﻿236 
  PROF. 
  M. 
  BEZZI. 
  

  

  before 
  the 
  middle 
  of 
  the 
  first 
  posterior 
  cell 
  ; 
  it 
  contains 
  two 
  rather 
  large 
  fuscous, 
  

   spots 
  on 
  the 
  fore 
  border 
  in 
  the 
  marginal 
  cell. 
  From 
  the 
  costal 
  band, 
  about 
  at 
  middle 
  

   of 
  the 
  last 
  portion 
  of 
  the 
  third 
  vein 
  or 
  a 
  little 
  beyond 
  it, 
  departs 
  the 
  fuscous 
  narrow 
  

   middle 
  band, 
  which, 
  crossing 
  obliquely 
  beyond 
  the 
  middle 
  of 
  the 
  last 
  portion 
  of 
  the 
  

   fourth 
  vein, 
  ends 
  at 
  the 
  hind 
  border 
  just 
  below 
  the 
  tip 
  of 
  the 
  fourth 
  vein 
  itself. 
  

   The 
  fuscous 
  cubital 
  band 
  is 
  about 
  twice 
  as 
  broad 
  as 
  the 
  middle 
  one 
  ; 
  it 
  begins 
  at 
  

   the 
  hind 
  border 
  of 
  the 
  wing 
  symmetrically 
  with 
  the 
  end 
  of 
  the 
  fifth 
  vein, 
  and 
  passing 
  

   over 
  the 
  hind 
  cross- 
  vein 
  fills 
  up 
  broadly 
  the 
  end 
  of 
  the 
  discoidal 
  cell, 
  and 
  ends, 
  more 
  

   pale-coloured, 
  in 
  the 
  first 
  posterior 
  cell, 
  but 
  without 
  reaching 
  either 
  the 
  basal 
  or 
  

   costal 
  band 
  ; 
  the 
  base 
  of 
  the 
  first 
  posterior 
  cell 
  is 
  thus 
  completely 
  hyaline. 
  The 
  

   broad 
  axillary 
  lobe 
  is 
  hyaline, 
  with 
  an 
  ill-defined 
  fuscous 
  middle 
  spot 
  ; 
  the 
  alula 
  is 
  

   quite 
  hyaline. 
  The 
  oblique 
  folds 
  in 
  the 
  discoidal 
  and 
  third 
  posterior 
  cells 
  are 
  about 
  

   as 
  dark 
  as 
  the 
  axillary 
  vein. 
  

  

  Type 
  J 
  and 
  type 
  $, 
  a 
  single 
  couple 
  of 
  specimens 
  from 
  British 
  East 
  Africa, 
  Kabete, 
  

   28.viii.1914 
  (T. 
  J. 
  Anderson). 
  

  

  Trirhithrum, 
  Bezzi, 
  1918. 
  

  

  The 
  peculiar 
  character 
  of 
  the 
  wing 
  pattern 
  in 
  the 
  present 
  genus 
  is 
  not 
  (as 
  wrongly 
  

   indicated 
  on 
  p. 
  233 
  of 
  my 
  previous 
  paper) 
  that 
  the 
  middle 
  band 
  is 
  united 
  to 
  the 
  

   marginal 
  one, 
  but 
  that 
  the 
  cubital 
  band 
  (or 
  the 
  band 
  on 
  the 
  hind 
  cross- 
  vein) 
  is 
  united 
  

   to 
  the 
  basal 
  or 
  anal 
  band. 
  Another 
  error 
  is 
  to 
  be 
  found 
  in 
  p. 
  239 
  in 
  the 
  description 
  

   of 
  the 
  new 
  species 
  Tr. 
  occipitale, 
  which 
  has 
  the 
  thorax 
  shining 
  black, 
  and 
  not 
  shining 
  

   yellowish. 
  

  

  To 
  the 
  present 
  genus 
  is 
  to 
  be 
  ascribed 
  also 
  Ceratitis 
  inscripta, 
  Graham, 
  which 
  

   is 
  the 
  same 
  as 
  T. 
  cqffeae, 
  Bezzi, 
  as 
  stated 
  by 
  Dr. 
  G. 
  A. 
  K. 
  Marshall 
  ; 
  and 
  the 
  following 
  

   very 
  distinct 
  and 
  robust 
  new 
  species, 
  which 
  seems 
  to 
  be 
  allied 
  to 
  T. 
  nitidum, 
  v. 
  

   Roeder, 
  in 
  having 
  a 
  complete 
  middle 
  band 
  on 
  the 
  wings. 
  

  

  Trirhithrum 
  valid 
  urn 
  sp. 
  nov. 
  

  

  A 
  robust 
  fly 
  of 
  comparatively 
  large 
  size, 
  entirely 
  shining 
  black, 
  with 
  whitish 
  

   mesopleural 
  stripe 
  and 
  whitish 
  scutellum, 
  and 
  with 
  a 
  complete 
  middle 
  band 
  on 
  the 
  

   wings, 
  which 
  have 
  also 
  rather 
  distinct 
  black 
  streaks 
  at 
  the 
  base. 
  

  

  ?. 
  Length 
  of 
  body 
  7*5 
  mm. 
  ; 
  of 
  ovipositor 
  1*5 
  mm. 
  ; 
  of 
  wing 
  8 
  mm. 
  

  

  Head 
  with 
  the 
  occiput 
  shining 
  reddish 
  in 
  the 
  middle 
  and 
  above, 
  black 
  on 
  the 
  

   sides 
  ; 
  frons 
  dull 
  yellowish, 
  face 
  whitish 
  on 
  its 
  lower 
  part, 
  jowls 
  reddish 
  like 
  the 
  

   lower 
  occipital 
  swellings, 
  which 
  are 
  shining 
  black 
  above. 
  The 
  frons 
  is 
  about 
  as 
  broad 
  

   as 
  long, 
  unspotted, 
  only 
  the 
  ocellar 
  and 
  the 
  narrow 
  and 
  short 
  orbital 
  plates 
  being 
  

   shining 
  reddish. 
  The 
  cheeks 
  are 
  whitish, 
  but 
  their 
  upper 
  half, 
  by 
  the 
  roots 
  of 
  the 
  

   antennae, 
  is 
  purplish. 
  Antennae 
  wanting 
  in 
  the 
  case 
  of 
  the 
  type. 
  Upper 
  half 
  of 
  

   the 
  face, 
  just 
  below 
  the 
  antennal 
  root, 
  blackish 
  and 
  grey-dusted. 
  Jowls 
  of 
  a 
  purple 
  

   colour, 
  with 
  a 
  dark 
  brown 
  spot 
  below 
  the 
  eye. 
  Palpi 
  and 
  proboscis 
  reddish 
  brown. 
  

   All 
  the 
  cephalic 
  bristles 
  are 
  black, 
  even 
  the 
  pvl. 
  and 
  the 
  genal 
  ones 
  ; 
  two 
  i. 
  or. 
  ; 
  

   oc. 
  very 
  strong 
  and 
  long 
  ; 
  occipital 
  hairs 
  black, 
  even 
  below 
  ; 
  mouth-border 
  on 
  the 
  

   sides 
  with 
  a 
  row 
  of 
  black 
  bristly 
  hairs. 
  Thorax 
  shining 
  black 
  on 
  the 
  back, 
  with 
  

   short 
  dense 
  black 
  pubescence 
  ; 
  humeri 
  black, 
  narrowly 
  reddish 
  brown 
  behind 
  ; 
  . 
  

  

  