﻿138 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM 
  ^°^- 
  ^°» 
  

  

  Following 
  Goetghebuer 
  (1934), 
  I 
  regard 
  Schizohelea 
  as 
  a 
  subgenus 
  

   for 
  leucopeza 
  Meigen. 
  

  

  Diagnosis. 
  — 
  This 
  species 
  differs 
  rather 
  markedly 
  from 
  the 
  other 
  

   species 
  of 
  Monohelea 
  in 
  having 
  the 
  second 
  branch 
  of 
  the 
  media 
  broadly 
  

   interrupted 
  at 
  the 
  base, 
  basitarsus 
  without 
  apical 
  spine, 
  and 
  male 
  

   genitalia 
  with 
  emarginate 
  sternite 
  and 
  arched 
  aedeagus. 
  

  

  1. 
  Monohelea 
  (Schizohelea) 
  leucopeza 
  (Meigen), 
  1804 
  

  

  Figure 
  18, 
  m 
  

  

  Ceratopogon 
  leucopeza 
  Meigen, 
  Klassifikation 
  und 
  Beschreibung 
  . 
  . 
  . 
  Insekten, 
  

  

  vol. 
  1, 
  p. 
  29, 
  1804. 
  

   Ceratolophus 
  leucopeza, 
  Kieffer, 
  Genera 
  insectorum, 
  fasc. 
  42, 
  p. 
  60, 
  1906. 
  

   Schizohelea 
  leucopeza, 
  Edwards, 
  Trans. 
  Ent. 
  Soc. 
  London, 
  vol. 
  74, 
  p. 
  411, 
  1926. 
  — 
  

  

  Seguy, 
  Faune 
  de 
  France, 
  pt. 
  8, 
  p. 
  70, 
  1937. 
  

   Monohelea 
  (Schizohelea) 
  leucopeza, 
  Goetghebuer, 
  in 
  Lindner, 
  Die 
  Fliegen 
  der 
  

  

  Palaearktischen 
  Region, 
  Lief. 
  78, 
  p. 
  53, 
  1934. 
  

   Ceratopogon 
  albiiarsis 
  Wiedemann, 
  Zool. 
  Mag., 
  vol. 
  1, 
  p. 
  67, 
  1817. 
  

   Ceratopogon 
  copiosus 
  Winnertz, 
  Linn. 
  Ert., 
  vol. 
  6, 
  p. 
  56, 
  1852. 
  

   Ceratolophus 
  copiosus, 
  Kieflfer, 
  Genera 
  insectorum, 
  fasc. 
  42, 
  p. 
  60, 
  1906. 
  

   Schizohelea 
  copiosa, 
  Kieflfer, 
  Ann. 
  Mus. 
  Nat. 
  Hungarici, 
  vol. 
  15, 
  p. 
  295, 
  1917; 
  idem, 
  

  

  vol. 
  16, 
  p. 
  57, 
  1918; 
  idem, 
  vol. 
  17, 
  p. 
  89, 
  1919.— 
  Goetghebuer, 
  Mem. 
  Mus. 
  

  

  Hist. 
  Nat. 
  Belgique, 
  vol. 
  8, 
  p. 
  66, 
  1920. 
  — 
  Kieffer, 
  Faune 
  de 
  France, 
  pt. 
  11, 
  

  

  p. 
  116, 
  1925. 
  

   Ceratopogon 
  politus 
  Coquillett, 
  Proc. 
  U. 
  S. 
  Nat. 
  Mus., 
  vol. 
  23, 
  p. 
  606, 
  1901 
  ( 
  9 
  , 
  

  

  Massachusetts) 
  . 
  

   Ceratolophus 
  politus, 
  Kieflfer, 
  Genera 
  insectorum, 
  fasc. 
  42, 
  p. 
  61, 
  1906. 
  

   Johannseniella 
  polita, 
  Malloch, 
  Bull. 
  Illinois 
  State 
  Lab. 
  Nat. 
  Hist., 
  vol. 
  10, 
  p. 
  

  

  227, 
  1914. 
  

   Johannsenomyia 
  polita, 
  Malloch, 
  Bull. 
  Illinois 
  State 
  Lab. 
  Nat. 
  Hist., 
  vol. 
  10, 
  p. 
  

  

  335, 
  1915 
  (New 
  York). 
  

   Sphaeromias 
  polita, 
  Kieflfer, 
  Ann. 
  Mus. 
  Nat. 
  Hungarici, 
  vol. 
  15, 
  p. 
  364, 
  1917. 
  

   Allohelea 
  polita, 
  Kieflfer, 
  Ann. 
  Mus. 
  Nat. 
  Hungarici, 
  vol. 
  15, 
  p. 
  364, 
  1917. 
  

   Schizohelea 
  polita, 
  Johannsen, 
  Ann. 
  Ent. 
  Soc. 
  Amer.. 
  vol. 
  36, 
  p. 
  782, 
  1943 
  

  

  (? 
  ^leucopeza 
  Meigen). 
  

   Bezzia 
  stecki 
  Kieflfer, 
  Broteria, 
  Ser, 
  Zool., 
  vol. 
  13, 
  p. 
  65, 
  1915. 
  

  

  Description. 
  — 
  Female: 
  Length 
  1.5 
  mm., 
  wing 
  1.2 
  mm. 
  by 
  0.5 
  mm. 
  

   Entirely 
  shining 
  black, 
  only 
  the 
  tarsi, 
  wings, 
  and 
  halteres 
  white. 
  

   Antennae 
  quite 
  short, 
  the 
  distal 
  segments 
  scarcely 
  elongated. 
  

   Mesonotum 
  with 
  scattered, 
  erect, 
  long, 
  black 
  hairs; 
  scutellum 
  with 
  

   six 
  long 
  marginal 
  hairs. 
  Second 
  radial 
  cell 
  half 
  again 
  as 
  long 
  as 
  the 
  

   first, 
  M2 
  broadly 
  interrupted 
  at 
  base. 
  Spermathecae 
  two, 
  subequal, 
  

   rather 
  small 
  and 
  subspherical, 
  the 
  ducts 
  sclerotized 
  a 
  short 
  distance. 
  

  

  Male 
  (based 
  on 
  specimen 
  from 
  Suffolk, 
  England): 
  Ninth 
  sternite 
  

   about 
  three 
  times 
  as 
  broad 
  as 
  long, 
  with 
  a 
  shallow, 
  round 
  emargination 
  

   in 
  middle 
  of 
  caudal 
  margin, 
  not 
  spiculate; 
  ninth 
  tergite 
  narrow, 
  sur- 
  

   passing 
  basistyles, 
  distal 
  half 
  with 
  margins 
  subparallel, 
  apex 
  truncate 
  

   with 
  setose 
  apicolateral 
  corners, 
  the 
  inner 
  surface 
  coarsely 
  spiculate. 
  

   Basistyles 
  broad 
  at 
  base, 
  each 
  with 
  a 
  distinct 
  lobe 
  bearing 
  three 
  setose 
  

   tubercles 
  on 
  inner 
  side; 
  abruptly 
  narrowed 
  on 
  distal 
  half; 
  dististyles 
  

  

  