﻿492 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM. 
  vol. 
  44. 
  

  

  KEY 
  TO 
  THE 
  GENERA 
  OP 
  THE 
  ERIOPTERINI. 
  

  

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

  

  1. 
  Wings 
  absent 
  Chionea 
  Dallman. 
  

  

  Wings 
  present 
  2. 
  

  

  2. 
  Three 
  branches 
  of 
  M 
  reach 
  the 
  wing-margin 
  3. 
  

  

  Two 
  branches 
  of 
  M 
  reach 
  the 
  wing-margin 
  4 
  . 
  

  

  3. 
  Sc 
  very 
  long; 
  Sci 
  and 
  Ri 
  approximated 
  at 
  their 
  tips 
  Lecteria 
  Osten 
  Racken. 
  

  

  So 
  shorter; 
  Sci 
  and 
  Ri 
  distant 
  at 
  their 
  tips 
  Cladura 
  Osten 
  Sacken. 
  

  

  4. 
  Rj 
  shorter 
  than 
  Ro+a 
  5. 
  

  

  R2 
  longer 
  than 
  Ro+g 
  8. 
  

  

  5. 
  Cross 
  vein 
  r-m 
  absent; 
  Scj 
  very 
  long, 
  approximating 
  R, 
  at 
  their 
  tips; 
  cross 
  vein 
  

  

  r 
  present 
  Mongoma 
  Westwood. 
  

  

  Cross 
  vein 
  r-m 
  distinct; 
  Scj 
  short; 
  no 
  cross 
  vein 
  r 
  ' 
  6. 
  

  

  G. 
  Antennae 
  of 
  the 
  male 
  as 
  long 
  as 
  the 
  body, 
  prominently 
  haired. 
  .Lachnocera 
  Philippi. 
  

  

  Antennae 
  of 
  the 
  male 
  short, 
  normal 
  7. 
  

  

  7.''Sc 
  short 
  ending 
  opposite, 
  or 
  anterior 
  to, 
  the 
  origin 
  of 
  Rs; 
  anal 
  angle 
  of 
  the 
  wing 
  

  

  not 
  prominent 
  Gonomyia 
  Megerle. 
  

  

  Sc 
  long 
  ending 
  near 
  to 
  the 
  fork 
  of 
  Rs; 
  anal 
  angle 
  of 
  the 
  wing 
  prominent. 
  

  

  Sacandaga 
  Alexander. 
  

  

  8. 
  Rs 
  long, 
  normal 
  in 
  position; 
  cell 
  first 
  Rj 
  elongated 
  9. 
  

  

  Rs 
  shortened, 
  its 
  first 
  fork 
  angulated; 
  cell 
  first 
  Rj 
  equilateral 
  or 
  nearly 
  so. 
  

  

  Cryptolnbis 
  Osten 
  Sacken. 
  

  

  9. 
  Second 
  fork 
  of 
  the 
  radial 
  sector 
  on 
  the 
  posterior 
  side, 
  i. 
  e., 
  Rs 
  ends 
  in 
  cell 
  Rj- 
  

  

  Molophilus 
  Curtis. 
  

   Second 
  fork 
  of 
  the 
  radial 
  sector 
  on 
  the 
  anterior 
  side, 
  i. 
  e., 
  Rs 
  ends 
  in 
  cell 
  R3 
  10. 
  

  

  10. 
  A 
  supernumerary 
  cross 
  vein 
  in 
  cell 
  Rj; 
  second 
  anal 
  vein 
  strongly 
  bisinuated. 
  

  

  Ilelobia 
  Le 
  Peletier. 
  

   No 
  supernumerary 
  cross 
  vein 
  in 
  cell 
  Ro; 
  second 
  anal 
  not 
  bisinuated 
  11. 
  

  

  11. 
  Cui 
  tending 
  to 
  turn 
  toward 
  the 
  apex 
  of 
  the 
  wing 
  Erioptera 
  Meigen. 
  

  

  Cuj 
  tending 
  to 
  turn 
  away 
  from 
  the 
  wing 
  apex 
  12. 
  

  

  12. 
  Antennal 
  segments 
  (male) 
  subreniform, 
  nodose; 
  fourth 
  antennal 
  segment 
  like 
  a 
  

  

  recumbent 
  S 
  Sigmalomera 
  Osten 
  Sacken 
  . 
  

  

  Antennal 
  segments 
  of 
  the 
  male 
  not 
  so 
  13. 
  

  

  13. 
  Sides 
  of 
  cell 
  first 
  Mo 
  parallel; 
  Scg 
  near 
  tip 
  of 
  Scj 
  Gnophomyia 
  Osten 
  Sacken. 
  

  

  Sides 
  of 
  cell 
  first 
  M2 
  divergent 
  distad; 
  Sc, 
  retracted 
  toward 
  the 
  wing 
  basis 
  14. 
  

  

  14. 
  The 
  deflected 
  base 
  of 
  Cuj 
  meets 
  M 
  far 
  before 
  the 
  fork; 
  Rs 
  long 
  and 
  straight 
  at 
  its 
  

  

  origin; 
  second 
  fork 
  of 
  Rs 
  skewed 
  forward; 
  termin,al 
  3 
  segments 
  of 
  the 
  antennae 
  

  

  usually 
  abruptly 
  smaller 
  Trimicra 
  Osten- 
  Sacken. 
  

  

  The 
  deflected 
  base 
  of 
  Cuj 
  meets 
  M 
  usually 
  at 
  the 
  fork; 
  Rs 
  shorter, 
  straight; 
  second 
  

   fork 
  of 
  Rs 
  usually 
  symmetrical; 
  flagellar 
  segments 
  of 
  the 
  antennae 
  uniform. 
  

  

  Rhypholophus 
  Kolenati. 
  

  

  I 
  have 
  omitted 
  Polymoria 
  Philippi 
  from 
  this 
  key 
  as 
  it 
  is- 
  veiy 
  

   probably 
  a 
  LirniwpMIa 
  (See 
  Limnophilini). 
  

  

  ' 
  Subgenus 
  Empeda 
  (genus 
  Erioptera) 
  would 
  nm 
  down 
  here, 
  but 
  has 
  cross 
  vein 
  r 
  present. 
  

  

  