﻿148 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM 
  ^°^- 
  "^ 
  

  

  9. 
  Monohelea 
  {Monohelea) 
  stonei, 
  new 
  species 
  

  

  Figures 
  18, 
  e; 
  19, 
  i 
  

  

  Diagnostic 
  characters. 
  — 
  A 
  yellowish 
  gray, 
  pruinose 
  species 
  with 
  

   maculate 
  wings; 
  scutellum 
  yellow 
  with 
  brown 
  center; 
  legs 
  dark, 
  

   abdomen 
  dull 
  gray 
  pruinose 
  above. 
  

  

  Description. 
  — 
  Female: 
  Length 
  2.0 
  mm., 
  wing 
  1.5 
  mm. 
  by 
  0.7 
  mm. 
  

   Head 
  yellowish, 
  vertex 
  pruinose, 
  pale 
  gray; 
  antenna 
  with 
  pedicel 
  and 
  

   bases 
  of 
  flagellar 
  segments 
  yellow, 
  apices 
  of 
  short 
  segments 
  and 
  all 
  of 
  

   long 
  distal 
  segments 
  and 
  palpi 
  brown; 
  proportions 
  of 
  flagellar 
  seg- 
  

   ments 
  15:10:10:10:10:10:12:12:18:18:18:18:24. 
  Palpal 
  segments 
  

   in 
  proportion 
  of 
  5 
  :8 
  : 
  15 
  : 
  10 
  : 
  15, 
  third 
  segment 
  scarcely 
  swollen, 
  with 
  a 
  

   rather 
  large 
  sensory 
  pit 
  at 
  midlength. 
  

  

  Mesonotum 
  yellowish 
  gray 
  pruinose, 
  with 
  tiny 
  brown 
  dots 
  at 
  the 
  

   bases 
  of 
  the 
  brownish 
  mesonotal 
  hairs. 
  Scutellum 
  yellow, 
  brown 
  in 
  

   middle, 
  with 
  four 
  moderate 
  marginal 
  hairs 
  and 
  a 
  few 
  fine 
  setae. 
  

   Postscutellum 
  and 
  pleura 
  pruinose 
  dark 
  brown. 
  Coxae 
  brown; 
  

   trochanters, 
  femora, 
  and 
  tibiae 
  light 
  brown 
  on 
  forelegs 
  and 
  midlegs, 
  

   black 
  on 
  hind 
  legs; 
  all 
  knees 
  prominently 
  yellowish, 
  tarsi 
  yellow. 
  

   Hind 
  femur 
  and 
  hind 
  tibia 
  moderately 
  thickened; 
  basitarsus 
  with 
  a 
  

   slender 
  spine 
  at 
  base, 
  distal 
  tarsal 
  segments 
  on 
  hind 
  legs 
  each 
  with 
  

   a 
  fine 
  apical 
  spine; 
  a 
  single 
  long 
  claw 
  on 
  each 
  hind 
  leg. 
  Proportions 
  

   of 
  segments 
  of 
  hind 
  leg 
  as 
  in 
  table 
  1 
  . 
  

  

  Wing 
  grayish 
  hyaline, 
  with 
  two 
  prominent, 
  black 
  spots 
  and 
  fainter 
  

   posterior 
  infumation 
  as 
  figured; 
  fu-st 
  radial 
  cell 
  about 
  half 
  as 
  long 
  as 
  

   second. 
  Halteres 
  infuscated. 
  

  

  Abdomen 
  dark 
  brown, 
  entire 
  dorsum 
  pruinose 
  gray 
  except 
  for 
  a 
  

   pair 
  of 
  small 
  lateral 
  spots 
  and 
  a 
  pair 
  of 
  submedian 
  sensory 
  dots 
  on 
  

   each 
  segment, 
  polished 
  brown. 
  Spermathecae 
  two, 
  subequal, 
  ovoid, 
  

   each 
  with 
  a 
  very 
  short 
  sclerotized 
  duct. 
  

  

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

   antennal 
  plume 
  golden 
  at 
  base, 
  dark 
  brown 
  toward 
  apex. 
  Ninth 
  

   sternite 
  three 
  times 
  as 
  broad 
  as 
  long, 
  with 
  a 
  narrow, 
  median, 
  poste- 
  

   rior 
  lobe 
  bearing 
  two 
  long 
  hau-s 
  extending 
  into 
  the 
  concave 
  base 
  of 
  the 
  

   aedeagus; 
  sternite 
  spiculate 
  on 
  posterior 
  half; 
  ninth 
  tergite 
  as 
  long 
  as 
  

   basistyles, 
  tapered 
  to 
  the 
  truncated 
  apex, 
  bearing 
  a 
  pair 
  of 
  short, 
  

   rounded, 
  apicolateral 
  processes. 
  Basistyles 
  about 
  twice 
  as 
  long 
  as 
  

   broad, 
  simple, 
  very 
  convex 
  on 
  outer 
  sides; 
  dististyles 
  about 
  0.7 
  as 
  long 
  

   as 
  basistyles, 
  nearly 
  straight 
  and 
  stout 
  to 
  apices. 
  Aedeagus 
  with 
  

   base 
  as 
  broad 
  as 
  the 
  lobe 
  of 
  ninth 
  sternite, 
  a 
  slight 
  sub-basal 
  swelling, 
  

   a 
  second 
  swelling 
  at 
  midlength, 
  with 
  distal 
  half 
  cleft 
  into 
  a 
  pair 
  of 
  

   attenuated, 
  submedian, 
  pointed 
  blades 
  attaining 
  0.8 
  length 
  of 
  basi- 
  

   styles. 
  Parameres 
  consisting 
  of 
  a 
  pau' 
  of 
  very 
  irregular 
  processes. 
  

  

  