﻿CHAETOTAXY 
  OF 
  PUPA 
  OF 
  STEGOMYIA 
  FASCIATA. 
  

  

  165 
  

  

  6. 
  A 
  series 
  of 
  setae 
  situated 
  near 
  by 
  and 
  anterior 
  to 
  the 
  setae 
  of 
  the 
  sub-lateral 
  

   row 
  (fig. 
  3, 
  B'). 
  

  

  7. 
  A 
  series 
  of 
  very 
  minute 
  setae, 
  the 
  anterior 
  dor 
  so-central 
  setae 
  (fig. 
  3, 
  D), 
  situated 
  

   near 
  the 
  anterior 
  margins 
  of 
  the 
  segments 
  almost 
  in 
  line 
  with 
  the 
  setae 
  of 
  the 
  sub- 
  

   median 
  row. 
  

  

  The 
  dorsal 
  abdominal 
  setae 
  may 
  now 
  be 
  described 
  as 
  they 
  occur 
  on 
  each 
  segment, 
  

   making 
  use 
  of 
  the 
  abbreviations 
  A, 
  A', 
  B, 
  B', 
  C, 
  C, 
  C", 
  and 
  D, 
  as 
  defined 
  above. 
  

  

  Segment 
  I. 
  

  

  There 
  are 
  eight 
  setae 
  on 
  each 
  side 
  of 
  the 
  first 
  segment 
  ; 
  unlike 
  those 
  on 
  the 
  more 
  

   posterior 
  segments 
  they 
  are 
  not 
  directed 
  backwards. 
  

  

  Dendritic 
  tuft. 
  In 
  the 
  middle 
  of 
  the 
  segment, 
  and 
  at 
  a 
  short 
  distance 
  from 
  the 
  

   middle 
  line, 
  is 
  a 
  large 
  seta 
  developed 
  into 
  a 
  dendritic 
  tuft, 
  which 
  arises 
  from 
  a 
  

   delicate 
  membrane 
  and 
  is 
  directed 
  upwards. 
  It 
  has 
  a 
  triangular 
  basal 
  portion 
  

  

  Fie: 
  

  

  Abdomen 
  of 
  pupa 
  of 
  Stegomyia 
  fas 
  data, 
  dorsal 
  view 
  ; 
  for 
  

   explanation 
  see 
  text. 
  

  

  which 
  gives 
  rise 
  to 
  a 
  number 
  of 
  stout 
  primary 
  branches, 
  seven 
  to 
  sixteen 
  in 
  number, 
  

   which 
  in 
  turn 
  divide 
  and 
  subdivide 
  repeatedly. 
  This 
  seta 
  may 
  correspond 
  to 
  C 
  on 
  

   the 
  more 
  distal 
  segments. 
  

  

  Antero-internal 
  seta. 
  A 
  long, 
  stout 
  seta 
  situated 
  immediately 
  anterior 
  to 
  the 
  

   dendritic 
  tuft, 
  and 
  directed 
  forwards 
  ; 
  single. 
  This 
  seta 
  may 
  correspond 
  to 
  C" 
  

   on 
  the 
  more 
  distal 
  segments. 
  

  

  Antero-external 
  seta. 
  A 
  stout 
  seta 
  of 
  greater 
  length 
  situated 
  close 
  to 
  the 
  antero- 
  

   internal 
  seta, 
  but 
  a 
  little 
  external 
  and 
  posterior 
  to 
  it 
  ; 
  directed 
  forwards 
  and 
  outwards; 
  

   usually 
  single, 
  sometimes 
  double. 
  This 
  seta 
  may 
  correspond 
  to 
  C 
  on 
  the 
  more 
  

   distal 
  segments. 
  

  

  Medio-internal 
  seta. 
  A 
  small 
  tuft 
  of 
  two 
  to 
  four 
  hairs 
  situated 
  near 
  the 
  anterior 
  

   margin 
  of 
  the 
  segment 
  about 
  half-way 
  between 
  the 
  antero-internal 
  seta 
  and 
  the 
  

   lateral 
  border 
  ; 
  directed 
  forwards 
  and 
  outwards. 
  This 
  seta 
  may 
  correspond 
  to 
  

   B' 
  on 
  the 
  more 
  distal 
  segments. 
  

  

  Medio-external 
  seta. 
  A 
  tuft 
  of 
  two 
  to 
  five 
  hairs, 
  rather 
  longer 
  than 
  the 
  medio- 
  

   internal 
  tuft 
  and 
  situated 
  close 
  to 
  it 
  but 
  slightly 
  posterior 
  and 
  external 
  ; 
  directed 
  

   forwards 
  and 
  outwards. 
  This 
  seta 
  may 
  correspond 
  to 
  B 
  on 
  the 
  more 
  distal 
  segments. 
  

  

  Posterior-internal 
  seta. 
  At 
  the 
  point 
  where 
  the 
  lateral 
  border 
  of 
  the 
  segment 
  

   begins 
  to 
  curve 
  inwards 
  there 
  is 
  a 
  group 
  of 
  three 
  setae 
  : 
  the 
  innermost 
  of 
  these 
  is 
  

  

  