﻿524 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM. 
  vol.44. 
  

  

  lighter 
  yellow, 
  segments 
  with 
  numerous 
  long 
  black 
  hairs. 
  Front, 
  

   vertex 
  and 
  occiput 
  dull 
  yellow 
  with 
  a 
  brown 
  tinge; 
  genae 
  clearer 
  

   brown. 
  

  

  Thorax: 
  pronotum 
  light 
  yellow. 
  Mesonotum: 
  prsescutum 
  covered 
  

   with 
  a 
  thick 
  pubescence, 
  light 
  yellow 
  with 
  two 
  brown 
  stripes 
  on 
  either 
  

   side 
  of 
  the 
  median 
  line, 
  these 
  stripes 
  pale, 
  yellowish-brown 
  in 
  front 
  ; 
  

   a 
  large 
  rounded 
  brown 
  spot 
  on 
  the 
  sides 
  of 
  the 
  sclerite 
  before 
  the 
  

   pseudosuture 
  ; 
  scutum, 
  scutellum 
  and 
  post-no 
  tum 
  brown, 
  tlie 
  latter 
  

   darker. 
  Pleurse 
  light 
  yellow 
  with 
  a 
  broad 
  brown 
  band 
  iiinning 
  from 
  

   the 
  side 
  of 
  the 
  pronotum 
  backward 
  under 
  the 
  wing-bases 
  to 
  the 
  post- 
  

   notum; 
  sternum 
  light 
  brown. 
  Halteres 
  broken, 
  stem 
  yellow. 
  Legs 
  

   light 
  yellow, 
  a 
  light 
  brown 
  ring 
  at 
  the 
  tip 
  of 
  the 
  femora, 
  a 
  darker 
  one 
  

   at 
  the 
  tip 
  of 
  the 
  tibiee; 
  tar^, 
  tip 
  of 
  segment 
  2, 
  all 
  of 
  3 
  to 
  5 
  dark 
  brown; 
  

   legs 
  densely 
  hairy. 
  

  

  Wings: 
  hyaline 
  with 
  two 
  brown 
  bands, 
  one 
  traversing 
  the 
  wing- 
  

   basis, 
  extending 
  from 
  near 
  the 
  humeral 
  cross 
  vein 
  to 
  the 
  origin 
  of 
  tlie 
  

   sector, 
  narrower 
  in 
  the 
  anal 
  cells. 
  The 
  second 
  band 
  is 
  in 
  the 
  vicinity 
  

   of 
  the 
  cord, 
  cells 
  second 
  R^ 
  almost 
  all 
  included, 
  base 
  of 
  cell 
  Rg, 
  tip 
  of 
  

   cell 
  R, 
  base 
  of 
  cells 
  Rg 
  and 
  first 
  M^; 
  a 
  prominent 
  brown 
  cloud 
  at 
  the 
  

   basal 
  deflection 
  of 
  Cuj 
  and 
  along 
  the 
  second 
  deflection 
  of 
  Mg 
  and 
  cross 
  

   vein 
  m 
  (outer 
  end 
  of 
  cell 
  first 
  Mj) 
  ; 
  a 
  very 
  pale 
  brown 
  cloud 
  extends 
  

   across 
  the 
  cells 
  Rj, 
  Rg, 
  R5, 
  and 
  Mj. 
  Venation 
  (see 
  fig. 
  30). 
  

  

  Abdomen: 
  tergum 
  light 
  yellow; 
  all 
  except 
  segment 
  5 
  with 
  the 
  

   sclerite 
  largely 
  brown, 
  especially 
  caudally 
  and 
  laterally; 
  segment 
  5 
  

   clear 
  yellow; 
  sternum 
  light 
  yeflow. 
  

  

  Holotype. 
  — 
  Female, 
  Rio 
  de 
  Janiero, 
  Brazil 
  (November) 
  (coll. 
  H. 
  H. 
  

   Smith). 
  

  

  Type. 
  — 
  In 
  American 
  Museum 
  of 
  Natural 
  History. 
  

  

  Genus 
  TRIMICRA 
  Osten 
  Saeken. 
  

  

  Trimicra 
  Osten 
  Sacken, 
  Proc. 
  Acad. 
  Nat. 
  Sci. 
  Phila., 
  1861, 
  p. 
  290; 
  Monographs, 
  

  

  vol. 
  4, 
  1869, 
  p. 
  165; 
  Studies, 
  etc., 
  pt. 
  2, 
  1887, 
  p. 
  195. 
  

   lima 
  RoNDANi, 
  Prodr., 
  vol. 
  1, 
  1856, 
  p. 
  182. 
  

  

  KEY 
  TO 
  THE 
  AMERICAN 
  SPECIES 
  OP 
  TRIMICRA. 
  

  

  1. 
  Antennae 
  uniformly 
  brown; 
  wings 
  not 
  pubescent; 
  large 
  species, 
  length, 
  7 
  mm. 
  or 
  

  

  over 
  anomala 
  Osten 
  Saeken. 
  ^ 
  

  

  Antennae 
  with 
  the 
  basal 
  segments 
  yellow; 
  wings 
  pubescent; 
  small 
  species, 
  length, 
  

   5 
  mm. 
  or 
  less 
  pygmsea 
  Alexander. 
  ^ 
  

  

  In 
  the 
  United 
  States 
  National 
  Museum 
  collection 
  is 
  a 
  series 
  of 
  

   specimens 
  from 
  Mexico 
  which 
  agree 
  very 
  well 
  with 
  the 
  description 
  of 
  

   T. 
  anomala, 
  and 
  I 
  have 
  determined 
  them 
  as 
  such. 
  As 
  to 
  whether 
  or 
  

   not 
  this 
  species 
  is 
  conspecific 
  with 
  the 
  European 
  Trimicra 
  pilipes 
  

   Fabricius, 
  as 
  given 
  by 
  Osten 
  Saeken 
  in 
  his 
  Western 
  Diptera, 
  page 
  200, 
  

  

  1 
  Proc. 
  Acad. 
  Nat. 
  Sci. 
  Phila., 
  1861, 
  p. 
  290; 
  Monographs, 
  vol. 
  4, 
  p. 
  167. 
  

   « 
  Psyche, 
  vol. 
  19, 
  Dec, 
  1912, 
  p. 
  166, 
  pi. 
  13, 
  fig. 
  3. 
  

  

  