﻿314 
  

  

  S. 
  A. 
  NEAVE. 
  

  

  as 
  is 
  the 
  case 
  with 
  other 
  species 
  found 
  in 
  running 
  water, 
  and 
  there 
  are 
  well-marked 
  

   hairs 
  on 
  the 
  syphon. 
  Though 
  invisible 
  in 
  preserved 
  specimens, 
  two 
  pseudopodia 
  

   of 
  considerable 
  length 
  are 
  present 
  immediately 
  anterior 
  to 
  the 
  anus. 
  The 
  pupa 
  

   is 
  a 
  clear 
  orange-yellow 
  colour 
  and 
  the 
  aster 
  is 
  remarkable 
  for 
  the 
  erectness 
  and 
  large 
  

   size 
  of 
  the 
  dorsal 
  pair 
  of 
  hooks, 
  especially 
  in 
  the 
  female. 
  The 
  dorso-lateral 
  comb 
  

   consists 
  of 
  a 
  few 
  fine 
  widely 
  spread 
  spines. 
  

  

  I 
  find 
  that 
  I 
  was 
  mistaken 
  in 
  a 
  former 
  paper 
  (he. 
  cit. 
  p. 
  296) 
  in 
  describing 
  the 
  eyes 
  

   as 
  dusky 
  purplish. 
  The 
  ground-colour 
  is 
  as 
  described, 
  but 
  it 
  is 
  crossed 
  in 
  the 
  female 
  

   eye 
  by 
  two 
  narrow 
  bars 
  of 
  greenish 
  iridescence, 
  one 
  such 
  bar 
  being 
  present 
  in 
  the 
  lower 
  

   small 
  -facetted 
  area 
  of 
  the 
  male 
  eye. 
  

  

  Tabanus 
  variabilis, 
  Lw. 
  

  

  This 
  species 
  is 
  not 
  a 
  rare 
  one 
  near 
  Mt. 
  Mlanje, 
  though 
  not 
  so 
  common 
  as 
  the 
  

   preceding. 
  It 
  occurs 
  on 
  the 
  wooded 
  streams 
  in 
  the 
  neighbourhood 
  of 
  the 
  mountain 
  

   in 
  October 
  and 
  November, 
  occasionally 
  later. 
  The 
  larvae 
  (Plate 
  xxviii, 
  fig. 
  17) 
  

   were 
  found 
  in 
  some 
  abundance 
  in 
  these 
  localities. 
  They 
  are 
  entirely 
  different 
  from 
  

   those 
  of 
  T. 
  atrimanus, 
  being 
  almost 
  colourless, 
  though 
  in 
  quite 
  mature 
  individuals 
  

   the 
  base 
  of 
  the 
  syphon 
  and 
  the 
  syphon 
  itself 
  are 
  of 
  an 
  orange 
  colour. 
  The 
  most 
  

   striking 
  peculiarity 
  of 
  this 
  larva 
  is, 
  however, 
  the 
  presence 
  of 
  a 
  distinct 
  papilla 
  of 
  

   a 
  dark 
  colour 
  on 
  each 
  side 
  of 
  the 
  anal 
  segment. 
  This 
  is 
  easily 
  recognisable 
  in 
  life 
  

   and 
  distinguishes 
  this 
  species 
  from 
  any 
  other 
  I 
  have 
  yet 
  seen. 
  The 
  anus 
  is 
  also 
  

   unusually 
  prominent. 
  

  

  Fig. 
  24. 
  Tabanus 
  variabilis, 
  Lw. 
  ; 
  (a, 
  a 
  1 
  ) 
  pupal 
  aster 
  and 
  dorso-lateral 
  comb 
  of 
  <J 
  ; 
  

   (&, 
  b) 
  pupal 
  aster 
  and 
  dorso-lateral 
  comb 
  of 
  $. 
  

  

  The 
  pupa 
  (Plate 
  xxviii, 
  fig. 
  16) 
  is 
  also 
  remarkable 
  for 
  its 
  dark 
  coloration, 
  

   especially 
  on 
  the 
  dorsum 
  of 
  the 
  thorax. 
  The 
  aster 
  is 
  characterised 
  by 
  the 
  large, 
  

   horizontally 
  extended 
  middle 
  pair 
  of 
  hooks, 
  and 
  its 
  outline 
  is 
  therefore 
  entirely 
  

   different 
  from 
  that 
  of 
  the 
  closely 
  allied 
  T. 
  atrimanus. 
  The 
  dorso-lateral 
  comb 
  

   consists 
  of 
  a 
  few 
  short 
  and 
  rather 
  stout 
  spines. 
  

  

  Tabanus 
  insignis, 
  Lw. 
  

  

  A 
  large 
  series 
  of 
  flies 
  resembling 
  this 
  species 
  was 
  obtained, 
  accompanied 
  by 
  an 
  

   equally 
  large 
  number 
  of 
  individuals 
  identical 
  with 
  the 
  type 
  of 
  T. 
  sharpei, 
  Aust., 
  and 
  

   a 
  great 
  variety 
  of 
  intermediates 
  between 
  the 
  two. 
  In 
  addition, 
  a 
  small 
  series 
  was 
  

  

  