﻿Heterocera 
  from 
  Costa 
  Rica. 
  175 
  

  

  Mesothen 
  montana, 
  sp. 
  n. 
  

  

  Antennas 
  black. 
  Head, 
  collar, 
  and 
  thorax 
  dark 
  brown. 
  

   Abdomen 
  yellow 
  ; 
  two 
  rows 
  of 
  black 
  dorsal 
  spots 
  on 
  seg- 
  

   ments 
  2-6. 
  Thorax 
  below 
  dark 
  brown. 
  Legs 
  yellow 
  ; 
  tarsi 
  

   and 
  part 
  of 
  hind 
  tibise 
  dark 
  brown. 
  Wings 
  hyaline 
  ; 
  the 
  

   veins 
  and 
  margins 
  narrowly 
  dark 
  brown, 
  widening 
  at 
  apices 
  ; 
  

   the 
  discocellular 
  of 
  fore 
  wings 
  broadly 
  blackish 
  brown. 
  

  

  Expanse 
  39 
  mm. 
  

  

  Hah. 
  Volcano 
  Poas, 
  7000 
  ft. 
  

  

  Mesothen 
  etliela, 
  sp. 
  n. 
  

  

  Palpi 
  brown. 
  Head 
  black 
  ; 
  frons 
  white 
  ; 
  small 
  white 
  

   spots 
  behind 
  antennae. 
  Collar 
  and 
  thorax 
  dark 
  brown, 
  

   patagia 
  black; 
  large 
  white 
  spots 
  on 
  shoulders. 
  Abdomen 
  

   bright 
  yellow, 
  terminally 
  black. 
  Fore 
  legs 
  brown, 
  coxas 
  

   white 
  ; 
  hind 
  legs 
  outwardly 
  black, 
  inwardly 
  buff. 
  Wings 
  

   hyaline, 
  the 
  veins 
  and 
  margins 
  brown. 
  Fore 
  wings 
  : 
  apex 
  

   and 
  tornus 
  more 
  broadly 
  brown, 
  a 
  small 
  white 
  spot 
  at 
  base 
  

   of 
  subcostal 
  vein. 
  

  

  Expanse 
  28 
  mm. 
  

  

  Eab. 
  JSixola. 
  

  

  Chrostosoma 
  sitiona, 
  sp. 
  n. 
  

  

  Palpi, 
  antennas, 
  and 
  head 
  black. 
  Body 
  yellow, 
  the 
  abdo- 
  

   men 
  terminally 
  black. 
  Legs 
  black, 
  coxa? 
  yellow. 
  Wings 
  

   hyaline 
  ; 
  veins 
  and 
  inner 
  margins 
  finely 
  black 
  ; 
  apices 
  very 
  

   broadly 
  black. 
  Fore 
  wings 
  : 
  the 
  costal 
  and 
  outer 
  margin 
  

   rather 
  broadly 
  black 
  ; 
  some 
  yellow 
  at 
  base. 
  

  

  Expanse 
  29 
  mm. 
  

  

  Bab. 
  El 
  Sitio. 
  

  

  Cosmosoma 
  nobilis, 
  sp. 
  n. 
  

  

  Antennas, 
  palpi, 
  and 
  head 
  black 
  ; 
  the 
  frons 
  metallic 
  blue. 
  

   Collar 
  black 
  with 
  metallic-blue 
  spots. 
  Thorax 
  black 
  ; 
  some 
  

   dorsal 
  blue 
  scales 
  ; 
  a 
  large 
  opalescent 
  blue 
  spot 
  on 
  meta- 
  

   thoiax. 
  Abdomen 
  black 
  ; 
  the 
  segments 
  posteriorly 
  narrowly 
  

   yellow 
  ; 
  lateral 
  transverse 
  blue 
  lines 
  and 
  sublateral 
  blue 
  spot 
  ; 
  

   the 
  last 
  two 
  segments 
  metallic 
  blue 
  ; 
  two 
  opalescent 
  spots 
  

   dorsally 
  on 
  first 
  segment. 
  Legs 
  black 
  irrorated 
  with 
  blue. 
  

   The 
  wings 
  hyaline 
  ; 
  veins 
  and 
  margins 
  black, 
  broadly 
  at 
  

   apices. 
  Fore 
  wings 
  : 
  a 
  large 
  black 
  spot 
  at 
  end 
  of 
  cell 
  ; 
  the 
  

   base 
  of 
  costal 
  margin 
  and 
  below 
  cell 
  with 
  metallic-blue 
  

   scales. 
  Fore 
  wings 
  below 
  : 
  the 
  basal 
  third 
  of 
  costa 
  streaked 
  

  

  