﻿414 
  

  

  j. 
  w. 
  

  

  MACFIE 
  AND 
  A. 
  INGRAM. 
  

  

  Pupa. 
  — 
  The 
  pupa 
  is 
  small, 
  length 
  about 
  2-8 
  mm. 
  when 
  extended, 
  not 
  very 
  

   highly 
  chitinised 
  but 
  partly 
  infuscated. 
  The 
  following 
  description 
  is 
  based 
  on 
  the 
  

   examination 
  of 
  two 
  (male 
  and 
  female) 
  pelts. 
  

  

  Cephalothorax 
  infuscated 
  anteriorly 
  and 
  posteriorly. 
  Respiratory 
  trumpets 
  

   (fig. 
  4, 
  a) 
  somewhat 
  infuscated 
  at 
  base 
  and 
  apex, 
  short, 
  length 
  about 
  0-3 
  mm., 
  

   straight, 
  with 
  moderately 
  wide 
  openings 
  ; 
  ratio 
  of 
  length 
  of 
  meatus 
  to 
  total 
  length 
  

   of 
  trumpet 
  about 
  1 
  to 
  1/4. 
  Cephalothoracic 
  setae 
  well 
  developed 
  and 
  arranged 
  as 
  

   usual 
  ; 
  dorsal 
  setae 
  tufts 
  of 
  about 
  six 
  hairs. 
  

  

  Abdomen 
  (fig. 
  4) 
  slightly 
  infuscated, 
  especially 
  the 
  sixth 
  and 
  seventh 
  segments. 
  

   Paddles 
  of 
  the 
  shape 
  characteristic 
  of 
  the 
  genus 
  ; 
  length 
  about 
  0-43 
  mm., 
  greatest 
  

   breadth 
  about 
  0-26 
  mm., 
  ratio 
  1 
  -6 
  to 
  1. 
  The 
  midrib 
  and 
  external 
  buttress 
  are 
  well 
  

   developed, 
  and 
  the 
  distal 
  half 
  of 
  the 
  paddle" 
  is 
  fringed 
  with 
  small 
  denticles, 
  which 
  

   are 
  largest 
  and 
  strongest 
  on 
  the 
  outer 
  border. 
  The 
  single 
  seta 
  at 
  the 
  distal 
  end 
  of 
  

   the 
  midrib 
  is 
  very 
  small. 
  

  

  Fig. 
  4. 
  Uranotaenia 
  balfouri, 
  Theo., 
  dorsal 
  view 
  of 
  abdomen 
  of 
  pupa 
  

  

  a, 
  respiratory 
  trumpet. 
  

  

  The 
  dorsal 
  abdominal 
  setae 
  are 
  moderately 
  well 
  developed. 
  The 
  lateral 
  setae 
  

   (A) 
  on 
  segment 
  viii 
  are 
  small, 
  inconspicuous 
  tufts 
  composed 
  of 
  four 
  very 
  delicate 
  

   hairs 
  ; 
  on 
  segment 
  vii 
  a 
  rather 
  long, 
  delicate 
  hair 
  sub-divided 
  at 
  its 
  end 
  ; 
  and 
  on 
  

   segments 
  iii 
  to 
  vi 
  tufts 
  of 
  usually 
  four 
  hairs, 
  which 
  are 
  long 
  and 
  delicate. 
  The 
  sub- 
  

   lateral 
  setae 
  (B) 
  on 
  segments 
  iv 
  to 
  vii 
  are 
  tufts 
  of 
  about 
  six 
  to 
  ten 
  long, 
  delicate 
  

   hairs 
  (the 
  more 
  anterior 
  segments 
  bearing 
  the 
  larger 
  tufts), 
  which 
  reach 
  across 
  to 
  

   near 
  the 
  posterior 
  margin 
  of 
  the 
  following 
  segment. 
  The 
  submedian 
  setae 
  (C) 
  on 
  

   segments 
  iii 
  to 
  vii 
  are 
  long 
  tufts 
  of 
  delicate 
  hairs 
  similar 
  to 
  the 
  sublateral 
  setae. 
  

   The 
  dendritic 
  tufts 
  on 
  segment 
  ii 
  are 
  moderately 
  large 
  ; 
  those 
  on 
  segment 
  i 
  are 
  well 
  

   developed 
  and 
  composed 
  of 
  about 
  a 
  dozen 
  primary 
  branches 
  which 
  are 
  subplumose 
  

   but 
  not 
  greatly 
  branched. 
  

  

  Habitat. 
  — 
  Accra, 
  and 
  Ofako, 
  a 
  village 
  about 
  nine 
  miles 
  north 
  of 
  Accra 
  on 
  the 
  road 
  

   to 
  Nsawam, 
  v. 
  1922. 
  At 
  both 
  places 
  the 
  larvae 
  were 
  found 
  in 
  pools 
  covered 
  by 
  

   the 
  water-weed, 
  Pistia 
  stratiotes. 
  The 
  larvae 
  in 
  appearance, 
  in 
  habits, 
  and 
  in 
  the 
  

   position 
  they 
  assumed 
  at 
  the 
  surface 
  of 
  the 
  water, 
  resembled 
  young 
  larvae 
  of 
  

   Mimomyia 
  splendens, 
  but 
  could 
  be 
  distinguished 
  with 
  the 
  aid 
  of 
  a 
  hand 
  lens 
  by 
  the 
  

   smaller 
  size 
  of 
  the 
  head. 
  

  

  