﻿434 
  J. 
  W. 
  S. 
  MACFIE 
  AND 
  A. 
  INGRAM. 
  

  

  Pupa. 
  — 
  The 
  pupa 
  is 
  of 
  moderate 
  size, 
  measuring 
  about 
  4 
  mm. 
  to 
  5 
  mm. 
  when 
  

   extended, 
  and 
  is 
  well 
  chitinised. 
  The 
  following 
  description 
  is 
  based 
  on 
  the 
  examina- 
  

   tion 
  of 
  ten 
  specimens. 
  The 
  paddles 
  (fig. 
  19, 
  d), 
  which 
  average 
  about 
  0-7 
  mm. 
  in 
  length, 
  

   are 
  rather 
  narrow, 
  narrower 
  than 
  those 
  of 
  A. 
  (S.) 
  argenteus, 
  and 
  in 
  both 
  sexes 
  are 
  

   somewhat 
  pointed 
  at 
  the 
  distal 
  extremity, 
  the 
  ratio 
  of 
  their 
  length 
  to 
  their 
  greatest 
  

   breadth 
  averaged 
  1 
  -4 
  to 
  1. 
  They 
  are 
  supported 
  by 
  a 
  broad, 
  highly 
  chitinised, 
  midrib, 
  

   but 
  there 
  is 
  little 
  if 
  any 
  trace 
  of 
  an 
  external 
  buttress. 
  The 
  seta 
  at 
  the 
  distal 
  end 
  

   of 
  the 
  midrib 
  is 
  usually 
  single, 
  occasionally 
  double 
  or 
  bifid, 
  it 
  is 
  long, 
  average 
  length 
  

   about 
  115 
  \x. 
  The 
  paddles 
  bear 
  a 
  short 
  fringe 
  of 
  somewhat 
  denticulate 
  processes. 
  

   The 
  chaetotaxy 
  of 
  the 
  pupa 
  is 
  similar 
  to 
  that 
  of 
  A. 
  (S.) 
  argenteus. 
  The 
  lateral 
  

   setae 
  (A) 
  at 
  the 
  posterior 
  angles 
  of 
  segment 
  viii 
  are 
  not 
  very 
  large 
  tufts, 
  which 
  are 
  

   somewhat 
  variable 
  ; 
  in 
  the 
  ten 
  specimens 
  examined 
  they 
  were 
  composed 
  of 
  from 
  

   two 
  to 
  eight 
  setae, 
  average 
  four, 
  which 
  were 
  sometimes 
  simple, 
  sometimes 
  sub- 
  

   plumose, 
  sometimes 
  branched. 
  On 
  segment 
  vii 
  these 
  tufts 
  are 
  poorly 
  developed 
  and 
  

   are 
  generally 
  represented 
  by 
  a 
  single 
  stout 
  seta 
  which 
  is 
  usually 
  simple 
  but 
  may 
  be 
  

   subdivided 
  into 
  two 
  or 
  three 
  branches 
  and 
  may 
  be 
  subplumose. 
  The 
  lateral 
  setae 
  

   on 
  the 
  sixth 
  and 
  more 
  anterior 
  segments 
  are 
  quite 
  small, 
  single 
  and 
  simple. 
  The 
  

   other 
  setae 
  of 
  the 
  pupa 
  do 
  not 
  call 
  for 
  special 
  mention 
  as 
  they 
  are 
  apparently 
  similar 
  

   to 
  those 
  of 
  A. 
  (S.) 
  argenteus; 
  they 
  are, 
  however, 
  rather 
  small 
  and 
  usually 
  single. 
  

  

  Diagnosis. 
  — 
  The 
  most 
  characteristic 
  feature 
  of 
  the 
  pupa 
  is 
  the 
  shape 
  of 
  the 
  

   paddle, 
  which 
  distinguishes 
  it 
  from 
  the 
  other 
  species, 
  except 
  A. 
  (S.) 
  apico 
  argenteus, 
  

   that 
  we 
  have 
  examined. 
  It 
  should, 
  however, 
  be 
  noted 
  that 
  the 
  pupal 
  paddles 
  of 
  the 
  

   male 
  of 
  A 
  . 
  (S.) 
  luteocephalus 
  are 
  of 
  the 
  same 
  shape, 
  but 
  they 
  have 
  a 
  well-developed 
  

   fringe, 
  which 
  is 
  lacking 
  in 
  A. 
  (S.) 
  dendrophilus. 
  

  

  Habitat. 
  — 
  Aburi, 
  in 
  a 
  banana 
  stump, 
  6.vi.l920, 
  and 
  in 
  cut 
  bamboo, 
  26.V.1920, 
  

   and 
  21. 
  xi. 
  1920 
  ; 
  Dodowah, 
  in 
  a 
  rot-hole 
  of 
  a 
  mango 
  tree, 
  17.xii.1921 
  ; 
  Nsawam, 
  in 
  

   a 
  rot-hole 
  of 
  a 
  silk-cotton 
  tree, 
  16 
  hi. 
  1920 
  and 
  14. 
  iv. 
  1920 
  ; 
  Oblogo, 
  in 
  a 
  rot-hole 
  of 
  

   a 
  tree, 
  species 
  unknown, 
  17.iv.1920. 
  

  

  Culex 
  annulioris, 
  Theo. 
  

  

  Larva. 
  — 
  The 
  larva 
  of 
  this 
  mosquito 
  has 
  been 
  figured 
  by 
  Edwards 
  (Bull. 
  Ent. 
  

   Res. 
  iii, 
  p. 
  384) 
  and 
  included 
  in 
  his 
  key 
  to 
  the 
  larvae 
  of 
  African 
  Culicinae 
  ; 
  it 
  is 
  

   therefore 
  unnecessary 
  for 
  us 
  to 
  do 
  more 
  than 
  mention 
  a 
  few. 
  additional 
  characters. 
  

  

  The 
  tuft 
  on 
  the 
  antenna 
  is 
  situated 
  just 
  before 
  the 
  middle 
  of 
  the 
  shaft, 
  and 
  is 
  

   composed 
  of 
  pubescent 
  hairs. 
  The 
  mental 
  plate 
  is 
  similar 
  to 
  that 
  of 
  C. 
  bitaenio- 
  

   rhynchus. 
  The 
  lateral 
  abdominal 
  hairs 
  are 
  subplumose, 
  triple 
  on 
  the 
  first 
  four 
  seg- 
  

   ments, 
  double 
  thereafter. 
  The 
  comb 
  in 
  our 
  specimens 
  is 
  composed 
  of 
  five 
  teeth, 
  

   four 
  arranged 
  in 
  a 
  row, 
  and 
  one, 
  in 
  the 
  middle, 
  behind 
  them. 
  The 
  siphon 
  is 
  long, 
  

   variable 
  in 
  size, 
  but 
  about 
  three-quarters 
  the 
  length 
  of 
  the 
  abdomen, 
  and 
  from 
  ten 
  

   to 
  thirteen 
  times 
  as 
  long 
  as 
  its 
  basal 
  diameter 
  ; 
  it 
  bears 
  a 
  pecten 
  of 
  about 
  six 
  (five 
  to 
  

   seven) 
  slender 
  spines 
  and 
  several 
  small 
  tufts 
  of 
  hairs 
  (three 
  widely 
  separated 
  ventral 
  

   tufts 
  and 
  a 
  pair 
  of 
  subapical 
  tufts). 
  The 
  anal 
  segment 
  is 
  rather 
  long 
  and 
  narrow 
  

   and 
  bears 
  a 
  moderately 
  well-developed 
  beard. 
  The 
  dorsal 
  hairs 
  on 
  the 
  anal 
  segment 
  

   are 
  three 
  or 
  four 
  above 
  and 
  one 
  below 
  on 
  each 
  side. 
  The 
  anal 
  papillae 
  are 
  long, 
  slightly 
  

   longer 
  than 
  the 
  anal 
  segment, 
  subequal, 
  and 
  bluntly 
  pointed 
  at 
  their 
  extremities. 
  

  

  Diagnosis. 
  — 
  This 
  larva 
  resembles 
  that 
  of 
  C. 
  bitaeniorhynchus 
  but 
  may 
  be 
  dis- 
  

   tinguished 
  from 
  it 
  by 
  the 
  number 
  of 
  pecten 
  spines, 
  which 
  is 
  about 
  six 
  instead 
  of 
  

   only 
  three. 
  

  

  Pupa. 
  — 
  The 
  pupa 
  is 
  large, 
  and 
  has 
  infuscated 
  paddles. 
  Only 
  a 
  single 
  pelt 
  was 
  

   examined. 
  

  

  Cephalothorax. 
  The 
  respiratory 
  trumpets 
  (fig. 
  20, 
  a) 
  are 
  long 
  and 
  rather 
  narrow, 
  

   and 
  in 
  the 
  living 
  pupa 
  are 
  directed 
  forwards 
  ; 
  they 
  are 
  rather 
  pointed 
  at 
  their 
  tips, 
  

   have 
  not 
  very 
  wide 
  openings, 
  and 
  are 
  infuscated 
  at 
  the 
  distal 
  end 
  and 
  over 
  a 
  patch 
  

  

  