﻿NO. 
  1966. 
  SYNOPSIS 
  OF 
  NEOTROPICAL 
  LIMNOBINM— 
  ALEXANDER. 
  527 
  

  

  Antennae: 
  first 
  segment 
  broadly 
  oval-cylindrical; 
  second 
  short, 
  

   oval-cylindrical, 
  much 
  narrower 
  than 
  the 
  first; 
  third 
  segment 
  

   elongate-cylindrical, 
  not 
  constricted, 
  with 
  long 
  delicate 
  hairs; 
  seg- 
  

   ments 
  4 
  to 
  the 
  end, 
  constricted 
  at 
  the 
  ends, 
  and 
  constricted 
  once 
  or 
  

   twice 
  medially, 
  producing 
  a 
  bi-nodose 
  or 
  tri-nodose 
  appearance. 
  As 
  

   previously 
  stated, 
  some 
  (as 
  niveitarsis) 
  have 
  simple 
  flagellar 
  segments; 
  

   at 
  the 
  nodes, 
  the 
  segments 
  are 
  clothed 
  with 
  long 
  outstretched 
  hairs 
  

   which 
  are 
  much 
  longer 
  than 
  the 
  segments 
  which 
  bear 
  them; 
  inter- 
  

   spersed 
  with 
  these 
  are 
  very 
  short, 
  prominent 
  bristles, 
  and 
  over 
  the 
  

   whole 
  segment 
  is 
  a 
  fine 
  delicate 
  pubescence. 
  

  

  Palpi: 
  first 
  segment 
  very 
  short, 
  second 
  and 
  third 
  subequal 
  in 
  

   diameter 
  and 
  length; 
  fourth 
  about 
  as 
  long 
  as 
  2 
  and 
  3 
  together, 
  

   narrower 
  than 
  either. 
  

  

  Venation: 
  Sc, 
  at, 
  or 
  near, 
  the 
  tip 
  of 
  Sc^; 
  R 
  long, 
  R^ 
  usually 
  far 
  

   back 
  from 
  its 
  tip; 
  M^ 
  and 
  M3 
  usually 
  separate 
  at 
  the 
  wing 
  -margin; 
  

   ^Mj 
  and 
  Cui 
  fused 
  for 
  a 
  considerable 
  distance, 
  when 
  separating, 
  the 
  

   fork 
  symmetrical; 
  cross 
  vein 
  m 
  absent. 
  

  

  Genitalia: 
  male 
  (ohscura); 
  pleurae 
  very 
  long, 
  cylindrical, 
  thickly 
  

   clothed 
  on 
  the 
  external 
  facies 
  with 
  long 
  hairs; 
  two 
  apical 
  appendages; 
  

   anal 
  tube 
  broad, 
  distinct; 
  guard 
  of 
  the 
  penis 
  scarcely 
  visible 
  from 
  the 
  

   exterior. 
  

  

  KEY 
  TO 
  THE 
  SPECIES 
  OP 
  POLYMERA. 
  

  

  1. 
  Cell 
  Ml 
  entirely 
  absent 
  2. 
  

  

  Cell 
  M] 
  present 
  3. 
  

  

  2. 
  Large 
  species 
  (wing 
  6.2-6.8 
  mm.); 
  Cuj-I-Ma 
  shorter 
  than 
  M3 
  alone; 
  pleurae 
  dark 
  j 
  

  

  tarsi 
  white 
  pleuralis, 
  new 
  species 
  (Brazil) 
  . 
  

  

  Small 
  species 
  (wing 
  3-3.5 
  mm.); 
  Cuj+Mg 
  longer 
  than 
  M3 
  alone; 
  pleurae 
  not 
  dark; 
  

   tarsi 
  not 
  white 
  conjuncta, 
  new 
  species 
  (Brazil) 
  . 
  

  

  3. 
  Wings 
  not 
  uniform 
  in 
  coloration 
  4. 
  

  

  Wings 
  uniform 
  in 
  coloration 
  6. 
  

  

  4 
  . 
  Wings 
  dark 
  colored 
  with 
  lighter 
  spots 
  or 
  fasciae 
  5. 
  

  

  Wings 
  hyaline, 
  or 
  nearly 
  so, 
  with 
  small 
  brown 
  spots 
  at 
  the 
  forks 
  of 
  most 
  of 
  the 
  

  

  veins 
  ohscura 
  Macquart 
  (Brazil). 
  

  

  5. 
  Wings 
  with 
  white 
  or 
  whitish 
  spots 
  superba, 
  new 
  species 
  (Costa 
  Rica, 
  Brazil). 
  

  

  Wings 
  with 
  a 
  light.yellow 
  cross-band 
  hirticomis 
  Fabricius 
  (Brazil). 
  

  

  6. 
  Flagellar 
  segments 
  of 
  the 
  antennae 
  elongate-cylindrical, 
  not 
  noticeably 
  con- 
  

  

  stricted 
  7. 
  

  

  Flagellar 
  segments 
  of 
  the 
  antennae 
  constricted 
  once 
  or 
  twice, 
  giving 
  a 
  multi-seg- 
  

   mented 
  appearance 
  to 
  the 
  antennae 
  8. 
  

  

  7. 
  Tarsi 
  of 
  all 
  the 
  legs 
  white 
  fusca 
  Wiedemann 
  * 
  (Brazil). 
  

  

  Only 
  tarsi 
  of 
  hind 
  legs 
  white 
  niveitarsis, 
  new 
  species 
  (Guat., 
  Brazil). 
  

  

  8. 
  Fore 
  and 
  middle 
  tarsi 
  more 
  or 
  less 
  yellowish-white 
  or 
  white 
  9. 
  

  

  Fore 
  and 
  middle 
  tarsi 
  dark, 
  about 
  concolorous 
  with 
  the 
  tibiae 
  11. 
  

  

  9. 
  Antennae 
  conspicuously 
  annulated, 
  rather 
  short 
  (about 
  as 
  long 
  as 
  the 
  body). 
  

  

  georgiae 
  Alexander 
  ^ 
  (Southeast 
  U. 
  S.). 
  

   Antennae 
  not 
  conspicuously 
  annulated, 
  much 
  longer 
  than 
  the 
  body 
  10. 
  

  

  1 
  Auss. 
  Zweifl. 
  Ins., 
  vol. 
  1, 
  pp. 
  58 
  and 
  554, 
  pi. 
  6b, 
  figs. 
  3-4. 
  Original 
  description 
  in 
  Dipt. 
  Exot., 
  

   vol. 
  1, 
  p. 
  44. 
  

  

  2 
  Psyche 
  (Dec, 
  1911), 
  pp. 
  199, 
  200, 
  fig. 
  5. 
  

  

  