﻿248 
  PROF. 
  M. 
  BEZZI. 
  

  

  Ocneros, 
  0. 
  G. 
  Costa, 
  1844. 
  

  

  In 
  the 
  typical 
  species 
  of 
  the 
  present 
  genus 
  the 
  dc. 
  are 
  placed 
  near 
  the 
  suture, 
  

   while 
  in 
  the 
  known 
  Ethiopian 
  species 
  they 
  are 
  placed 
  much 
  behind. 
  It 
  seems 
  

   thus 
  probable 
  that 
  the 
  latter 
  species 
  are 
  not 
  congeneric 
  with 
  the 
  palaearctic 
  ones 
  ; 
  

   but 
  I 
  have 
  not 
  erected 
  a 
  special 
  genus 
  for 
  them, 
  because 
  they 
  may 
  perhaps 
  be 
  

   better 
  placed 
  in 
  the 
  following 
  genus 
  Ocnerioxa, 
  which 
  differs 
  only 
  in 
  the 
  non- 
  

   bristly 
  third 
  longitudinal 
  vein. 
  

  

  The 
  genus 
  seems 
  to 
  be 
  abundantly 
  represented 
  in 
  the 
  Ethiopian 
  fauna 
  ; 
  I 
  have 
  

   before 
  me 
  two 
  additional 
  new 
  species, 
  which 
  belong 
  to 
  the 
  group 
  of 
  0. 
  sinuatus. 
  

   This 
  group 
  is 
  not 
  only 
  distinguished 
  by 
  its 
  colour 
  characters, 
  but 
  also 
  

   by 
  the 
  slender 
  body, 
  the 
  longer 
  antennae 
  (which 
  are 
  nearly 
  extended 
  to 
  the 
  mouth- 
  

   border), 
  the 
  distinctly 
  pubescent 
  arista, 
  the 
  thin 
  and 
  prevalently 
  yellow 
  

   macrochaetae 
  of 
  the 
  head, 
  thorax 
  and 
  scutellum, 
  the 
  longer 
  pterostigma, 
  and 
  

   by 
  the 
  last 
  portion 
  of 
  fourth 
  longitudinal 
  vein 
  being 
  quite 
  straight. 
  To 
  the 
  

   characters 
  of 
  the 
  genus 
  must 
  be 
  added 
  that 
  the 
  i. 
  or. 
  are 
  accompanied 
  by 
  

   additional 
  bristly 
  hairs. 
  

  

  The 
  known 
  species 
  may 
  be 
  distinguished, 
  by 
  a 
  modification 
  of 
  the 
  table 
  on 
  p. 
  250 
  

   of 
  my 
  first 
  paper, 
  as 
  follows 
  : 
  — 
  

  

  1(2). 
  Scutellum 
  entirely 
  yellow; 
  discoidal 
  cell 
  wholly 
  infuscated, 
  without 
  hyaline] 
  

   spots 
  ; 
  stigma 
  as 
  long 
  as 
  or 
  longer 
  than 
  the 
  second 
  costal 
  cell 
  ; 
  antennae 
  ] 
  

   about 
  as 
  long 
  as 
  the 
  face, 
  with 
  a 
  shortly 
  pubescent 
  arista; 
  macrochaetae 
  \ 
  

   mostly 
  yellow. 
  

  

  a(d). 
  Base 
  of 
  stigma 
  narrowly 
  hyaline, 
  at 
  least 
  near 
  the 
  costa; 
  there 
  is 
  a 
  small 
  

   hyaline 
  dot 
  in 
  the 
  base 
  of 
  the 
  first 
  posterior 
  cell, 
  just 
  above 
  the 
  hind 
  cross- 
  

   vein. 
  

  

  6(c). 
  Hyaline 
  spot 
  in 
  the 
  marginal 
  cell 
  beyond 
  the 
  stigma 
  triangular 
  and 
  extended 
  

   to 
  the 
  second 
  longitudinal 
  vein 
  ; 
  the 
  fuscous 
  portion 
  of 
  the 
  wing 
  has 
  below 
  

   only 
  a 
  median 
  broad 
  projection, 
  which 
  extends 
  about 
  to 
  the 
  hind 
  border 
  

   in 
  the 
  hyaline 
  part 
  of 
  the 
  wing 
  . 
  . 
  . 
  . 
  . 
  . 
  sinuatus, 
  Loew. 
  

  

  c(6). 
  Hyaline 
  spot 
  of 
  the 
  marginal 
  cell 
  in 
  the 
  shape 
  of 
  an 
  elongate 
  stripe 
  near 
  the 
  

   costa, 
  which 
  does 
  not 
  extend 
  below 
  beyond 
  the 
  middle 
  of 
  the 
  cell 
  ; 
  the 
  

   fuscous 
  portion 
  is 
  wavy 
  below, 
  with 
  4-5 
  projections, 
  which 
  are 
  all 
  far 
  from 
  i 
  

   the 
  hind 
  border 
  of 
  wing 
  . 
  . 
  . 
  . 
  . 
  . 
  . 
  . 
  undatus, 
  sp. 
  n. 
  

  

  d{a). 
  Base 
  of 
  stigma 
  with 
  a 
  broad 
  hyaline 
  spot; 
  no 
  hyaline 
  dot 
  in 
  the 
  base 
  of 
  the 
  

   first 
  posterior 
  cell; 
  fuscous 
  part 
  of 
  wing 
  ending 
  below 
  with 
  one 
  acute 
  

   median 
  projection, 
  which 
  reaches 
  the 
  hind 
  border 
  of 
  wing 
  along 
  the 
  

   fifth 
  vein.. 
  .. 
  .. 
  .. 
  .. 
  .. 
  .. 
  bigemmatus, 
  sp. 
  n. 
  

  

  2(1). 
  Scutellum 
  broadly 
  black 
  in 
  the 
  middle; 
  discoidal 
  cell 
  with 
  hyaline 
  spots; 
  

   stigma 
  shorter 
  than 
  the 
  second 
  costal 
  cell; 
  antennae 
  much 
  shorter 
  than 
  

   the 
  face, 
  with 
  bare 
  arista 
  ; 
  macrochatae 
  black 
  mundus 
  and 
  excellens. 
  

  

  Ocneros 
  undatus, 
  sp. 
  nov. 
  

  

  A 
  slender 
  and 
  pale-coloured 
  species 
  of 
  smaller 
  size, 
  very 
  distinct 
  on 
  account 
  of 
  

   the 
  lower 
  border 
  of 
  the 
  fuscous 
  part 
  of 
  the 
  wing 
  being 
  wavy 
  and 
  remote 
  from 
  the 
  

   hind 
  border 
  of 
  the 
  wing. 
  

  

  $. 
  Length 
  of 
  body 
  4 
  mm. 
  ; 
  of 
  ovipositor 
  1 
  mm. 
  ; 
  of 
  wing 
  4*5 
  mm. 
  

  

  