﻿HELEID 
  MIDGES, 
  GENUS 
  STILOBEZZIA 
  — 
  ^WIRTH 
  67 
  

  

  Description. 
  — 
  Female: 
  Length 
  1.8 
  mm., 
  wing 
  1.8 
  mm. 
  by 
  0.7 
  mm. 
  

   Head 
  dull 
  brownish, 
  including 
  antennae 
  and 
  palpi, 
  with 
  a 
  few 
  long 
  

   black 
  hairs. 
  Antenna 
  as 
  long 
  as 
  head 
  and 
  thorax 
  combined; 
  flagellar 
  

   segments 
  in 
  proportion 
  of 
  20:15:15:15:15:16:17:18:25:25:25:25:30. 
  

   Palpal 
  segments 
  slender, 
  in 
  proportion 
  of 
  5:10:12:6:10, 
  third 
  segment 
  

   slightly 
  swollen 
  on 
  basal 
  two-thirds, 
  with 
  a 
  small 
  pit 
  at 
  distal 
  fourth. 
  

  

  Thorax 
  dull 
  brown, 
  mesonotum 
  and 
  scutellum 
  dull 
  yellowish, 
  

   postscutellum 
  and 
  pleura 
  dark 
  brown. 
  Mesonotum 
  with 
  moderate 
  

   to 
  long 
  brown 
  hairs 
  in 
  rows; 
  scutellum 
  with 
  about 
  ten 
  long 
  brown 
  

   marginal 
  hairs. 
  Legs 
  dull 
  brown, 
  usually 
  all 
  of 
  forelegs, 
  midtarsus 
  

   and 
  hind 
  tarsus 
  yellowish. 
  Proportions 
  of 
  segments 
  of 
  hind 
  leg 
  as 
  in 
  

   table 
  1; 
  legs 
  moderately 
  slender, 
  hairs 
  fine, 
  not 
  very 
  long 
  except 
  

   those 
  on 
  hind 
  tibia 
  about 
  twice 
  the 
  diameter 
  of 
  segment; 
  basi 
  tarsi 
  

   with 
  ventral 
  spines, 
  three 
  or 
  four 
  on 
  basal 
  half 
  on 
  forelegs 
  and 
  midlegs, 
  

   one 
  at 
  base 
  on 
  hind 
  leg; 
  claws 
  unequal, 
  rather 
  strong 
  and 
  curved, 
  the 
  

   longer 
  nearly 
  as 
  long 
  as 
  fifth 
  segment, 
  the 
  other 
  about 
  half 
  as 
  long. 
  

  

  Wings 
  evenly 
  infuscated, 
  the 
  veins 
  slightly 
  darker, 
  a 
  few 
  macro- 
  

   trichiae 
  at 
  apices 
  of 
  cells 
  Rg 
  and 
  Mi. 
  First 
  radial 
  cell 
  large, 
  about 
  a 
  

   third 
  the 
  length 
  of 
  second; 
  costa 
  extending 
  to 
  0.8 
  wing 
  length; 
  cross- 
  

   vein 
  r-m 
  faint 
  in 
  middle, 
  oblique; 
  petiole 
  of 
  media 
  as 
  long 
  as 
  crossvein. 
  

   Halteres 
  yellow. 
  Abdomen 
  dark 
  brown 
  with 
  short 
  fine 
  hairs; 
  two 
  

   large, 
  slightly 
  unequal 
  ovoid 
  spermathecae 
  and 
  a 
  vestigial 
  third 
  

   present, 
  ducts 
  not 
  sclerotized. 
  

  

  Male: 
  Similar 
  to 
  the 
  female 
  but 
  with 
  the 
  usual 
  sexual 
  differences; 
  

   antennal 
  plumes 
  brownish, 
  knees 
  quite 
  dark. 
  Ninth 
  sternite 
  about 
  

   three 
  times 
  as 
  broad 
  as 
  long, 
  with 
  broad 
  posterior 
  excavation 
  more 
  

   than 
  halfway 
  to 
  base, 
  the 
  membrane 
  bare; 
  ninth 
  tergite 
  rounded, 
  with 
  

   small, 
  submedian, 
  setose, 
  apicolateral 
  lobes. 
  Basistyles 
  simple, 
  twice 
  

   as 
  long 
  as 
  broad 
  ; 
  dististyles 
  0.9 
  times 
  as 
  long 
  as 
  basistyles, 
  slender 
  and 
  

   nearly 
  straight, 
  their 
  apices 
  slightly 
  knobbed. 
  Aedeagus 
  with 
  an 
  

   oblique 
  pair 
  of 
  slightly 
  curved 
  sclerites 
  with 
  distal 
  ends 
  close 
  together, 
  

   sharp-pointed, 
  and 
  bent 
  ventrad; 
  apparently 
  bearing 
  a 
  pair 
  of 
  hyaline 
  

   membranous 
  lobes 
  on 
  posterior 
  margins 
  and 
  attached 
  to 
  membrane 
  

   connecting 
  dorsal 
  roots 
  of 
  basistyles 
  on 
  ventral 
  side 
  of 
  parameres. 
  

   Parameres 
  with 
  broad, 
  platelike, 
  basal 
  apodemes; 
  stems 
  very 
  broad 
  

   and 
  flattened, 
  gradually 
  expanded 
  distad 
  with 
  a 
  short 
  lateral 
  point 
  and 
  

   a 
  longer, 
  slenderer, 
  ventrally 
  bent, 
  distal 
  point, 
  their 
  distal 
  margins 
  

   obliquely 
  truncated. 
  

  

  Types.— 
  VSNM 
  60964, 
  holotype, 
  d", 
  and 
  aflotype, 
  Falls 
  Church, 
  

   Va., 
  July 
  8, 
  1950, 
  Wirth. 
  Paratypes: 
  Virginia: 
  16 
  cTcf 
  , 
  24 
  99, 
  same 
  

   data 
  as 
  type. 
  Georgia: 
  2 
  cf 
  c?", 
  17 
  99, 
  Thomasville, 
  May 
  1949, 
  Palmer. 
  

   Florida: 
  2 
  99, 
  Innerarity 
  Point, 
  May 
  4, 
  1950, 
  Eathert; 
  1 
  9, 
  Panama 
  

   City 
  Beach, 
  May 
  6, 
  1949, 
  McElvey. 
  

  

  