﻿102 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM 
  vol. 
  w 
  

  

  legs 
  testaceous 
  to 
  stramineous, 
  except 
  for 
  a 
  narrow 
  fuscous 
  band 
  at 
  

   apex 
  of 
  profemora 
  and 
  a 
  similar 
  band 
  in 
  middle 
  of 
  protibiae. 
  Teg- 
  

   mina 
  mostly 
  piceous, 
  a 
  dull 
  testaceous 
  spot 
  on 
  each 
  side 
  of 
  piceous 
  

   costal 
  eminence, 
  apical 
  cells 
  from 
  node 
  to 
  Ms 
  and 
  intervening 
  veins 
  dull 
  

   yellow 
  with 
  two 
  fuscous 
  interruptions, 
  middle 
  portion 
  of 
  subapical 
  

   veins 
  paler 
  than 
  corium, 
  veins 
  of 
  corium 
  chiefly 
  red, 
  basally 
  infuscate 
  

   and 
  interrupted 
  with 
  dull 
  yellow 
  spots. 
  Wings 
  smoky, 
  veins 
  con- 
  

   colorous, 
  margin 
  red. 
  

  

  Anal 
  segment 
  narrow, 
  lateral 
  apical 
  angles 
  slightly 
  deflexed. 
  

   Aedeagus 
  tubular 
  in 
  basal 
  half, 
  with 
  a 
  minute 
  bicuspidate 
  process 
  

   near 
  base 
  of 
  flagellum, 
  two 
  stout 
  spines 
  at 
  base 
  of 
  flagellum, 
  one 
  on 
  

   right 
  side, 
  the 
  other 
  distally, 
  both 
  directed 
  dorsally, 
  a 
  transparent 
  

   spine 
  on 
  flagellum 
  at 
  middle, 
  apex 
  of 
  flagellum 
  lobate 
  with 
  a 
  large 
  

   spine 
  below 
  it 
  on 
  left 
  ; 
  two 
  small 
  spines 
  on 
  right. 
  Genital 
  styles 
  nar- 
  

   row, 
  membranous 
  dorsally 
  distad 
  of 
  middle, 
  with 
  a 
  scroll-like 
  process 
  

   in 
  middle 
  of 
  dorsal 
  margin. 
  

  

  Type.—U.S.^M. 
  No. 
  57099. 
  

  

  Described 
  from 
  one 
  male 
  collected 
  at 
  Iquitos, 
  Peru, 
  by 
  R. 
  C. 
  Shan- 
  

   non 
  (March 
  1931). 
  The 
  basal 
  reflection 
  of 
  the 
  costal 
  margin 
  recalls 
  

   the 
  similar 
  modification 
  found 
  in 
  Sayiana 
  Ball, 
  but 
  Iquitosa 
  differs 
  

   from 
  Ball's 
  type, 
  with 
  which 
  it 
  has 
  been 
  compared, 
  in 
  the 
  more 
  pointed 
  

   head, 
  the 
  shape 
  of 
  the 
  antennae, 
  and 
  the 
  shape 
  and 
  venation 
  of 
  the 
  

   tegmina. 
  

  

  Family 
  ACHILIDAE 
  

  

  Subfamily 
  APATESONINAE 
  

  

  Genus 
  ATESON 
  Metcalf 
  

  

  Ateson 
  Metcalf, 
  Bull. 
  Mus. 
  Comp. 
  Zool., 
  vol. 
  82, 
  No. 
  5, 
  pp. 
  367, 
  369, 
  1938. 
  (Geno- 
  

   type, 
  A. 
  marmoratum 
  Metcalf, 
  loc. 
  cit., 
  p. 
  369.) 
  

  

  ATESON 
  SEMILUTEUM, 
  newr 
  species 
  

  

  Plate 
  3, 
  Figures 
  42-47 
  

  

  Male. 
  — 
  ^Length, 
  5.5 
  mm. 
  ; 
  tegmen, 
  8.0 
  mm. 
  

  

  Frons 
  with 
  lateral 
  margins 
  ampliate 
  and 
  raised 
  between 
  level 
  of 
  

   antennae 
  and 
  suture, 
  median 
  carina 
  terminating 
  distally 
  against 
  a 
  

   transverse 
  ridge, 
  median 
  carina 
  of 
  clypeus 
  distinct 
  except 
  at 
  base. 
  

  

  Testaceous 
  ; 
  abdominal 
  sclerites 
  infuscate. 
  Tegmina 
  yellowish, 
  fus- 
  

   cous 
  at 
  base 
  and 
  chiefly 
  so 
  distad 
  of 
  nodal 
  line, 
  with 
  a 
  pale 
  area 
  in 
  the 
  

   subapical 
  cells 
  of 
  M 
  and 
  Cuia, 
  transA^erse 
  veins 
  mostly 
  pale. 
  Wings 
  

   hyaline 
  at 
  base, 
  smoky 
  near 
  apical 
  margin, 
  veins 
  fuscous. 
  

  

  Anal 
  segment 
  of 
  male 
  short. 
  Pygofer 
  with 
  lateral 
  angles 
  scarcely 
  

   produced, 
  pointed, 
  slightly 
  falcate, 
  medioventral 
  process 
  twice 
  as 
  

   broad 
  as 
  long, 
  distally 
  shallowly 
  trilobed, 
  the 
  middle 
  lobe 
  largest. 
  

  

  