﻿THE 
  TABANIDAE 
  OF 
  SOUTHERN 
  NYASALAND. 
  

  

  295 
  

  

  the 
  first 
  and 
  second 
  joints, 
  which 
  are 
  covered 
  with 
  long 
  hairs, 
  being 
  buff-coloured, 
  the 
  

   third 
  joint 
  dusky. 
  Eyes 
  of 
  both 
  sexes 
  dusky, 
  the 
  (J 
  head 
  holoptic 
  and 
  the 
  eyes 
  not 
  

   divided 
  into 
  areas 
  with 
  large 
  and 
  small 
  facets. 
  Thorax 
  dusky, 
  sparsely 
  covered 
  

  

  a 
  

  

  Fig. 
  1. 
  

  

  SHvim 
  apiformi*. 
  

  

  sp. 
  n. 
  : 
  side 
  view 
  

  

  of 
  head 
  of 
  $. 
  

  

  Fig. 
  2. 
  

   Antenna 
  of, 
  (a) 
  Silvius 
  apifcrmis. 
  sp. 
  n, 
  

   (b) 
  Silvius 
  montico 
  a, 
  sp. 
  n. 
  

  

  with 
  pale 
  buff 
  hairs. 
  Abdomen 
  bright 
  fulvous 
  yellow, 
  banded 
  with 
  black 
  as 
  shown 
  

   in 
  fig. 
  1, 
  the 
  median 
  spot 
  on 
  the 
  second 
  segment 
  varying 
  a 
  good 
  deal 
  in 
  size 
  in 
  

   different 
  individuals 
  and 
  especially 
  large 
  in 
  the 
  $. 
  Wings 
  hyaline, 
  with 
  a 
  strongly 
  

  

  Fig. 
  3. 
  Silvius 
  apiformis, 
  sp. 
  n., 
  $. 
  X 
  4. 
  

   marked 
  sepia-coloured 
  patch 
  at 
  the 
  base 
  extending 
  to 
  the 
  humeral 
  cross-vein 
  and 
  

   to 
  the 
  base 
  of 
  the 
  basal 
  cells 
  ; 
  the 
  somewhat 
  darkened 
  area 
  around 
  the 
  discal 
  cell 
  

   not 
  so 
  evident 
  to 
  the 
  naked 
  eye 
  as 
  it 
  is 
  indicated 
  in 
  the 
  figure. 
  Halter 
  es 
  dusky. 
  

   Legs 
  dusky, 
  except 
  for 
  proximal 
  two-thirds 
  of 
  tibiae, 
  which 
  are 
  whitish, 
  the 
  femora 
  

   in 
  some 
  individuals 
  having 
  a 
  somewhat 
  rufous 
  tint. 
  

  

  