﻿63 
  

  

  NEW 
  SPECIES 
  OF 
  CULICIDAE 
  IN 
  THE 
  BRITISH 
  MUSEUM, 
  WITH 
  NOTES 
  

  

  ON 
  THE 
  GENITALIA 
  OF 
  SOME 
  AFRICAN 
  CULEX. 
  

  

  By 
  F. 
  W. 
  Edwards. 
  

  

  (Published 
  by 
  permission 
  of 
  the 
  Trustees 
  of 
  the 
  British 
  Museum.) 
  

  

  In 
  preparing 
  his 
  first 
  synopsis 
  of 
  the 
  African 
  species 
  of 
  Culex 
  (Bull. 
  Ent. 
  Res., 
  ii, 
  

   pt. 
  3, 
  Oct. 
  1911) 
  the 
  writer 
  relied 
  almost 
  entirely 
  upon 
  characters 
  of 
  coloration 
  for 
  the 
  

   separation 
  of 
  species, 
  and 
  had 
  made 
  no 
  study 
  of 
  the 
  male 
  genital 
  organs 
  ; 
  at 
  the 
  same 
  

   time 
  it 
  was 
  pointed 
  out 
  that 
  the 
  group 
  of 
  species 
  allied 
  to 
  Culex 
  invidiosus 
  required 
  

   much 
  additional 
  study 
  before 
  their 
  classification 
  could 
  be 
  regarded 
  as 
  satisfactory. 
  

   It 
  is 
  now 
  possible 
  to 
  give 
  in 
  full 
  the 
  results 
  of 
  further 
  study 
  of 
  the 
  African 
  species 
  of 
  

   Culex 
  of 
  the 
  pipiens 
  and 
  invidiosus 
  groups. 
  It 
  has 
  been 
  found 
  that, 
  in 
  these 
  groups 
  

   at 
  least, 
  the 
  species 
  can 
  most 
  readily 
  be 
  separated 
  by 
  means 
  of 
  the 
  male 
  genitalia, 
  and 
  

   also 
  that 
  one 
  or 
  two 
  names 
  which 
  had 
  previously 
  been 
  sunk 
  as 
  synonyms 
  must 
  in 
  

   reality 
  stand 
  as 
  good 
  species. 
  In 
  the 
  present 
  contribution 
  figures 
  are 
  given 
  of 
  the 
  

   male 
  genital 
  organs 
  of 
  eleven 
  species 
  ; 
  these, 
  together 
  with 
  the 
  four 
  already 
  illustrated 
  

   (Bull. 
  Ent. 
  Res., 
  iv, 
  pt. 
  1, 
  May 
  1913) 
  comprise 
  all 
  the 
  African 
  Culex 
  with 
  the 
  exception 
  

   of 
  (1) 
  those 
  with 
  a 
  banded 
  proboscis 
  ; 
  (2) 
  those 
  with 
  characteristic 
  leg 
  markings, 
  

   C. 
  tigripes 
  and 
  C. 
  tipuliformis 
  ; 
  (3) 
  C. 
  pruina, 
  which 
  is 
  described 
  below 
  ; 
  (4) 
  C. 
  

   didieri, 
  N.L., 
  and 
  C. 
  pygmaeus, 
  N.L., 
  which 
  the 
  writer 
  is 
  unable 
  to 
  recognise 
  ; 
  and 
  (5) 
  

   those 
  with 
  the 
  pale 
  markings 
  of 
  the 
  abdomen 
  situated 
  towards 
  the 
  apices 
  of 
  the 
  seg- 
  

   ments. 
  As 
  before, 
  all 
  the 
  figures 
  have 
  been 
  prepared 
  by 
  Mr. 
  A. 
  J. 
  Engel 
  Terzi 
  with 
  

   very 
  great 
  care 
  and 
  accuracy, 
  and 
  I 
  am 
  much 
  indebted 
  to 
  him 
  for 
  his 
  assistance 
  in 
  this 
  

   difficult 
  piece 
  of 
  work. 
  

  

  The 
  male 
  hypopygium 
  of 
  Culex 
  may 
  be 
  described 
  as 
  follows 
  : 
  — 
  The 
  word 
  hypopygium 
  

   is 
  used 
  to 
  denote 
  all 
  the 
  structures 
  representing 
  the 
  ninth 
  and 
  tenth 
  segments 
  of 
  the 
  

   abdomen. 
  The 
  ninth 
  segment 
  is 
  typically 
  represented 
  by 
  a 
  small 
  tergite 
  and 
  sternite 
  

   and 
  a 
  pair 
  of 
  large 
  side-pieces 
  carrying 
  the 
  claspers 
  at 
  their 
  ends. 
  In 
  Culex 
  the 
  ninth 
  

   tergite 
  is 
  usually 
  about 
  twice 
  as 
  broad 
  as 
  long, 
  the 
  only 
  exception 
  known 
  to 
  me 
  

   occurring 
  in 
  C. 
  perfidiosus 
  (fig. 
  12) 
  in 
  which 
  this 
  plate 
  is 
  distinctly 
  longer 
  than 
  it 
  is 
  

   broad. 
  The 
  sternite, 
  as 
  in 
  most 
  other 
  Culicidae, 
  is 
  represented 
  by 
  a 
  pair 
  of 
  narrow 
  

   plates 
  just 
  connected 
  in 
  the 
  middle 
  and 
  furnished 
  on 
  their 
  posterior 
  margin 
  with 
  a 
  

   fringe 
  of 
  hairs 
  ; 
  these 
  lobes 
  have 
  been 
  variously 
  termed 
  the 
  setaceous 
  lobes 
  and 
  the 
  

   basal 
  appendages 
  ; 
  they 
  are 
  incorrectly 
  regarded 
  by 
  Felt, 
  Theobald, 
  Howard, 
  Dyar 
  and 
  

   Knab 
  as 
  belonging 
  to 
  the 
  eighth 
  abdominal 
  segment. 
  The 
  side-pieces 
  are 
  very 
  hairy, 
  

   but 
  without 
  scales 
  ; 
  they 
  have 
  processes 
  on 
  their 
  inner 
  side 
  near 
  the 
  apex 
  which 
  bear 
  

   a 
  leaf-like 
  plate 
  and 
  five 
  or 
  six 
  usually 
  more 
  or 
  less 
  rod-like 
  filaments. 
  The 
  tenth 
  

   body-segment 
  is 
  represented 
  in 
  the 
  simplest 
  forms 
  of 
  Culex 
  by 
  three 
  sets 
  of 
  paired 
  

  

  