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  266 
  PROF. 
  M. 
  BEZZI. 
  

  

  and 
  subquadrate, 
  the 
  second 
  much 
  narrower 
  and 
  subtriangular 
  ; 
  in 
  the 
  sub- 
  

   marginal 
  cell 
  there 
  are 
  three 
  rounded 
  spots, 
  one 
  in 
  the 
  middle 
  just 
  above 
  the 
  upper 
  

   end 
  of 
  the 
  small 
  cross- 
  vein 
  and 
  at 
  the 
  inner 
  end 
  of 
  the 
  upper 
  part 
  of 
  the 
  yellowish 
  

   patch, 
  the 
  other 
  at 
  the 
  fore 
  border 
  just 
  below 
  the 
  tip 
  of 
  the 
  2nd 
  vein, 
  the 
  third 
  

   of 
  greater 
  size 
  and 
  subtriangular 
  just 
  before 
  the 
  lower 
  apical 
  angle. 
  The 
  first 
  

   posterior 
  cell 
  has 
  a 
  rounded 
  spot 
  near 
  the 
  base, 
  half 
  as 
  broad 
  as 
  the 
  distance 
  

   between 
  the 
  3rd 
  and 
  4th 
  veins 
  and 
  in 
  contact 
  with 
  this 
  last 
  vein 
  before 
  the 
  upper 
  

   end 
  of 
  the 
  hind 
  cross-vein 
  ; 
  two 
  other 
  spots 
  before 
  the 
  end, 
  one 
  over 
  the 
  other, 
  

   that 
  in 
  contact 
  with 
  the 
  3rd 
  vein 
  being 
  smaller 
  than 
  that 
  in 
  contact 
  with 
  the 
  

   4th 
  ; 
  and 
  one 
  apical, 
  extending 
  from 
  the 
  3rd 
  to 
  the 
  4th 
  vein, 
  and 
  thus 
  forming 
  

   the 
  normal 
  apical 
  dark 
  fork 
  of 
  the 
  Trypanea-ip&ttem, 
  though 
  a 
  little 
  shorter 
  than 
  

   usual. 
  Discoidal 
  cell 
  with 
  four 
  about 
  equally 
  small, 
  rounded 
  spots, 
  disposed 
  as 
  

   a 
  square. 
  Second 
  posterior 
  cell 
  with 
  three 
  larger 
  rounded 
  spots 
  along 
  the 
  hind 
  

   border, 
  of 
  an 
  indentation-like 
  shape, 
  and 
  one 
  of 
  equal 
  size 
  near 
  its 
  upper 
  inner 
  

   angle. 
  Third 
  posterior 
  cell 
  with 
  a 
  single 
  rounded 
  spot 
  of 
  greater 
  size 
  before 
  its 
  lower 
  

   apical 
  angle 
  and 
  in 
  contact 
  with 
  the 
  hind 
  border 
  of 
  the 
  wing. 
  

  

  Type 
  (J, 
  a 
  single 
  specimen 
  from 
  the 
  Gold 
  Coast, 
  Aburi, 
  1912-13 
  (W 
  . 
  H. 
  Patterson). 
  

  

  Owing 
  to 
  the 
  great 
  affinity 
  of 
  the 
  present 
  species 
  with 
  T. 
  guimari, 
  which 
  shows 
  

   a 
  very 
  remarkable 
  sexual 
  dimorphism, 
  it 
  is 
  possible 
  that 
  the 
  unknown 
  female 
  

   has 
  a 
  somewhat 
  different 
  wing 
  pattern. 
  These 
  two 
  species, 
  like 
  T. 
  peregrina, 
  

   belong 
  evidently 
  to 
  the 
  gnaphalii-mamulae 
  group. 
  

  

  V. 
  Subfam. 
  Schistopterinae. 
  

  

  This 
  peculiar 
  subfamily 
  is 
  represented 
  in 
  the 
  new 
  material 
  before 
  me 
  by 
  two 
  

   remarkable 
  forms, 
  one 
  of 
  which 
  requires 
  the 
  formation 
  of 
  a 
  new 
  genus, 
  while 
  the 
  

   other, 
  being 
  closely 
  allied 
  to 
  Rhabdochaeta 
  spinosa, 
  Lamb 
  (1914), 
  from 
  the 
  

   Seychelles, 
  may 
  be 
  provisionally 
  placed 
  in 
  the 
  Oriental 
  genus 
  Rhabdochaeta, 
  de 
  Meij 
  . 
  

  

  An 
  important 
  character 
  of 
  the 
  subfamily 
  is 
  that 
  the 
  s. 
  or. 
  are 
  placed 
  on 
  a 
  fine 
  

   converging 
  towards 
  the 
  centre 
  of 
  the 
  frons, 
  being 
  thus 
  not 
  in 
  the 
  same 
  line 
  with 
  

   the 
  i. 
  or. 
  

  

  Perirhithrum, 
  gen. 
  nov. 
  

  

  This 
  new 
  genus 
  is 
  more 
  closely 
  allied 
  to 
  the 
  Oriental 
  Rhabdochaeta 
  than 
  to 
  the 
  

   Ethiopian 
  genera 
  Schistopterwn 
  or 
  Rhochmopterum, 
  but 
  differs 
  from 
  all 
  the 
  known 
  

   genera 
  of 
  the 
  subfamily 
  in 
  having 
  the 
  first 
  and 
  third 
  longitudinal 
  veins 
  bristly 
  

   above, 
  in 
  having 
  a 
  produced 
  lower 
  angle 
  in 
  the 
  anal 
  cell 
  and 
  in 
  having 
  a 
  very 
  

   oblique 
  hind 
  cross-vein. 
  

  

  From 
  Rhabdochaeta 
  the 
  new 
  genus 
  differs 
  in 
  the 
  want 
  of 
  the 
  middle 
  pair 
  of 
  bristles 
  

   on 
  the 
  frontal 
  stripe. 
  These 
  bristles 
  are 
  likewise 
  wanting 
  in 
  Schistopterum 
  and 
  are 
  

   not 
  mentioned 
  for 
  Rhochmopterum 
  ; 
  they 
  are 
  recorded 
  for 
  the 
  type 
  species 
  of 
  the 
  

   genus 
  Rhabdochaeta, 
  as 
  well 
  as 
  for 
  the 
  species 
  spinosa, 
  Lamb, 
  and 
  are 
  present 
  also 
  

   in 
  my 
  species 
  bakeri 
  from 
  the 
  Philippines. 
  This 
  pair 
  of 
  bristles 
  seems 
  to 
  correspond 
  

   to 
  the 
  crossed 
  frontal 
  pair 
  of 
  the 
  Anthomyiidae 
  : 
  but 
  in 
  Rhabdochaeta 
  they 
  are 
  not 
  

   crossed. 
  It 
  is 
  interesting 
  to 
  note 
  the 
  presence 
  of 
  a 
  similar 
  pair 
  of 
  bristles 
  in 
  the 
  

   male 
  of 
  Euribia 
  perpallida, 
  Bezzi 
  (as 
  pointed 
  out 
  by 
  me 
  in 
  vol. 
  ix, 
  p. 
  35, 
  note), 
  

   the 
  wing-pattern 
  of 
  which 
  rather 
  recalls 
  that 
  of 
  the 
  Schistopterinae. 
  

  

  