﻿THE 
  TABANIDAE 
  OF 
  SOUTHERN 
  NYASALAND. 
  

  

  301 
  

  

  Abdomen 
  with 
  the 
  two 
  anterior 
  segments 
  pale 
  yellow, 
  marked 
  with 
  black 
  as 
  shown 
  

   in 
  fig. 
  9 
  ; 
  the 
  remaining 
  segments 
  rufous 
  brown 
  ; 
  the 
  anterior 
  pair 
  of 
  black 
  spots 
  

   are 
  elongated 
  transversely 
  and 
  meet 
  in 
  the 
  middle 
  line 
  to 
  form 
  a 
  band 
  ; 
  the 
  posterior 
  

   pair 
  of 
  spots 
  on 
  the 
  second 
  segment 
  are 
  somewhat 
  elongate 
  longitudinally. 
  Wing 
  

   with 
  the 
  costal 
  cells 
  yellowish 
  brown, 
  the 
  remainder 
  dusky, 
  except 
  for 
  the 
  two 
  

   basal 
  and 
  the 
  anal 
  cells 
  which 
  are 
  hyaline, 
  and 
  the 
  axillary 
  cell 
  which 
  is 
  only 
  lightly 
  

   dusted 
  with 
  dark 
  scales 
  (the 
  type, 
  having 
  been 
  bred, 
  has 
  the 
  pigmentation 
  of 
  the 
  

   wing 
  somewhat 
  paler 
  than 
  is 
  the 
  case 
  in 
  a 
  collected 
  example) 
  ; 
  the 
  halteres 
  dark 
  

   brown. 
  Legs 
  reddish 
  brown. 
  

  

  There 
  is 
  no 
  marked 
  difference 
  between 
  the 
  sexes 
  in 
  this 
  species 
  ; 
  the^eyes 
  of 
  

   the 
  male, 
  as 
  in 
  others 
  of 
  this 
  group, 
  are 
  very 
  large, 
  the 
  upper 
  facets 
  being 
  of 
  a 
  

   golden-yellow 
  colour, 
  with 
  two 
  somewhat 
  curved, 
  horizontal 
  black 
  streaks. 
  

  

  Fig. 
  10. 
  Pupal 
  aster 
  of 
  Chrysops 
  bimaculosa, 
  sp. 
  n. 
  

   (a) 
  $, 
  (b) 
  $, 
  (&') 
  $ 
  side-view. 
  X 
  35. 
  

  

  Nyasaland 
  : 
  Mt. 
  Mlanje, 
  types 
  £ 
  and 
  $ 
  and 
  one 
  other 
  of 
  each 
  sex 
  bred 
  October 
  

   and 
  November 
  1913 
  ; 
  one 
  $ 
  collected 
  in 
  November 
  1912. 
  

  

  Of 
  the 
  four 
  above-mentioned 
  bred 
  individuals 
  three 
  were 
  bred 
  from 
  collected 
  

   pupae 
  and 
  the 
  fourth 
  from 
  a 
  larva, 
  which 
  much 
  resembled 
  that 
  of 
  Chrysojps 
  

   longicornis, 
  though 
  considerably 
  larger, 
  with 
  a 
  somewhat 
  less 
  strongly 
  pigmented 
  

   anal 
  segment 
  and 
  with 
  well-marked 
  hairs 
  on 
  the 
  syphon. 
  

  

  The 
  hooks 
  of 
  the 
  pupal 
  aster, 
  especially 
  the 
  upper 
  and 
  middle 
  pairs, 
  are 
  

   decidedly 
  elongate. 
  

  

  This 
  is 
  evidently 
  a 
  rare 
  species, 
  and 
  the 
  above 
  were 
  the 
  only 
  specimens 
  met 
  

   with, 
  the 
  one 
  imago, 
  as 
  well 
  as 
  the 
  larvae 
  and 
  pupae, 
  having 
  been 
  taken 
  on 
  the 
  

   banks 
  of 
  a 
  forested 
  stream. 
  

  

  Chrysops 
  woodi, 
  sp. 
  nov. 
  

  

  This 
  species, 
  together 
  with 
  the 
  following 
  one, 
  seem 
  to 
  form 
  a 
  distinct 
  group 
  

   among 
  the 
  African 
  representatives 
  of 
  this 
  genus. 
  They 
  are 
  characterised 
  by 
  their 
  

   brilliant 
  orange 
  or 
  yellow 
  coloration, 
  the 
  peculiar 
  arrangement 
  of 
  the 
  wing-markings 
  

   and 
  the 
  very 
  marked 
  expansion 
  of 
  the 
  first 
  joint 
  of 
  the 
  antenna. 
  

  

  <J. 
  — 
  Length 
  (one 
  specimen), 
  10*5 
  mm. 
  ; 
  length 
  of 
  wing, 
  8' 
  5 
  mm. 
  

  

  $. 
  — 
  Length 
  (two 
  specimens), 
  10*5-11 
  mm. 
  ; 
  length 
  of 
  wing, 
  9*5 
  mm. 
  

  

  Head 
  orange-rufous 
  ; 
  ocellar 
  triangle 
  black 
  ; 
  frontal 
  callus 
  large, 
  prominent 
  and 
  

   shining, 
  orange-rufous 
  ; 
  a 
  median 
  orange-rufous 
  facial 
  tubercle 
  ; 
  smaller 
  laterally- 
  

  

  