﻿410 
  J. 
  W. 
  S. 
  MACFIE 
  AND 
  A. 
  INGRAM. 
  

  

  points 
  ; 
  on 
  segment 
  iv 
  they 
  are 
  smaller 
  but 
  still 
  of 
  considerable 
  size, 
  strong 
  and 
  

   sharply 
  pointed 
  ; 
  but 
  on 
  segments 
  ii 
  and 
  iii 
  they 
  are 
  minute, 
  sharply 
  pointed 
  setae, 
  

   and 
  rather 
  feebly 
  chitinised. 
  The 
  sublateral 
  (B) 
  and 
  submedian 
  (C) 
  setae 
  on 
  the 
  

   dorsal 
  aspect 
  of 
  the 
  abdomen 
  are 
  unusually 
  well 
  developed, 
  and 
  on 
  segments 
  iii 
  

   to 
  vii 
  they 
  are 
  large 
  tufts. 
  The 
  sublateral 
  setae 
  resemble 
  the 
  lateral 
  setae 
  on 
  

   segment 
  viii, 
  that 
  is, 
  they 
  have 
  a 
  central 
  stem 
  which 
  gives 
  off 
  numerous 
  branches 
  

   on 
  each 
  side 
  ; 
  the 
  submedian 
  setae 
  are 
  more 
  like 
  ordinary 
  branched 
  setae. 
  The 
  

   dendritic 
  tufts 
  on 
  segment 
  i 
  are 
  large 
  and 
  composed 
  of 
  long, 
  fine 
  hairs. 
  The 
  other 
  

   setae 
  of 
  the 
  pupa 
  do 
  not 
  appear 
  to 
  call 
  for 
  special 
  mention. 
  

  

  Diagnosis. 
  — 
  The 
  pupa 
  of 
  A. 
  nili 
  somewhat 
  resembles 
  that 
  of 
  A. 
  funestus, 
  from 
  

   which, 
  however, 
  it 
  may 
  be 
  distinguished 
  by 
  having 
  the 
  submedian 
  setae 
  on 
  

   segments 
  v 
  to 
  vii 
  developed 
  as 
  tufts 
  instead 
  of 
  being 
  long 
  single 
  or 
  double 
  hairs, 
  as 
  

   well 
  as 
  by 
  other 
  characters. 
  

  

  Habitat. 
  — 
  Oblogo, 
  7.ii.l921, 
  larvae 
  collected 
  among 
  plants 
  of 
  the 
  water 
  lettuce 
  

   (Pistia 
  stratiotes) 
  in 
  the 
  river 
  Densu. 
  

  

  Megarhinus 
  (Toxorhynchites) 
  brevipalpis, 
  Theo. 
  

  

  A 
  figure 
  showing 
  the 
  paddles 
  and 
  the 
  last 
  three 
  abdominal 
  segments 
  of 
  the 
  

   pupa 
  of 
  this 
  mosquito 
  has 
  been 
  published, 
  together 
  with 
  a 
  few 
  words 
  of 
  explanation, 
  

   by 
  Bacot 
  (Yellow 
  Fever 
  Commission, 
  West 
  Africa, 
  Reports, 
  iii, 
  p. 
  145) 
  ; 
  and 
  a 
  

   larva, 
  presumed 
  to 
  be 
  that 
  of 
  M. 
  brevipalpis, 
  has 
  been 
  briefly 
  described 
  by 
  Edwards 
  

   (Bull. 
  Ent. 
  Res. 
  iii, 
  p. 
  375). 
  Neither 
  of 
  these 
  authors, 
  however, 
  has 
  given 
  sufficient 
  

   details 
  to 
  distinguish 
  the 
  species, 
  and 
  indeed 
  it 
  seems 
  not 
  unlikely 
  that 
  the 
  characters 
  

   mentioned 
  by 
  them 
  are 
  mainly 
  generic. 
  As 
  we 
  have 
  in 
  our 
  possession 
  specimens 
  

   of 
  both 
  larvae 
  and 
  pupae 
  of 
  M. 
  brevipalpis, 
  we 
  have 
  taken 
  the 
  opportunity 
  of 
  

   examining 
  them 
  in 
  detail. 
  

  

  Larva. 
  — 
  The 
  larva 
  when 
  fulfy 
  grown 
  is 
  very 
  large, 
  about 
  14 
  mm. 
  long, 
  and 
  dark 
  

   grey 
  or 
  reddish-brown 
  coloured, 
  corresponding 
  in 
  tint 
  to 
  that 
  of 
  the 
  debris 
  at 
  the 
  

   bottom 
  of 
  the 
  water 
  in 
  which 
  it 
  is 
  found. 
  In 
  the 
  laboratory, 
  when 
  under 
  observation, 
  

   we 
  have 
  fed 
  it 
  on 
  larvae 
  of 
  Aedes 
  argenteus 
  (Stegomyia 
  fasciata). 
  When 
  at 
  the 
  surface 
  

   of 
  the 
  water 
  the 
  attitude 
  of 
  the 
  larva 
  is 
  less 
  horizontal 
  than 
  that 
  of 
  Lutzia 
  tigripes. 
  

   If 
  disturbed 
  the 
  larva 
  at 
  once 
  seeks 
  the 
  bottom 
  of 
  the 
  jar 
  in 
  which 
  it 
  is 
  confined 
  and 
  

   is 
  able 
  to 
  remain 
  there 
  for 
  several 
  minutes 
  at 
  least 
  without 
  coming 
  to 
  the 
  surface 
  

   to 
  breathe. 
  

  

  Head 
  (fig. 
  2, 
  a) 
  relatively 
  small, 
  highly 
  chitinised. 
  Clypeus 
  deeply 
  notched 
  in 
  

   the 
  middle. 
  Antenna 
  (fig. 
  2, 
  b) 
  short, 
  cylindrical, 
  smooth, 
  with 
  a 
  very 
  small 
  tuft 
  

   and 
  two 
  hairs 
  on 
  its 
  inner 
  aspect 
  near 
  the 
  distal 
  extremity. 
  Mouth-brushes 
  (fig. 
  2, 
  c) 
  

   small, 
  composed 
  of 
  about 
  ten 
  (eight 
  or 
  nine) 
  strong 
  curved 
  elements 
  which 
  are 
  highly 
  

   chitinised 
  and 
  not 
  pectinated 
  but 
  armed 
  at 
  their 
  tips 
  with 
  two 
  small 
  teeth. 
  

   Mandibles 
  very 
  powerful, 
  armed 
  with 
  two 
  large 
  and 
  three 
  or 
  four 
  smaller 
  teeth 
  

   (fig. 
  2, 
  d). 
  Mental 
  plate 
  very 
  highly 
  chitinised 
  and 
  black, 
  flat, 
  with 
  a 
  large, 
  notched, 
  

   and 
  not 
  prominent 
  central 
  tooth, 
  and 
  with 
  five 
  to 
  seven 
  broad 
  teeth 
  on 
  each 
  side 
  

   which 
  are 
  irregular 
  in 
  size 
  (fig. 
  2, 
  e). 
  The 
  setae 
  on 
  the 
  head 
  are 
  small 
  and 
  incon- 
  

   spicuous 
  ; 
  the 
  most 
  prominent 
  are 
  branched 
  hairs, 
  one 
  arising 
  actually 
  in 
  the 
  eye 
  spot, 
  

   one 
  above 
  it, 
  and 
  two 
  immediately 
  in 
  front 
  of 
  it 
  ; 
  a 
  short 
  row 
  of 
  four 
  setae, 
  a 
  small 
  

   tuft 
  internally 
  and 
  three 
  single 
  hairs 
  externally, 
  on 
  each 
  side 
  of 
  the 
  dorsum 
  laterally 
  

   and 
  almost 
  on 
  a 
  level 
  with 
  the 
  bases 
  of 
  the 
  antennae 
  ; 
  and 
  three 
  single 
  hairs 
  on 
  each 
  

   side 
  of 
  the 
  clypeus. 
  Ventrally 
  there 
  is 
  on 
  each 
  side 
  a 
  small 
  tuft 
  a 
  little 
  posterior 
  

   to 
  the 
  root 
  of 
  the 
  mandible 
  and 
  one 
  or 
  two 
  other 
  small 
  hairs. 
  

  

  Thorax. 
  Median 
  setae 
  rudimentary, 
  lateral 
  short 
  and 
  stout. 
  The 
  plumose, 
  or 
  

   more 
  correctly 
  serrated, 
  hairs 
  are 
  short 
  and 
  thick 
  with 
  relatively 
  stout 
  barbs 
  ; 
  

   some 
  of 
  them 
  are 
  branched. 
  All 
  the 
  setae, 
  except 
  the 
  most 
  minute 
  ones, 
  arise 
  from 
  

   chitinous 
  plates. 
  

  

  