﻿528 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM. 
  vol.44. 
  

  

  KEY 
  TO 
  THE 
  SPECIES 
  OF 
  POLYMERA 
  — 
  Continued. 
  

  

  10. 
  Thorax 
  light-colored; 
  brownish-yellow 
  with 
  a 
  narrow 
  dark 
  pleural 
  stripe; 
  wings 
  

  

  brown 
  albitarsis 
  Williston 
  ' 
  (Lesser 
  Antilles). 
  

  

  Thorax 
  uniform 
  in 
  color, 
  dark 
  bi'own; 
  wings 
  gray.. 
  /.^omei'ca, 
  new 
  species 
  (Brazil). 
  

  

  11. 
  Large 
  species; 
  length 
  (male) 
  4.5 
  mm.; 
  wing 
  4.7 
  mm.; 
  distance 
  of 
  R, 
  beyond 
  r 
  

   equal 
  to 
  that 
  space 
  between 
  Scj 
  and 
  r; 
  wings 
  yellowish. 
  

  

  inornata, 
  new 
  species 
  (Brit. 
  Guiana). 
  

   Small 
  species; 
  length 
  (male) 
  3 
  mm.; 
  wing 
  4.6 
  mm.; 
  distance 
  of 
  R, 
  beyond 
  r 
  

   much 
  less 
  than 
  that 
  space 
  between 
  Scg 
  and 
  r; 
  wings 
  gray. 
  

  

  grisea, 
  new 
  species 
  (Panama). 
  

   (Probably 
  here; 
  see 
  description.) 
  

  

  POLYMERA 
  PLEURALIS, 
  new 
  species. 
  

  

  Size 
  medium; 
  flagellar 
  segments 
  of 
  the 
  antennas 
  tri-nodose; 
  wing 
  

   with 
  cell 
  Ml 
  absent; 
  Mg+Cui 
  much 
  shorter 
  than 
  Mg 
  alone; 
  tarsi 
  

   white 
  or 
  whitish; 
  thoracic 
  pleurae 
  mth 
  a 
  broad 
  black 
  stripe. 
  

  

  Length, 
  male, 
  5 
  mm.; 
  female 
  (to 
  tip 
  of 
  ovipositor), 
  6.6-6.8 
  mm.; 
  

   wing, 
  male, 
  6.4 
  mm.; 
  female, 
  6.2-6.8 
  mm.; 
  antennae, 
  male 
  (about), 
  

   8.5 
  mm.; 
  hind 
  leg, 
  female, 
  femur, 
  5.4 
  mm.; 
  tibia 
  +tarsus, 
  8.6 
  mm. 
  

  

  Male. 
  — 
  Palpi 
  and 
  rostrum 
  light 
  brown, 
  the 
  latter 
  more 
  yellowish; 
  

   eyes 
  large, 
  conspicuous, 
  leaving 
  the 
  vertex 
  narrow 
  between 
  the 
  eyes; 
  

   vertex 
  grayish; 
  occiput 
  brownish-gray. 
  Antennae, 
  basal 
  segment 
  

   dark 
  brown, 
  second 
  lighter 
  brown, 
  third 
  elongate-cylindrical 
  fifth 
  

   to 
  near 
  the 
  end 
  (most 
  noticeable 
  in 
  the 
  region 
  of 
  the 
  tenth 
  segment) 
  

   constricted 
  twice, 
  producing 
  a 
  tri-nodose 
  effect, 
  segments 
  brown, 
  the 
  

   extreme 
  base 
  and 
  tip 
  paler, 
  yellowish, 
  givmg 
  an 
  annulated 
  appear- 
  

   ance 
  to 
  the 
  antennae. 
  

  

  Thorax: 
  dorsum 
  uniform 
  light 
  brown; 
  pleurae 
  very 
  broadly 
  dark 
  

   brownish-black, 
  extending 
  from 
  the 
  cervical 
  sclerites 
  to 
  the 
  abdomen, 
  

   this 
  color 
  encroaching 
  on 
  the 
  fore 
  coxa; 
  sterna 
  pale 
  whitish-yellow. 
  

   Halteres 
  light 
  brown, 
  the 
  knob 
  rather 
  dark. 
  Legs: 
  coxae, 
  trochan- 
  

   ters 
  and 
  extreme 
  base 
  of 
  the 
  femora 
  pale 
  whitish-yellow, 
  remainder 
  

   of 
  the 
  femora 
  and 
  the 
  tibiae 
  pale 
  brown, 
  darker 
  at 
  the 
  extreme 
  tip; 
  

   tarsi 
  yellowish- 
  white, 
  except 
  the 
  last 
  segment, 
  which 
  is 
  bro\vn. 
  

  

  Wings: 
  uniformly 
  tinged 
  with 
  light 
  brown. 
  Veijation: 
  Sc 
  rather 
  

   long, 
  ending 
  about 
  opposite 
  the 
  fork 
  of 
  Ro+s; 
  Rs 
  not 
  gently 
  arcuated 
  

   at 
  its 
  basis, 
  but 
  rather 
  square; 
  Rj 
  beyond 
  the 
  cross-vein 
  r 
  about 
  two- 
  

   fifths 
  the 
  distance 
  from 
  Scg 
  to 
  r; 
  R2+3 
  short, 
  shorter 
  than 
  the 
  basal 
  

   deflection 
  of 
  Cuj; 
  basal 
  deflection 
  of 
  R4+5 
  longer 
  than 
  r-m. 
  M^+j 
  

   fused 
  to 
  the 
  wing-margin. 
  Mg-I-Cui 
  short, 
  only 
  about 
  two-fifths 
  as 
  

   long 
  as 
  Cui 
  beyond 
  the 
  fork. 
  (See 
  figo 
  17.) 
  

  

  Abdomen 
  blackish, 
  sternum 
  little, 
  if 
  any, 
  paler. 
  

  

  Female. 
  — 
  Quite 
  similar 
  to 
  the 
  male, 
  but 
  antennae 
  short, 
  normal 
  in 
  

   appearance, 
  not 
  annulated; 
  if 
  bent 
  backward, 
  would 
  extend 
  about 
  

   to 
  the 
  base 
  of 
  the 
  abdomen. 
  In 
  color 
  and 
  venation, 
  as 
  in 
  the 
  male. 
  

  

  > 
  Trans. 
  Ent. 
  Soc. 
  Lond., 
  1896, 
  p. 
  296, 
  pi. 
  10, 
  fig. 
  71. 
  

  

  