﻿504 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM. 
  

  

  KEY 
  TO 
  THE 
  SPECIES 
  OP 
  LEIPONEURA 
  SKUSE 
  — 
  Continued. 
  

  

  3. 
  Pleural 
  stripes 
  dark 
  chestnut-brown 
  and 
  yellow, 
  distinct; 
  stigma 
  clear 
  cut, 
  dark- 
  

  

  brown 
  pleuralis 
  Williston 
  (Cuba 
  — 
  St. 
  Vincent 
  Is.). 
  

  

  Pleural 
  stripes 
  indistinct, 
  or 
  faintly 
  indicated; 
  stigma 
  faint 
  or 
  lacking 
  4. 
  

  

  4. 
  A 
  faint 
  })lue 
  tinge 
  on 
  pleur«; 
  no 
  stripes; 
  mesonotum 
  light 
  browai, 
  

  

  puella 
  Williston 
  (Lesser 
  Antilles; 
  Mexico). 
  

   Pleural 
  plumbeous 
  with 
  a 
  yellow 
  stripe; 
  mesonotum 
  brownish-gray, 
  

  

  puer, 
  new 
  species 
  (Greater 
  Antilles). 
  

  

  KEY 
  TO 
  THE 
  SPECIES 
  OP 
  GONOMYIA 
  MBIGEN. 
  

  

  (Neotropical 
  and 
  Nearctic, 
  excluding 
  boreal 
  forms.) 
  

  

  1. 
  Wings 
  spotted 
  blanda 
  Osten 
  Sacken 
  ^ 
  (E. 
  and 
  SE. 
  United 
  States). 
  

  

  Wings 
  unmarked 
  (except 
  stigmal 
  spot 
  in 
  cases) 
  2. 
  

  

  2. 
  Femora 
  with 
  a 
  distinct 
  brown 
  anteapical 
  band, 
  

  

  sulphurella 
  Osten 
  Sacken 
  ^ 
  (E. 
  United 
  States). 
  

   Femora 
  unicolorous, 
  unhanded 
  3. 
  

  

  3. 
  Antennae 
  orange 
  or 
  yellow 
  at 
  the 
  basis 
  4. 
  

  

  Antennse 
  entirely 
  brown 
  or 
  black 
  5. 
  

  

  4. 
  Pleural 
  stripes 
  dark 
  brown; 
  Sc 
  very 
  short 
  delicata, 
  new 
  species 
  (Guatemala). 
  

  

  Pleural 
  stripes 
  reddish; 
  Sc 
  longer, 
  ending 
  slightly 
  before 
  the 
  origin 
  of 
  Rs., 
  

  

  cognatella 
  Osten 
  Sacken^ 
  (E. 
  United 
  States). 
  

  

  5. 
  Pleurae 
  with 
  a 
  brown 
  stripe 
  running 
  from 
  collare 
  to 
  base 
  of 
  halteres, 
  

  

  virgata 
  Doane^ 
  (W. 
  United 
  States). 
  

   Pleuras 
  without 
  distinct 
  stripes 
  6. 
  

  

  6. 
  Pleuras 
  uniformly 
  light 
  yellow; 
  basal 
  deflection 
  of 
  Cui 
  at 
  the 
  inner 
  end 
  of 
  the 
  short 
  

  

  cell 
  first 
  Mj 
  subcinerea 
  Osten 
  Sacken 
  * 
  (E. 
  United 
  States). 
  

  

  Pleurae 
  rich 
  light 
  brown; 
  basal 
  deflection 
  of 
  Cui, 
  under 
  the 
  middle 
  of 
  the 
  long 
  cell 
  

   first 
  M2 
  unicolor, 
  new 
  species 
  (Mexico 
  and 
  C. 
  America). 
  

  

  GONOMYIA 
  (LEIPONEURA) 
  PLEURALIS 
  Williston. 
  

  

  Atarha 
  pleuralis 
  Williston, 
  Trans. 
  Ent. 
  Soc. 
  Lond., 
  1896, 
  p. 
  289, 
  pi. 
  10, 
  fig. 
  61, 
  

   male 
  and 
  female. 
  — 
  Coquillett, 
  Proc. 
  U. 
  S. 
  Nat. 
  Mus., 
  1900, 
  p. 
  250. 
  — 
  Ker- 
  

   TESz, 
  Cat. 
  Dipterorum, 
  vol. 
  2, 
  1902, 
  p^ 
  189. 
  — 
  Aldrich, 
  Cat. 
  N. 
  Amer. 
  Dipt., 
  

   1905, 
  p. 
  82.— 
  Williston, 
  Man. 
  N. 
  Amer. 
  Dipt., 
  1908, 
  p. 
  85 
  (fig. 
  32). 
  

  

  Atabarba 
  pleuralis 
  Hunter, 
  Trans. 
  Amer. 
  Ent. 
  Soc, 
  1900, 
  p. 
  290. 
  

  

  Gonomyia 
  pleuralis 
  Alexander, 
  Ent. 
  News, 
  vol. 
  23, 
  1912, 
  p. 
  419. 
  

  

  Male. 
  — 
  Length, 
  5.1 
  mm; 
  wing, 
  3.4 
  mm. 
  

  

  Female. 
  — 
  ^Length, 
  6.4 
  mm; 
  wing, 
  5 
  mm. 
  

  

  Head: 
  rostrum 
  and 
  palpi 
  dark 
  brown; 
  antennae, 
  basal 
  two 
  or 
  three 
  

   segments 
  light 
  yellow, 
  remamder 
  brown; 
  front, 
  vertex 
  and 
  occiput 
  

   light 
  yellow; 
  a 
  black 
  spot 
  on 
  the 
  vertex 
  between 
  the 
  eyes. 
  

  

  Thorax: 
  mesothoracic 
  prsescutum 
  rich 
  chestnut-brown, 
  lateral 
  and 
  

   cephalic 
  margm 
  broadly 
  light 
  yellow, 
  this 
  bordered 
  internally 
  by 
  a 
  

   narrow 
  line 
  of 
  darker 
  brown; 
  pseudosuture 
  light 
  brown, 
  short, 
  tri- 
  

   angular; 
  scutum 
  like 
  the 
  praescutum; 
  scutellum 
  yellow 
  with 
  a 
  narrow 
  

  

  1 
  Monographs, 
  vol. 
  4, 
  pp. 
  182, 
  183, 
  male 
  and 
  female. 
  

  

  2 
  Idem, 
  pp. 
  180, 
  181, 
  male 
  and 
  female. 
  

   ' 
  Idem., 
  p. 
  181, 
  male 
  and 
  female. 
  

  

  4 
  Joum. 
  N. 
  Y. 
  Ent. 
  Soc., 
  1900, 
  p. 
  189, 
  pi. 
  7, 
  fig. 
  21. 
  

   6 
  Monographs, 
  voL 
  4, 
  pp. 
  181, 
  182, 
  male 
  and 
  female. 
  

  

  