﻿68 
  DRS. 
  A. 
  INGRAM 
  AND 
  J. 
  W. 
  S. 
  MACFIE. 
  

  

  Of 
  the 
  other 
  hairs 
  on 
  the 
  abdominal 
  segments 
  the 
  most 
  important 
  are 
  those 
  forming 
  

   the 
  inner 
  and 
  outer 
  lateral 
  rows. 
  The 
  outer 
  lateral 
  row 
  is 
  composed 
  of 
  a 
  minute 
  

   divided 
  hair 
  on 
  the 
  7th 
  segment, 
  a 
  long 
  single 
  or 
  double 
  hair 
  on 
  the 
  6th 
  and 
  5th 
  

   segments, 
  and 
  a 
  tuft 
  of 
  three 
  or 
  more 
  hairs 
  on 
  the 
  4th 
  segment. 
  The 
  inner 
  lateral 
  

   row 
  on 
  the 
  7th 
  to 
  the 
  4th 
  segments 
  is 
  composed 
  of 
  tufts 
  which 
  are 
  larger 
  in 
  the 
  more 
  

   anterior 
  segments. 
  These 
  rows 
  are 
  shown 
  in 
  the 
  figure. 
  On 
  the 
  3rd 
  segment 
  the 
  most 
  

   conspicuous 
  hairs 
  are 
  a 
  tuft 
  in 
  line 
  with 
  the 
  inner 
  lateral 
  row, 
  a 
  double 
  hair 
  above 
  

   and 
  a 
  little 
  external 
  to 
  this 
  tuft, 
  and 
  another 
  tuft 
  above 
  and 
  external 
  to 
  the 
  double 
  

   hair. 
  The 
  dendritic 
  hairs 
  or 
  tufts 
  on 
  the 
  1st 
  segment 
  are 
  well 
  developed 
  and 
  have 
  

   about 
  a 
  dozen 
  primary 
  branches. 
  

  

  The 
  respiratory 
  trumpets 
  are 
  long 
  and 
  narrow, 
  about 
  *9 
  mm. 
  in 
  length. 
  The 
  ratio 
  

   of 
  length 
  to 
  greatest 
  breadth 
  is, 
  in 
  a 
  mounted 
  specimen, 
  5 
  to 
  1. 
  The 
  trumpet 
  is 
  

   banded, 
  the 
  proximal 
  end 
  being 
  pale 
  and 
  the 
  distal 
  end 
  dark, 
  and 
  the 
  middle 
  zone 
  is 
  

   divided 
  into 
  two 
  portions, 
  the 
  upper 
  being 
  pale 
  and 
  the 
  lower 
  dark. 
  The 
  ratio 
  of 
  

   the 
  length 
  of 
  the 
  closed 
  portion, 
  the 
  meatus, 
  to 
  the 
  total 
  length 
  of 
  the 
  trumpet 
  is 
  

   about 
  1 
  to 
  1*16, 
  that 
  is 
  the 
  meatus 
  is 
  very 
  long. 
  

  

  Diagnosis. 
  — 
  See 
  Culex 
  ager 
  var. 
  ethiopicus 
  (p. 
  66). 
  

  

  Culex 
  univittatus, 
  Theo. 
  

  

  Larva 
  (fig. 
  7). 
  — 
  The 
  head 
  is 
  large, 
  nearly 
  as 
  wide 
  as 
  the 
  thorax. 
  The 
  brushes 
  are 
  

   well 
  developed. 
  The 
  antenna 
  is 
  dark 
  and 
  covered 
  with 
  prominent 
  spicules, 
  the 
  

   hair-tuft 
  being 
  situated 
  just 
  before 
  the 
  middle 
  point 
  of 
  the 
  shaft. 
  The 
  mid-frontal 
  

   hairs 
  are 
  multiple, 
  the 
  constituent 
  hairs 
  being 
  lightly 
  subplumose 
  ; 
  the 
  ante-antennal 
  

   tuft 
  is 
  also 
  composed 
  of 
  lightly 
  subplumose 
  hairs. 
  The 
  mental 
  plate 
  is 
  triangular 
  

   in 
  shape 
  ; 
  it 
  has 
  a 
  central 
  tooth 
  with 
  about 
  ten 
  to 
  twelve 
  teeth 
  on 
  each 
  side, 
  the 
  

   lateral 
  teeth 
  being 
  small, 
  but 
  gradually 
  increasing 
  in 
  size 
  towards 
  the 
  base 
  of 
  the 
  plate. 
  

  

  The 
  thoracic 
  plumes, 
  which 
  are 
  formed 
  of 
  subplumose 
  hairs, 
  are 
  well 
  developed. 
  

   The 
  lateral 
  abdominal 
  hairs 
  are 
  multiple 
  on 
  the 
  first 
  two 
  segments, 
  triple 
  on 
  the 
  

   third 
  segment, 
  and 
  thereafter 
  single 
  on 
  each 
  segment. 
  

  

  All 
  the 
  plumes 
  on 
  the 
  8th 
  abdominal 
  segment 
  are 
  formed 
  of 
  simple 
  or 
  only 
  slightly 
  

   subplumose 
  hairs. 
  The 
  comb 
  consists 
  of 
  about 
  8 
  spines 
  arranged 
  irregularly. 
  The 
  

   siphon 
  is 
  about 
  seven 
  or 
  eight 
  times 
  as 
  long 
  as 
  its 
  width 
  at 
  the 
  basal 
  ring, 
  and 
  tapers 
  

   regularly 
  from 
  base 
  to 
  apex. 
  The 
  pecten 
  extends 
  about 
  two-fifths 
  of 
  the 
  length 
  of 
  

   the 
  siphon 
  from 
  the 
  basal 
  ring 
  ; 
  it 
  consists 
  of 
  13 
  to 
  16 
  teeth 
  of 
  which 
  the 
  two 
  or 
  three 
  

   furthest 
  from 
  the 
  base 
  are 
  more 
  detached 
  and 
  have 
  no 
  secondary 
  spines. 
  There 
  is 
  

   a 
  slight 
  tuft 
  of 
  a 
  few 
  simple 
  hairs 
  some 
  distance 
  beyond 
  the 
  last 
  tooth 
  of 
  the 
  pecten, 
  

   namely, 
  at 
  a 
  point 
  about 
  three-quarters 
  of 
  the 
  length 
  of 
  the 
  siphon 
  from 
  its 
  base. 
  

  

  The 
  anal 
  segment 
  carries 
  very 
  long 
  papillae, 
  three 
  times 
  the 
  length 
  of 
  the 
  segment, 
  

   the 
  dorsal 
  pair 
  being 
  slightly 
  longer 
  than 
  the 
  ventral. 
  The 
  beard 
  is 
  well 
  developed. 
  

   The 
  hairs 
  on 
  the 
  dorsal 
  end 
  of 
  the 
  segment 
  are 
  peculiar, 
  consisting 
  of 
  a 
  fan-like 
  

   collection 
  of 
  8 
  or 
  9 
  hairs 
  above 
  and 
  an 
  extremely 
  long 
  hair 
  below 
  on 
  each 
  side. 
  The 
  

   long 
  hairs 
  are 
  nearly 
  twice 
  as 
  long 
  as 
  the 
  anal 
  papillae. 
  

  

  Diagnosis. 
  — 
  Edwards 
  includes 
  the 
  larva 
  of 
  this 
  mosquito 
  in 
  his 
  key 
  to 
  the 
  larvae 
  of 
  

   the 
  genus 
  Culex 
  (BulL 
  Ent. 
  Kes. 
  iii, 
  p. 
  381), 
  but 
  states 
  that 
  there 
  are 
  six 
  teeth 
  in 
  the 
  

   pecten, 
  whereas 
  our 
  specimens 
  had 
  13 
  to 
  16. 
  This 
  discrepancy 
  does 
  not, 
  however, 
  

  

  