﻿2 
  PROF. 
  M. 
  BEZZI. 
  

  

  2(1). 
  Only 
  a 
  single 
  upper 
  and 
  a 
  single 
  lower 
  pair 
  of 
  orbitals 
  ; 
  arista 
  pilose 
  on 
  both 
  

   sides 
  and 
  in 
  the 
  male 
  with 
  a 
  tuft-like 
  pilosity 
  at 
  the 
  end 
  ; 
  mesonotum 
  in 
  

   front 
  of 
  the 
  scutellum 
  with 
  two 
  blackish 
  spots, 
  which 
  are 
  extended 
  over 
  

   the 
  scutellum 
  itself 
  ; 
  middle 
  scutellar 
  bristles 
  as 
  strong 
  as 
  the 
  others 
  ; 
  

   discoidal 
  cell 
  with 
  but 
  one 
  isolated 
  hyaline 
  spot 
  . 
  . 
  termitoxena, 
  sp. 
  n. 
  

  

  Rioxa 
  musae, 
  Froggatt, 
  1899. 
  

   Try 
  f 
  eta 
  musae. 
  Froggatt, 
  Agric. 
  Gaz. 
  N.S.W., 
  Sydney, 
  1899, 
  x, 
  p. 
  501, 
  pi. 
  ii, 
  figs. 
  

   1-3; 
  id., 
  "Austral. 
  Insects," 
  Sydney, 
  1908, 
  p. 
  308; 
  id., 
  Keport 
  on 
  Fruit-fly 
  

   and 
  other 
  Pests 
  in 
  various 
  Countries, 
  1907-8, 
  Dept. 
  Agric. 
  N.S.W., 
  1908, 
  p. 
  113, 
  

   pi. 
  vii, 
  figs. 
  1-3. 
  

   Rioxa 
  (Trypeta) 
  musae, 
  Froggatt, 
  Proc. 
  Linn. 
  Soc. 
  N.S.W., 
  1911, 
  xxxv 
  (1910), 
  p. 
  872. 
  

   Rioxa 
  musae, 
  Bezzi, 
  Mem. 
  Ind. 
  Mus. 
  1913, 
  iii, 
  pp. 
  76 
  and 
  114. 
  

   The 
  present 
  species 
  was 
  originally 
  obtained 
  from 
  bananas 
  brought 
  to 
  Australia 
  

   from 
  the 
  New 
  Hebrides 
  ; 
  but 
  it 
  has 
  been 
  found 
  subsequently 
  breeding 
  in 
  both 
  culti- 
  

   vated 
  and 
  native 
  fruits 
  in 
  Queensland 
  and 
  New 
  South 
  Wales. 
  

  

  2. 
  Rioxa 
  termitoxena 
  sp. 
  nov. 
  (fig. 
  1). 
  

  

  Differing 
  from 
  all 
  the 
  other 
  known 
  species 
  in 
  having 
  only 
  a 
  pair 
  of 
  upper 
  orbital 
  

   bristles, 
  and 
  very 
  distinct 
  on 
  account 
  of 
  the 
  peculiar 
  arista 
  of 
  the 
  male. 
  

  

  $ 
  9. 
  Length 
  of 
  body, 
  6*5-7 
  mm.; 
  of 
  the 
  ovipositor, 
  1*5 
  mm. 
  ; 
  of 
  the 
  wing, 
  

   7-7 
  "5 
  mm. 
  

  

  Head 
  (fig. 
  1, 
  A) 
  entirely 
  reddish-yellow 
  ; 
  occiput 
  quite 
  unspotted 
  and 
  shining, 
  

   chiefly 
  near 
  the 
  borders 
  ; 
  it 
  is 
  paler 
  on 
  the 
  sides 
  beneath, 
  and 
  the 
  lower 
  swellings 
  are 
  

   not 
  developed. 
  Frons 
  opaque, 
  with 
  the 
  middle 
  stripe 
  more 
  dark 
  reddish 
  (sometimes 
  

   brownish 
  on 
  the 
  fore 
  half 
  in 
  the 
  female), 
  with 
  more 
  yellowish 
  sides 
  and 
  with 
  a 
  black 
  

   ocellar 
  spot 
  ; 
  it 
  is 
  clothed 
  with 
  rather 
  dense, 
  short 
  and 
  equal, 
  black 
  hairs 
  ; 
  lunula 
  

   yellowish. 
  Face 
  shallowly 
  but 
  distinctly 
  concave 
  above 
  the 
  rather 
  prominent 
  

   mouth-border 
  ; 
  the 
  broad 
  keel 
  between 
  the 
  antennal 
  grooves 
  is 
  flat 
  ; 
  cheeks 
  very 
  

   narrow, 
  linear, 
  whitish; 
  jowls 
  broader 
  than 
  the 
  third 
  antennal 
  joint, 
  unspotted. 
  

  

  A 
  B 
  

  

  Fig. 
  1. 
  Rioxa 
  termitoxena, 
  sp. 
  n. 
  

   a, 
  head 
  of 
  male 
  ; 
  b, 
  wing 
  of 
  fully 
  coloured 
  female. 
  

  

  Eyes 
  rather 
  broad, 
  but 
  with 
  the 
  vertical 
  diameter 
  longer 
  than 
  the 
  horizontal 
  one. 
  

   Antennae 
  inserted 
  near 
  the 
  middle 
  of 
  the 
  eyes, 
  shorter 
  than 
  the 
  face, 
  and 
  entirely 
  

   reddish 
  ; 
  first 
  joint 
  very 
  short, 
  with 
  black 
  hairs 
  at 
  the 
  sides 
  ; 
  second 
  joint 
  short 
  and 
  

   globular, 
  with 
  short 
  black 
  hairs 
  ; 
  third 
  joint 
  about 
  twice 
  as 
  long 
  as 
  the 
  first 
  two 
  

   joints 
  together, 
  almost 
  bare, 
  rounded 
  at 
  the 
  end, 
  only 
  slightly 
  concave 
  above 
  ; 
  

   arista 
  with 
  rather 
  long 
  and 
  scattered 
  hairs 
  from 
  the 
  base 
  to 
  the 
  end 
  on 
  the 
  upper 
  

   side, 
  and 
  on 
  the 
  apical 
  half 
  alone 
  beneath; 
  in 
  the 
  male 
  the 
  terminal 
  hairs 
  of 
  the 
  

  

  