﻿58 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM 
  vol. 
  103 
  

  

  male 
  antenna 
  with 
  well-developed 
  plumes. 
  Mesonotum 
  usually 
  with 
  

   few 
  or 
  no 
  long 
  bristles; 
  humeral 
  pits 
  present 
  but 
  usually 
  inconspicuous. 
  

   All 
  legs 
  slender; 
  femora 
  without 
  spines 
  or 
  (in 
  Eukraiohelea) 
  with 
  a 
  

   few 
  on 
  forelegs; 
  basitarsus 
  and 
  fifth 
  segment 
  with 
  or 
  without 
  ventral 
  

   spines; 
  fourth 
  segment 
  cordiform, 
  fifth 
  not 
  enlarged; 
  female 
  claws 
  

   large 
  and 
  very 
  unequal 
  or 
  a 
  single 
  long 
  claw 
  with 
  basal 
  barb 
  on 
  each 
  

   leg, 
  male 
  claws 
  small 
  and 
  equal; 
  empodium 
  absent. 
  Wing 
  rather 
  

   long; 
  microtrichiae 
  present; 
  macro 
  trichiae 
  present 
  toward 
  tip 
  (in 
  

   Neostilobezzia) 
  or 
  absent; 
  costa 
  extending 
  to 
  two-thirds 
  wing 
  length 
  

   or 
  more; 
  usually 
  two 
  radial 
  cells, 
  second 
  much 
  larger 
  than 
  first, 
  

   which 
  may 
  be 
  entirely 
  absent 
  (in 
  Eukraiohelea) 
  or 
  greatly 
  reduced; 
  

   intercalary 
  fork 
  distinct; 
  crossvein 
  r-m 
  more 
  or 
  less 
  oblique; 
  median 
  

   fork 
  with 
  long 
  petiole, 
  M2 
  not 
  interrupted 
  at 
  base; 
  anal 
  vein 
  straight, 
  

   not 
  interrupted 
  in 
  middle. 
  Male 
  genitalia 
  with 
  basistyles 
  simple 
  or 
  

   with 
  lobe 
  on 
  inner 
  margins 
  ; 
  dististyles 
  long 
  ; 
  ninth 
  sternite 
  very 
  short 
  ; 
  

   ninth 
  tergite 
  usually 
  rounded 
  caudad 
  with 
  setigerous 
  apicolateral 
  

   lobes; 
  aedeagus 
  reduced 
  to 
  a 
  pair 
  of 
  oblique 
  lateral 
  sclerites; 
  parameres 
  

   a 
  pair 
  of 
  large, 
  highly 
  sclerotized, 
  greatly 
  modified, 
  submedian 
  proc- 
  

   esses 
  with 
  flaring 
  basal 
  apodemes. 
  

  

  Keys 
  to 
  the 
  Nearctic 
  species 
  of 
  Stilobezzia 
  

  

  Females 
  

  

  1. 
  Only 
  one 
  long 
  radial 
  cell 
  present; 
  fore 
  femur 
  with 
  2 
  or 
  3 
  ventral 
  spines 
  

  

  (subgenus 
  Eukraiohelea) 
  1. 
  elegantula 
  (Johannsen) 
  

  

  Two 
  radial 
  cells 
  present 
  ; 
  fore 
  femur 
  unarmed 
  2 
  

  

  2(1). 
  Wing 
  with 
  macrotrichiae 
  at 
  tip 
  (subgenus 
  Neostilobezzia) 
  3 
  

  

  Wing 
  entirely 
  bare 
  (subgenus 
  Stilobezzia) 
  5 
  

  

  3 
  (2). 
  Body 
  hairs 
  very 
  strong 
  and 
  erect; 
  wings 
  hyaline; 
  legs, 
  scutellum, 
  and 
  

  

  halteres 
  yellow 
  3. 
  lutea 
  (Malloch) 
  

  

  Body 
  hairs 
  soft 
  and 
  decumbent; 
  midlegs 
  and 
  hind 
  legs 
  brown 
  4 
  

  

  4(3). 
  Wing 
  infuscated 
  brown; 
  scutellum 
  and 
  halteres 
  yellowish. 
  

  

  4. 
  stonci, 
  new 
  species 
  

   Wing 
  hyaline; 
  scutellum 
  and 
  halteres 
  brownish 
  2. 
  fuscula 
  Wirth 
  

  

  5 
  (2). 
  Wing 
  with 
  2 
  or 
  3 
  dark 
  spots 
  on 
  anterior 
  margin 
  6 
  

  

  Wing 
  hyaline, 
  unmarked 
  9 
  

  

  6 
  (5). 
  Shining 
  yellow; 
  mesonotum 
  polished 
  yellow, 
  with 
  pair 
  of 
  longitudinal 
  

  

  brown 
  bands, 
  anterior 
  spine 
  absent; 
  legs 
  yellow, 
  narrow 
  apices 
  of 
  hind 
  

   femur 
  and 
  tibia 
  brown; 
  wing 
  hyaline, 
  with 
  brown 
  spots 
  at 
  crossvein 
  

  

  and 
  apex 
  of 
  second 
  radial 
  cell 
  9. 
  coquilletti 
  Kieffer 
  

  

  . 
  Mesonotum 
  bro^yn 
  with 
  silvery, 
  pruinose 
  areas 
  and 
  prominent 
  anterior 
  

   spine; 
  legs 
  extensively 
  brown 
  banded 
  or 
  punctate; 
  wing 
  brownish, 
  

   anterior 
  margin 
  with 
  2 
  or 
  3 
  dark 
  spots 
  7 
  

  

  7 
  (6). 
  Femora 
  and 
  tibiae 
  extensively 
  yellow, 
  with 
  small 
  brown 
  spots 
  at 
  bases 
  of 
  

  

  hairs; 
  wing 
  hyaline, 
  with 
  two 
  brown 
  spots; 
  abdomen 
  mostly 
  yellowish 
  

  

  above 
  14. 
  punctipes, 
  new 
  species 
  

  

  Femora 
  and 
  tibiae 
  brown 
  with 
  yellowish 
  rings; 
  wing 
  infuscated, 
  with 
  2 
  

   or 
  3 
  brown 
  spots 
  and 
  a 
  subapical 
  pale 
  area; 
  abdomen 
  black 
  above 
  with 
  

   narrow, 
  distal, 
  silvery 
  pruinose, 
  segmental 
  bands 
  8 
  

  

  