  are 
  

   well 
  developed 
  and 
  rise 
  from 
  chitinous 
  sockets. 
  The 
  comb 
  is 
  formed 
  of 
  about 
  eight 
  

   pointed 
  teeth, 
  without 
  secondary 
  barbs 
  but 
  with 
  a 
  delicate 
  fringe 
  basally, 
  placed 
  

   in 
  a 
  curved 
  row. 
  The 
  siphon 
  is 
  well 
  chitinised, 
  about 
  three 
  times 
  as 
  long 
  as 
  the 
  

   diameter 
  of 
  its 
  basal 
  ring. 
  It 
  bears 
  a 
  pecten 
  of 
  about 
  twenty 
  spines 
  which 
  extends 
  

   over 
  rather 
  more 
  than 
  one-third 
  (five-twelfths) 
  of 
  its 
  length 
  ; 
  these 
  spines 
  have 
  a 
  

   secondary 
  barb 
  at 
  their 
  base 
  -and 
  are 
  somewhat 
  irregularly 
  placed. 
  The 
  tuft 
  on 
  

   the 
  siphon 
  is 
  formed 
  of 
  four 
  or 
  five 
  hairs, 
  which 
  are 
  almost 
  simple, 
  and 
  is 
  situated 
  

   at 
  about 
  the 
  middle 
  of 
  the 
  tube. 
  The 
  anal 
  segment 
  is 
  irregularly 
  chitinised 
  over 
  a 
  

   saddle-shaped 
  area. 
  On 
  each 
  side 
  at 
  its 
  posterior 
  border 
  is 
  a 
  long 
  stout 
  double 
  seta. 
  

   The 
  beard 
  is 
  poorly 
  developed. 
  The 
  dorsal 
  hairs 
  at 
  the 
  distal 
  end 
  of 
  the 
  anal 
  

   segment 
  appear 
  to 
  be 
  four 
  above 
  and 
  one 
  below 
  on 
  each 
  side, 
  the 
  latter 
  being 
  very 
  

   long 
  and 
  stout. 
  The 
  anal 
  papillae 
  are 
  well 
  developed, 
  about 
  two 
  and 
  a 
  half 
  times 
  

   the 
  length 
  of 
  the 
  anal 
  segment, 
  and 
  have 
  rounded 
  extremities. 
  

  

  Diagnosis. 
  — 
  This 
  larva 
  may 
  be 
  distinguished 
  from 
  other 
  known 
  African 
  Aedes 
  

   [Ochlerotatus) 
  larvae 
  by 
  having 
  the 
  median 
  hairs 
  on 
  the 
  head 
  multiple, 
  a 
  comb 
  of 
  

   about 
  eight 
  spines, 
  and 
  a 
  pecten 
  of 
  about 
  twenty 
  spines. 
  

  

  Pupa. 
  — 
  The 
  pupa 
  is 
  rather 
  small 
  and 
  not 
  very 
  highly 
  chitinised. 
  

  

  Cephalothorax. 
  The 
  respiratory 
  trumpets 
  are 
  highly 
  chitinised 
  and 
  shagreened. 
  

   The 
  cephalothoracic 
  setae 
  are 
  similar 
  to 
  those 
  of 
  Aedes 
  (S.) 
  argenteus 
  (Bull. 
  Ent. 
  

   Res. 
  x, 
  pp. 
  161-164). 
  

  

  Abdomen. 
  The 
  paddles 
  are 
  oval, 
  about 
  0-9 
  mm. 
  long; 
  the 
  ratio 
  of 
  length 
  to 
  

   greatest 
  breadth 
  is 
  1 
  -6 
  to 
  1. 
  The 
  midrib 
  is 
  well 
  developed 
  and 
  divides 
  the 
  paddle 
  

   into 
  two 
  approximately 
  equal 
  parts. 
  There 
  is 
  a 
  single, 
  long, 
  stout 
  seta, 
  about 
  • 
  1 
  mm. 
  

   in 
  length, 
  at 
  the 
  distal 
  end 
  of 
  the 
  midrib. 
  The 
  external 
  buttress 
  is 
  rather 
  feebly 
  

   developed. 
  The 
  paddle 
  is 
  not 
  furnished 
  with 
  a 
  definite 
  fringe 
  but 
  bears 
  a 
  few 
  short 
  

   hairs 
  or 
  fimbriae 
  along 
  its 
  posterior 
  border. 
  

  

  The 
  arrangement 
  of 
  the 
  dorsal 
  abdominal 
  setae 
  is 
  similar 
  to 
  that 
  in 
  Aedes 
  (S.) 
  

   argenteus 
  (loc. 
  cit., 
  pp. 
  164-167). 
  Mention 
  need 
  only 
  be 
  made 
  of 
  the 
  more 
  important 
  

   of 
  them 
  : 
  the 
  lateral 
  setae 
  (A) 
  are 
  delicate 
  and 
  single 
  on 
  segments 
  i 
  to 
  vi, 
  on 
  segment 
  

   vii 
  relatively 
  stout 
  single 
  or 
  double 
  setae 
  reaching 
  to 
  about 
  the 
  middle 
  of 
  the 
  succeeding 
  

   segment, 
  and 
  on 
  segment 
  viii 
  well 
  developed 
  tufts, 
  about 
  half 
  the 
  length 
  of 
  the 
  

   paddle, 
  composed 
  of 
  about 
  six 
  subplumose 
  hairs, 
  some 
  of 
  which 
  are 
  branched. 
  The 
  

   sublateral 
  setae 
  (B) 
  are 
  long 
  and 
  single, 
  on 
  segments 
  ii 
  and 
  iii 
  rather 
  delicate, 
  on 
  

   segments 
  iv 
  and 
  v 
  stouter 
  and 
  longer 
  and 
  reaching 
  backwards 
  to 
  about 
  the 
  middle 
  

   of 
  the 
  next 
  segment 
  but 
  one, 
  on 
  segment 
  vi 
  stout 
  but 
  rather 
  shorter 
  and 
  reaching 
  

   nearly 
  to 
  the 
  posterior 
  margin 
  of 
  the 
  succeeding 
  segment, 
  and 
  on 
  segment 
  vii 
  rather 
  

   stout 
  but 
  not 
  reaching 
  beyond 
  the 
  middle 
  of 
  the 
  next 
  segment. 
  The 
  dendritic 
  tufts 
  

   on 
  segment 
  i 
  well 
  developed, 
  those 
  on 
  the 
  second 
  segment 
  smaller 
  but 
  characteristic. 
  

   The 
  ventral 
  abdominal 
  setae 
  are 
  small 
  and 
  inconspicuous 
  and 
  are 
  similar 
  to 
  those 
  of 
  

   Aedes 
  (S.) 
  argenteus 
  (loc. 
  cit 
  ., 
  pp. 
  167-169). 
  The 
  abdominal 
  stigmata 
  are 
  conspicuous. 
  

  

  