﻿NO. 
  1966. 
  SYNOPSIS 
  OF 
  NEOTROPICAL 
  LIMNOBIN^— 
  ALEXANDER. 
  525 
  

  

  I 
  will 
  not 
  attempt 
  to 
  decide 
  without 
  having 
  European 
  material 
  for 
  

   comparison. 
  The 
  data 
  for 
  the 
  Mexican 
  specimens 
  are 
  as 
  follows: 
  

   Cordoba, 
  Mexico, 
  December 
  18, 
  1907, 
  male 
  and 
  female; 
  February 
  

  

  11, 
  1908, 
  male 
  and 
  female; 
  February 
  16, 
  1908, 
  two 
  females; 
  March 
  

  

  12, 
  1908, 
  three 
  females; 
  March 
  16, 
  1908, 
  male. 
  Orizaba, 
  Mexico, 
  

   :March 
  13, 
  1908, 
  male 
  and 
  female 
  (Fred. 
  Knab, 
  coll.). 
  

  

  KEY 
  TO 
  THE 
  GENERA 
  OF 
  THE 
  LIMNOPHILINI. 
  

  

  (Based 
  largely 
  on 
  Needham's 
  key, 
  1907.) 
  

  

  1. 
  Ocelli 
  present 
  2. 
  

  

  Ocelli 
  absent 
  3. 
  

  

  2. 
  Cell 
  Ml 
  present; 
  basal 
  deflection 
  of 
  Cuj 
  near 
  the 
  outer 
  margin 
  of 
  cell 
  first 
  Mj 
  

  

  (i. 
  e., 
  fusion 
  of 
  Cuj 
  and 
  M, 
  very 
  slight) 
  Trichocera 
  Meigen. 
  

  

  Cell 
  Ml 
  absent; 
  basal 
  deflection 
  of 
  Cui 
  at, 
  or 
  near, 
  the 
  fork 
  of 
  M 
  (i. 
  e., 
  fusion 
  of 
  

   Cui 
  and 
  M 
  extensive) 
  Ischnothrix 
  Bigot. 
  

  

  3. 
  Radial 
  cross 
  vein 
  absent 
  Phyllolabis 
  Osten 
  Sacken. 
  

  

  Radial 
  cross 
  vein 
  present 
  4. 
  

  

  4. 
  Cross 
  vein 
  m 
  absent; 
  fusion 
  of 
  Mg 
  and 
  Cui 
  long 
  and 
  ending 
  in 
  a 
  symmetrical 
  

  

  fork 
  Polymera 
  Wiedemann. 
  

  

  Cross 
  vein 
  m 
  present; 
  fusion 
  of 
  Mj 
  and 
  Cui 
  usually 
  short; 
  fork 
  not 
  symmetrical. 
  .5. 
  

  

  5. 
  Wings 
  pubescent; 
  two 
  branches 
  of 
  M 
  Ulomorpha 
  Osten 
  Sacken. 
  

  

  W'ings 
  glabrous 
  (usually); 
  if 
  pubescent, 
  three 
  branches 
  of 
  M 
  at 
  the 
  wing 
  margin. 
  .6. 
  

  

  6. 
  A 
  supernumerary 
  cross 
  vein 
  in 
  cell 
  C 
  Epiphragma 
  Oeten 
  Sacken. 
  

  

  No 
  supernumerary 
  cross 
  vein 
  in 
  cell 
  C 
  7. 
  

  

  7. 
  Antennae 
  of 
  male 
  with 
  long 
  pectinations; 
  usually 
  with 
  more 
  than 
  16 
  segments. 
  

  

  Ctedonia 
  Philippi. 
  

   Antennae 
  of 
  male 
  of 
  various 
  shapes, 
  but 
  never 
  pectinate; 
  IG-segmented 
  8. 
  

  

  8. 
  Sc 
  very 
  long, 
  approximating 
  Rj 
  at 
  wing-margin 
  Lecteria 
  Osten 
  Sacken. 
  

  

  Sc 
  shorter, 
  always 
  distant 
  from 
  R, 
  at 
  the 
  tip 
  Limnophila 
  Macquart. 
  

  

  Genus 
  ISCHNOTHRIX 
  Bigot. 
  

   Ischnothrix 
  Bigot, 
  Miss. 
  Sci. 
  Cape 
  Horn, 
  ZooL, 
  pt. 
  6, 
  1888, 
  pp. 
  7, 
  8, 
  pi. 
  2. 
  

  

  Male. 
  — 
  Kelated 
  to 
  the 
  genus 
  Trichocera. 
  Antennas 
  hair-like, 
  

   two 
  or 
  three 
  times 
  as 
  long 
  as 
  the 
  body, 
  with 
  13 
  or 
  14 
  (?) 
  segments, 
  

   segment 
  1 
  short, 
  stout, 
  second 
  scarcely 
  visible, 
  the 
  remainder 
  

   elongated, 
  cylindrical, 
  attenuated 
  apically; 
  rostrum 
  almost 
  as 
  long 
  

   as 
  the 
  head, 
  horizontal, 
  abruptly 
  truncated 
  at 
  the 
  tip; 
  palpi 
  5 
  

   segmented, 
  the 
  fifth 
  not 
  much 
  longer 
  than 
  the 
  others, 
  indistinctly 
  

   furrowed; 
  three 
  ocelli; 
  feet 
  very 
  long, 
  smooth, 
  not 
  swollen; 
  wings 
  

   margined 
  with 
  short 
  hairs, 
  twice 
  as 
  long 
  as 
  the 
  abdomen; 
  first 
  and 
  

   second 
  longitudinal 
  (Rondani) 
  veins 
  separate 
  at 
  their 
  tips; 
  three 
  

   veins 
  emerge 
  from 
  the 
  pentagonal 
  discal 
  cell, 
  widely 
  separated 
  

   basally, 
  not 
  forked; 
  from 
  the 
  first 
  basal 
  cell, 
  two 
  veins, 
  the 
  outer 
  

   forked; 
  hypopygium 
  small, 
  clasping; 
  abdomen 
  scantily 
  clothed 
  

   with 
  fine 
  hairs 
  on 
  both 
  sides. 
  (Bigot). 
  

  

  ISCHNOTHRIX 
  .ffiTHEREA 
  (Bigot). 
  

  

  Male. 
  — 
  Eight 
  mm. 
  Antennae 
  testaceous, 
  broadly 
  infuscated 
  at 
  

   the 
  tip; 
  palpi 
  black; 
  rostrum 
  brown, 
  tip 
  tinged 
  with 
  black; 
  head 
  

  

  