﻿494 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM. 
  vol.44. 
  

  

  KEY 
  TO 
  THE 
  SPECIES 
  OF 
  LECTERiA 
  — 
  Continued. 
  

  

  4. 
  Wing-markings 
  present 
  as 
  a 
  narrow 
  Beam 
  along 
  the 
  cord; 
  at 
  fork 
  of 
  Mj+o, 
  R2+3) 
  at 
  

   origin 
  of 
  lis, 
  at 
  origin 
  of 
  the 
  basal 
  deflection 
  of 
  R4+5, 
  and 
  at 
  the 
  tips 
  of 
  Ri 
  and 
  

   R2; 
  cell 
  first 
  Mj 
  pentagonal; 
  basal 
  deflection 
  of 
  Cuj 
  before 
  fork 
  of 
  M; 
  basal 
  

  

  deflection 
  of 
  R4+5long, 
  longer 
  than 
  M, 
  mallo-grossx, 
  new 
  species 
  (Brazil). 
  

  

  Wing 
  markings 
  more 
  extensive; 
  a 
  transverse 
  band 
  across 
  the 
  wing 
  in 
  the 
  neighbor- 
  

   hood 
  of 
  the 
  cord; 
  an 
  interrupted 
  band 
  beginning 
  at 
  origin 
  of 
  Rs; 
  tip 
  of 
  wing 
  

   dark; 
  basal 
  deflection 
  of 
  Cui 
  beyond 
  fork 
  of 
  !M; 
  basal 
  deflection 
  of 
  R4+5 
  short; 
  

   arcuated, 
  less 
  than 
  M, 
  armillans 
  Fabricius 
  ' 
  (Costa 
  Rica-Brazil). 
  

  

  LECTERIA 
  OBLITERATA, 
  new 
  species. 
  

  

  Small, 
  slender; 
  basal 
  anlennal 
  segments 
  yellow; 
  flagellum 
  black; 
  

   general 
  color 
  of 
  the 
  body 
  dull 
  black; 
  legs 
  brown; 
  wings 
  dark-col- 
  

   ored, 
  gra,}'-, 
  

  

  Male. 
  — 
  Length, 
  14.4 
  mm; 
  wing, 
  11 
  mm. 
  Head: 
  Ilostrum 
  and 
  

   palpi 
  dark 
  broAvn; 
  antennae, 
  basal 
  segments 
  elongate-cylindrical, 
  

   stout, 
  second 
  rounded; 
  flagellum, 
  segments 
  rapidly 
  becoming 
  smaller 
  

   toward 
  the 
  tip; 
  basal 
  segments 
  light 
  yellow; 
  flagellar 
  segments 
  

   abruptly 
  dark, 
  black. 
  Front 
  dark 
  brown, 
  shiny; 
  vertex 
  black, 
  

   pollinose 
  on 
  the 
  sides; 
  one 
  or 
  two 
  hairs 
  on 
  the 
  sides 
  of 
  the 
  vertex 
  

   behind 
  the 
  eyes, 
  occiput 
  with 
  a 
  brown 
  bloom; 
  gense 
  more 
  yellowish. 
  

  

  Thorax: 
  pronotum, 
  scutum 
  and 
  scutellum 
  visible 
  from 
  above, 
  

   dull 
  brownish-black. 
  Mesonotum, 
  prsescutum 
  with 
  the 
  pscudo- 
  

   sutural 
  fovea 
  shallow, 
  but 
  prominent, 
  shiny 
  black; 
  prsescutum, 
  

   extreme 
  cephalic 
  margin 
  with 
  a 
  yellowish 
  bloom 
  which 
  is 
  continued 
  

   backward 
  on 
  the 
  sides 
  of 
  the 
  sclerite; 
  dorsum 
  of 
  the 
  sclerite 
  velvety- 
  

   black 
  at 
  the 
  anterior 
  prominence; 
  dull 
  black 
  back 
  to 
  the 
  suture; 
  

   scutum, 
  scutellum, 
  and 
  post-notum 
  black, 
  rather 
  dusted 
  with 
  light 
  

   gray. 
  Pleurae 
  light 
  gray; 
  prothoracic 
  pleurae 
  somewhat 
  darker, 
  

   blackish; 
  an 
  indistinct 
  brown 
  strips, 
  across 
  the 
  pleurae 
  from 
  the 
  

   fore-coxa 
  to 
  the 
  base 
  of 
  the 
  halteres. 
  Ilalteres 
  short, 
  stem 
  pale, 
  

   knob 
  brown. 
  Legs: 
  coxae 
  and 
  trochanters 
  light 
  brownish-yellow; 
  

   femora 
  dark 
  brown, 
  more 
  yellow 
  basally; 
  tibiae 
  and 
  tarsi 
  dark 
  

   brown. 
  Wings 
  dull 
  brownish-gray; 
  cells 
  C 
  and 
  Sc 
  yellow; 
  veins 
  

   Sc 
  and 
  R 
  yellow; 
  remaining 
  veins 
  dark 
  brown. 
  Venation 
  (see 
  fig. 
  41) 
  . 
  

  

  Abdomen 
  very 
  elongate; 
  tergum 
  brownish; 
  segments 
  dull 
  yel- 
  

   low 
  at 
  the 
  base 
  and 
  tip, 
  remainder 
  dark 
  grayish-brown; 
  basal 
  ster- 
  

   nites 
  yellow, 
  apical 
  ones 
  concolorous 
  with 
  the 
  torgites. 
  

  

  Hahitat. 
  — 
  Holotype. 
  — 
  Male, 
  Tukcit, 
  British 
  Guiana, 
  July 
  21, 
  1911 
  

   (Lutz, 
  coll.). 
  Paratype. 
  — 
  Male, 
  Kaieteur 
  Falls, 
  British 
  Guiana, 
  

   Aug. 
  10, 
  1911 
  (Lutz, 
  coll.). 
  

  

  Types. 
  — 
  In 
  American 
  Museum 
  of 
  Natural 
  History. 
  

  

  » 
  Syst. 
  Antl., 
  1805, 
  p. 
  26 
  (as 
  Tipula); 
  Wiedemann, 
  Auss. 
  Zweifl. 
  Ins., 
  1828, 
  vol. 
  1, 
  p. 
  13 
  (as 
  Limnobia). 
  

  

  