﻿NOTES 
  ON 
  THE 
  ETHIOPIAN 
  FRUIT 
  FLIES, 
  OTHER 
  THAN 
  DACUS. 
  251 
  

  

  Ocnerioxa 
  discreta, 
  sp. 
  nov. 
  

  

  Yery 
  like 
  0. 
  woodi 
  from 
  Nyasaland, 
  but 
  more 
  slender, 
  smaller 
  and 
  distinguished 
  

   by 
  some 
  minor 
  details 
  in 
  the 
  coloration 
  of 
  the 
  head, 
  abdomen 
  and 
  wings. 
  

  

  (J. 
  Length 
  of 
  body 
  4 
  mm. 
  ; 
  of 
  wing 
  4*5 
  mm. 
  

  

  The 
  body 
  is 
  narrower 
  than 
  in 
  woodi, 
  the 
  thorax 
  measuring 
  about 
  1 
  mm. 
  only 
  

   in 
  breadth, 
  while 
  in 
  woodi 
  it 
  is 
  1'5 
  mm. 
  broad. 
  Besides 
  there 
  are 
  the 
  following 
  

   differences 
  : 
  (a) 
  the 
  occiput 
  has 
  only 
  the 
  two 
  lateral 
  black 
  stripes, 
  the 
  two 
  middle 
  

   ones 
  being 
  quite 
  absent; 
  (b) 
  the 
  frons 
  is 
  entirely 
  whitish, 
  even 
  above 
  the 
  roots 
  

   •of 
  antennae, 
  the 
  black 
  band 
  of 
  woodi 
  being 
  quite 
  wanting, 
  and 
  thus 
  the 
  white 
  

   lunula 
  is 
  not 
  conspicuous 
  ; 
  (c) 
  the 
  third 
  antennal 
  joint 
  is 
  not 
  at 
  all 
  infuscated 
  ; 
  

  

  (d) 
  the 
  black 
  transverse 
  band 
  at 
  the 
  upper 
  mouth-border 
  is 
  reduced 
  to 
  two 
  small 
  

   spots, 
  one 
  on 
  each 
  side 
  of 
  the 
  mouth-edges, 
  and 
  these 
  spots 
  are 
  moreover 
  dull 
  ; 
  

  

  (e) 
  the 
  jowls 
  are 
  entirely 
  whitish, 
  quite 
  destitute 
  of 
  the 
  fuscous 
  subocular 
  spot 
  ; 
  

  

  (f) 
  the 
  black 
  notopleural 
  stripe 
  is 
  narrower, 
  and 
  there 
  is 
  a 
  faint 
  indication 
  of 
  an 
  

   anterior 
  median 
  fuscous 
  stripe, 
  and 
  the 
  mesophragma 
  is 
  dark 
  reddish 
  in 
  the 
  middle 
  ; 
  

  

  (g) 
  the 
  abdomen 
  is 
  not 
  at 
  all 
  greenish, 
  and 
  has 
  the 
  fourth 
  segment 
  yellowish, 
  with 
  

   narrow 
  black 
  sides 
  and 
  hind 
  border 
  ; 
  (A) 
  the 
  wing 
  pattern 
  is 
  identical, 
  but 
  the 
  

   fuscous 
  tooth 
  below 
  the 
  outer 
  lower 
  angle 
  of 
  the 
  discoidal 
  cell 
  along 
  the 
  fifth 
  

   longitudinal 
  vein 
  is 
  much 
  shortened, 
  not 
  being 
  extended 
  to 
  the 
  hind 
  border 
  of 
  

   the 
  wing. 
  

  

  These 
  small 
  differences, 
  together 
  with 
  the 
  very 
  different 
  habitat, 
  may 
  be 
  con- 
  

   sidered 
  of 
  specific 
  value. 
  

  

  Type 
  (J, 
  a 
  single 
  specimen 
  from 
  N. 
  Nigeria, 
  Zungeru, 
  5.xi.l910 
  (Dr. 
  J. 
  W. 
  

   Scott 
  Macfie). 
  

  

  J§, 
  gen. 
  nov. 
  

  

  This 
  is 
  a 
  rather 
  aberrant 
  genus, 
  which 
  on 
  account 
  of 
  its 
  bare 
  third 
  longitudinal 
  

   vein, 
  black 
  and 
  strong 
  ocp. 
  and 
  its 
  general 
  appearance, 
  comes 
  in 
  the 
  vicinity 
  of 
  

   Aciura, 
  being 
  however 
  very 
  distinct 
  from 
  it 
  in 
  the 
  chaetotactic 
  characters, 
  as 
  well 
  

   as 
  in 
  the 
  wing 
  pattern. 
  

  

  Head 
  a 
  little 
  broader 
  than 
  the 
  thorax, 
  but 
  in 
  front 
  view 
  about 
  as 
  broad 
  as 
  high. 
  

   Occiput 
  distinctly 
  concave 
  above 
  the 
  neck, 
  and 
  less 
  prominent 
  below, 
  with 
  the 
  

   lateral 
  lower 
  swellings 
  but 
  little 
  developed. 
  Frons 
  flat 
  or 
  even 
  a 
  little 
  concave 
  

   before 
  the 
  lunula, 
  with 
  about 
  parallel 
  sides, 
  as 
  broad 
  as 
  one 
  eye, 
  only 
  a 
  little 
  longer 
  

   than 
  broad. 
  In 
  profile 
  the 
  frons 
  is 
  not 
  at 
  all 
  prominent, 
  not 
  even 
  above 
  the 
  

   antennae 
  ; 
  the 
  eyes 
  are 
  rounded, 
  with 
  the 
  vertical 
  diameter 
  only 
  a 
  little 
  longer. 
  

   Lunula 
  small. 
  Face 
  long, 
  only 
  a 
  little 
  narrower 
  but 
  distinctly 
  a 
  little 
  longer 
  than 
  

   the 
  frons 
  ; 
  it 
  is 
  about 
  parallel-sided, 
  flat, 
  with 
  no 
  prominent 
  mouth-border, 
  and 
  with 
  

   shallow 
  but 
  long 
  antennal 
  grooves. 
  Cheeks 
  linear 
  ; 
  jowls 
  very 
  narrow, 
  narrower 
  

   than 
  the 
  third 
  antennal 
  joint. 
  Antennae 
  inserted 
  distinctly 
  above 
  the 
  middle 
  

   of 
  the 
  eyes 
  ; 
  they 
  are 
  very 
  short, 
  not 
  extending 
  beyond 
  the 
  middle 
  of 
  the 
  face 
  ; 
  

   second 
  joint 
  not 
  prominent, 
  shortly 
  setulose 
  above, 
  destitute 
  of 
  long 
  bristles 
  ; 
  

   third 
  joint 
  pubescent, 
  attenuate 
  at 
  end 
  but 
  obtuse, 
  1J 
  times 
  as 
  long 
  as 
  broad 
  ; 
  

   arista 
  shortly 
  pubescent. 
  Palpi 
  and 
  proboscis 
  short, 
  retracted 
  into 
  the 
  oral 
  cavity. 
  

   Cephalic 
  bristles 
  very 
  strong 
  and 
  peculiarly 
  curved 
  ; 
  no 
  distinct 
  pvt. 
  ; 
  ocp. 
  numerous, 
  

  

  