﻿416 
  . 
  J. 
  W. 
  S. 
  MACFIE 
  AND 
  A, 
  INGRAM. 
  

  

  Thorax 
  broad, 
  about 
  1 
  mm., 
  bearing 
  large 
  tufts 
  of 
  subplumose 
  hairs 
  and 
  dorsally, 
  

   on 
  each 
  side 
  of 
  the 
  middle 
  third, 
  two 
  very 
  long 
  black 
  pubescent 
  hairs 
  which 
  reach 
  

   forwards 
  beyond 
  the 
  anterior 
  margin 
  of 
  the 
  head. 
  All 
  the 
  larger 
  thoracic 
  setae 
  

   arise 
  from 
  chitinised 
  tubercles. 
  

  

  Abdomen 
  not 
  very 
  hairy. 
  Lateral 
  abdominal 
  setae 
  long 
  and 
  triple 
  on 
  the 
  first 
  

   two 
  segments, 
  thereafter 
  single 
  and 
  smaller. 
  Comb 
  (fig. 
  5) 
  composed 
  of 
  about 
  a 
  

   dozen 
  spines 
  set 
  in 
  a 
  transverse 
  row 
  at 
  the 
  margin 
  of 
  a 
  large 
  chitinous 
  plate 
  on 
  the 
  

   lateral 
  aspect 
  of 
  the 
  eighth 
  segment, 
  the 
  spines 
  are 
  rather 
  feebly 
  chitinised, 
  and 
  have 
  

   a 
  large 
  pointed 
  median 
  barb 
  and 
  a 
  fringe 
  of 
  smaller 
  barbs 
  on 
  each 
  side 
  of 
  it. 
  The 
  

   siphonal 
  tuft 
  is 
  small 
  and 
  triple 
  ; 
  the 
  subsiphonal 
  large, 
  composed 
  of 
  about 
  five 
  

   plumose 
  hairs 
  ; 
  and 
  the 
  anal 
  single. 
  The 
  siphon 
  (fig. 
  5) 
  is 
  dark 
  and 
  rather 
  highly 
  

   chitinised, 
  length 
  (about 
  0-6 
  mm.) 
  nearly 
  four 
  times 
  the 
  basal 
  diameter, 
  bearing 
  a 
  

   pair 
  of 
  large 
  tufts 
  of 
  three 
  to 
  six 
  subplumose 
  hairs 
  a 
  little 
  beyond 
  the 
  middle, 
  and 
  

   tapering 
  slightly 
  distally 
  to 
  those 
  tufts. 
  The 
  pecten 
  commences 
  a 
  little 
  above 
  the 
  

   base 
  of 
  the 
  siphon, 
  extending 
  beyond 
  the 
  hair-tufts 
  to 
  about 
  two-thirds 
  of 
  the 
  length 
  

   of 
  the 
  siphon, 
  and 
  is 
  composed 
  of 
  from 
  fifteen 
  to 
  twenty 
  spines. 
  The 
  spines 
  are 
  feebly 
  

   chitinised, 
  barbed, 
  and 
  set 
  closely 
  together 
  in 
  a 
  row 
  ; 
  they 
  are 
  rather 
  difficult 
  to 
  see 
  

   since 
  they 
  do 
  not 
  stand 
  out 
  clearly, 
  the 
  surface 
  of 
  the 
  siphon 
  itself 
  being 
  marked 
  with 
  

   a 
  scale-like 
  development 
  of 
  the 
  chitin. 
  Anal 
  segment 
  highly 
  and 
  completely 
  chitinised, 
  

   about 
  as 
  long 
  as 
  broad. 
  On 
  each 
  side, 
  near 
  the 
  middle 
  of 
  the 
  posterior 
  margin, 
  is 
  

   a 
  large 
  double 
  pubescent 
  hair. 
  The 
  beard 
  is 
  very 
  poorly 
  developed. 
  The 
  dorsal 
  

   hairs 
  are, 
  however, 
  well 
  developed 
  and 
  very 
  long 
  (about 
  2 
  mm.), 
  one 
  above 
  and 
  one 
  

   or 
  two 
  below 
  on 
  each 
  side. 
  The 
  papillae 
  are 
  long, 
  subequal, 
  about 
  0-9 
  mm. 
  in 
  length, 
  

   and 
  nearly 
  four 
  times 
  as 
  long 
  as 
  the 
  anal 
  segment, 
  tapering 
  regularly 
  to 
  pointed 
  

   extremities. 
  

  

  Diagnosis. 
  — 
  This 
  larva 
  apparently 
  resembles 
  that 
  of 
  U. 
  nigripes, 
  to 
  which 
  brief 
  

   reference 
  has 
  been 
  made 
  by 
  Edwards 
  (Bull. 
  Ent. 
  Res. 
  vii, 
  p 
  15, 
  footnote), 
  both 
  in 
  

   the 
  position 
  of 
  the 
  frontal 
  hairs 
  and 
  in 
  the 
  number 
  and 
  form 
  of 
  the 
  comb-scales. 
  

   One 
  character 
  mentioned 
  by 
  Edwards 
  that 
  may 
  serve 
  for 
  differentiation 
  is 
  the 
  

   length 
  of 
  the 
  anal 
  papillae, 
  which 
  are 
  apparently 
  considerably 
  longer 
  in 
  U. 
  inornata. 
  

  

  Pupa. 
  — 
  -The 
  pupa 
  is 
  small, 
  length 
  about 
  3-5 
  mm. 
  when 
  extended, 
  highly, 
  

   chitinised, 
  and 
  very 
  dark-coloured. 
  The 
  following 
  description 
  is 
  based 
  on 
  the 
  

   examination 
  of 
  a 
  single 
  pelt. 
  

  

  Cephalothorax 
  very 
  dark. 
  Respiratory 
  trumpets 
  (fig. 
  6, 
  a) 
  very 
  dark, 
  short, 
  

   length 
  about 
  0-3 
  mm., 
  straight, 
  with 
  a 
  rather 
  small 
  opening; 
  ratio 
  of 
  the 
  length 
  

   of 
  the 
  meatus 
  to 
  the 
  total 
  length 
  of 
  the 
  trumpet 
  about 
  1 
  to 
  1-3. 
  Cephalothoracic 
  

   setae 
  well 
  developed 
  ; 
  dorsal 
  setae 
  forming 
  tufts 
  of 
  about 
  five 
  hairs. 
  

  

  Abdomen 
  (fig. 
  6, 
  b) 
  not 
  so 
  dark 
  as 
  the 
  cephalothorax. 
  Paddles 
  of 
  the 
  somewhat 
  

   triangular 
  shape 
  characteristic 
  of 
  the 
  genus, 
  length 
  about 
  0-5 
  mm., 
  greatest 
  breadth 
  

   about 
  0-34 
  mm., 
  ratio 
  1 
  -4 
  to 
  1. 
  The 
  midrib 
  is 
  well 
  developed, 
  the 
  external 
  buttress 
  

   almost 
  indistinguishable 
  ; 
  the 
  distal 
  half 
  of 
  the 
  paddles 
  bears 
  on 
  both 
  inner 
  and 
  outer 
  

   margins 
  small 
  denticules 
  or 
  fimbriae. 
  The 
  single 
  seta 
  at 
  the 
  distal 
  end 
  of 
  the 
  midrib 
  

   is 
  short, 
  length 
  about 
  85^, 
  stout, 
  slightly 
  curved 
  at 
  its 
  end. 
  

  

  The 
  arrangement 
  of 
  the 
  abdominal 
  setae, 
  except 
  in 
  the 
  following 
  instances, 
  

   calls 
  for 
  no 
  special 
  mention. 
  The 
  lateral 
  setae 
  (A) 
  on 
  segment 
  viii 
  are 
  large 
  tufts, 
  

   about 
  half 
  the 
  length 
  of 
  the 
  paddles, 
  composed 
  of 
  nine 
  subplumose 
  hairs 
  which 
  are 
  

   occasionally 
  branched 
  at 
  their 
  tips 
  ; 
  on 
  segment 
  vii 
  small, 
  insignificant 
  tufts 
  of 
  two 
  

   or 
  three 
  hairs 
  ; 
  on 
  segments 
  v 
  and 
  vi 
  long 
  single 
  hairs 
  ; 
  and 
  on 
  segments 
  iii 
  and 
  iv 
  

   similar 
  but 
  shorter 
  and 
  more 
  delicate 
  single 
  hairs. 
  The 
  sublateral 
  setae 
  (B) 
  on 
  

   segments 
  iv 
  to 
  vi 
  are 
  long, 
  single 
  or 
  double, 
  reaching 
  across 
  the 
  following 
  segments 
  

   or 
  further 
  ; 
  on 
  segment 
  vii 
  they 
  are 
  smaller, 
  reaching 
  only 
  about 
  half-way 
  across 
  

   the 
  eighth 
  segment. 
  The 
  submedian 
  setae 
  (C) 
  on 
  segments 
  iv 
  and 
  v 
  are 
  long, 
  single 
  

   hairs, 
  reaching 
  beyond 
  the 
  posterior 
  margin 
  of 
  the 
  following 
  segments 
  ; 
  on 
  segments 
  

  

  