﻿Species 
  of 
  African 
  Butterflies. 
  137 
  

  

  Iolaus 
  silanus. 
  

  

  Male. 
  — 
  Upperside. 
  Both 
  wings 
  bright 
  blue. 
  Anterior 
  

   wings 
  : 
  apical 
  third, 
  from 
  the 
  middle 
  of 
  the 
  costa 
  down 
  to 
  

   the 
  end 
  of 
  the 
  lowest 
  median 
  nervule, 
  black, 
  whence 
  to 
  the 
  

   inner 
  angle 
  the 
  margin 
  is 
  narrowly 
  black 
  ; 
  shoulder 
  grey. 
  

   Posterior 
  wings 
  with 
  black 
  apex 
  and 
  margins 
  narrowly 
  so 
  ; 
  

   cilia 
  white 
  ; 
  costal 
  margins 
  white, 
  the 
  costal, 
  shining, 
  circular 
  

   space 
  steel-grey 
  ; 
  a 
  black 
  spot 
  crowned 
  with 
  red 
  at 
  the 
  anal 
  

   angle, 
  above 
  which, 
  extending 
  inwardly, 
  is 
  a 
  rather 
  short, 
  

   black, 
  linear 
  marking 
  and 
  two 
  small 
  black 
  spots 
  below 
  it 
  

   near 
  the 
  margin 
  between 
  the 
  tails. 
  

  

  Underside 
  silvery 
  white. 
  Anterior 
  wings 
  with 
  a 
  narrow 
  

   black 
  line 
  across 
  the 
  end 
  of 
  the 
  cell, 
  beyond 
  this 
  another 
  

   black 
  line 
  extending 
  from 
  near 
  the 
  costa 
  two 
  thirds 
  across 
  the 
  

   wings, 
  outside 
  which 
  and 
  extending 
  rather 
  lower 
  down 
  the 
  

   wing 
  is 
  an 
  interrupted 
  faint 
  black 
  line. 
  Posterior 
  wings 
  with 
  

   a 
  narrow 
  black 
  line 
  beyond 
  the 
  middle, 
  curving 
  at 
  the 
  lower 
  

   end 
  to 
  the 
  inner 
  margin, 
  between 
  which 
  and 
  the 
  outer 
  mar- 
  

   gin 
  is 
  another 
  line, 
  interrupted 
  near 
  the 
  anal 
  angle 
  by 
  two 
  

   spots, 
  that 
  nearest 
  the 
  angle 
  metallic 
  blue 
  on 
  the 
  margin, 
  

   above 
  black, 
  the 
  other 
  between 
  the 
  second 
  and 
  third 
  tail 
  

   black, 
  both 
  spots 
  and 
  the 
  space 
  above 
  and 
  between 
  crowned 
  

   with 
  yellowish 
  red 
  ; 
  an 
  interrupted 
  faint 
  black 
  line 
  near 
  the 
  

   outer 
  margin 
  between 
  the 
  upper 
  spot 
  and 
  the 
  apex 
  ; 
  margins 
  

   and 
  tails 
  black, 
  the 
  latter 
  tipped 
  with 
  white, 
  cilia 
  white. 
  

  

  Female. 
  — 
  Upperside. 
  Anterior 
  wings 
  pale 
  blue, 
  shaded 
  

   with 
  grey 
  towards 
  the 
  base 
  and 
  white 
  in 
  the 
  middle 
  ; 
  apical 
  

   third 
  greyish 
  black 
  ; 
  shoulder 
  grey. 
  Posterior 
  wings 
  : 
  the 
  

   lower 
  three 
  fourths 
  blue, 
  shaded 
  with 
  grey 
  and 
  mottled 
  with 
  

   white 
  towards 
  the 
  outer 
  margin 
  ; 
  the 
  costal 
  and 
  apical 
  region 
  

   grey 
  ; 
  the 
  innermost 
  dark 
  line 
  on 
  the 
  underside 
  is 
  represented 
  

   by 
  an 
  undulated, 
  narrow, 
  dark 
  grey 
  line 
  across 
  the 
  disk 
  be- 
  

   yond 
  the 
  middle, 
  curving 
  at 
  the 
  bottom 
  towards 
  the 
  inner 
  

   margin 
  until 
  it 
  merges 
  in 
  a 
  greyish-black, 
  rather 
  broad 
  band, 
  

   which 
  crosses 
  the 
  lower 
  end 
  of 
  the 
  wings 
  ; 
  a 
  black 
  spot 
  at 
  

   the 
  anal 
  angle 
  crowned 
  with 
  red 
  ; 
  two 
  rather 
  broad 
  blackish 
  

   bars 
  between 
  the 
  tails, 
  a 
  narrow 
  white 
  line 
  inside 
  the 
  

   black 
  outer 
  margin. 
  

  

  Underside 
  as 
  in 
  the 
  male, 
  but 
  the 
  lines 
  rather 
  more 
  distinct. 
  

  

  Expanse 
  of 
  wings, 
  <J 
  1|, 
  ? 
  If 
  inch. 
  

  

  Near 
  to 
  silas, 
  Westw., 
  and 
  silarus, 
  Druce, 
  but 
  has, 
  on 
  the 
  

   underside, 
  a 
  black 
  line 
  at 
  the 
  end 
  of 
  the 
  cell 
  on 
  anterior 
  wings 
  

   and 
  an 
  additional 
  discal 
  line 
  on 
  both 
  wings 
  ; 
  the 
  male 
  is 
  a 
  

   lighter 
  blue 
  on 
  the 
  upperside, 
  and 
  the 
  females 
  are 
  different. 
  

  

  Ann. 
  & 
  Mag. 
  N. 
  Hist. 
  Ser. 
  6. 
  Vol. 
  iii. 
  10 
  

  

  