﻿Heterocera 
  from 
  Costa 
  Rica. 
  271 
  

  

  Expanse 
  42 
  mm. 
  

  

  Hob. 
  Juan 
  Vinas, 
  Sixola. 
  

  

  Very 
  closely 
  allied 
  to 
  Dicentri'a 
  (Meragisa) 
  limosa, 
  Schs. 
  

  

  Psilacron 
  arthuri, 
  sp. 
  n. 
  

  

  (J 
  . 
  Head, 
  collar, 
  and 
  thorax 
  mottled 
  greenish 
  buff 
  and 
  

   brown; 
  a 
  black-brown 
  transverse 
  line 
  on 
  collar. 
  Abdomen 
  

   fuscous 
  above 
  ; 
  basal 
  tufts 
  greenish 
  buff; 
  terminal 
  segment 
  

   and 
  anal 
  hairs 
  buff. 
  Fore 
  wings 
  : 
  some 
  greenish 
  buff 
  at 
  

   base, 
  and 
  a 
  black 
  point 
  below 
  cell 
  followed 
  by 
  a 
  fuscous-grey 
  

   shade 
  limited 
  by 
  the 
  antemedial 
  line, 
  which 
  is 
  fine, 
  black- 
  

   brown, 
  geminate, 
  somewhat 
  oblique 
  from 
  costa 
  to 
  submedian, 
  

   then 
  incurved 
  ; 
  medially 
  and 
  below 
  vein 
  4 
  grey, 
  with 
  darker 
  

   irrorations; 
  a 
  greenish-buff 
  shade 
  between 
  3 
  and 
  4 
  near 
  cell, 
  

   above 
  submedian 
  medially, 
  and 
  about 
  tornus 
  ; 
  a 
  small 
  brown 
  

   spot 
  on 
  discocellular, 
  followed 
  by 
  a 
  curved 
  brownish 
  shade 
  

   consisting 
  of 
  short 
  streaks 
  ; 
  postmedial 
  geminate, 
  interrupted, 
  

   forming 
  short 
  velvety 
  streaks 
  on 
  veins, 
  followed 
  between 
  

   veins 
  4-7 
  by 
  a 
  large 
  fuscous-grey 
  shade; 
  a 
  marginal 
  dark 
  

   grey 
  shade 
  from 
  costa 
  to 
  vein 
  4; 
  a 
  terminal 
  olive-brown 
  

   line; 
  terminal 
  black 
  streaks 
  on 
  veins; 
  cilia 
  whitish, 
  with 
  

   fuscous 
  spots. 
  Hind 
  wings 
  fuscous 
  grey, 
  the 
  veins 
  and 
  inner 
  

   margin 
  darker; 
  a 
  geminate 
  postmedial 
  line 
  on 
  costa 
  filled 
  in 
  

   with 
  greenish 
  buff. 
  

  

  Expanse 
  37 
  mm. 
  

  

  ? 
  . 
  Fore 
  wings 
  olive-brown, 
  shaded 
  with 
  fuscous 
  and 
  dark 
  

   grey, 
  the 
  lines 
  as 
  in 
  the 
  male 
  ; 
  a 
  large 
  whitish 
  patch 
  on 
  outer 
  

   margin 
  from 
  vein 
  2 
  to 
  just 
  above 
  vein 
  4. 
  Hind 
  wings 
  with 
  

   indistinct 
  medial 
  and 
  geminate 
  postmedial 
  fuscous 
  lines. 
  

  

  Expanse 
  41 
  mm. 
  

  

  Hub. 
  Juan 
  Vinas. 
  

  

  Psilacron 
  discolor, 
  sp. 
  n. 
  

  

  J 
  1 
  . 
  Head, 
  collar, 
  and 
  thorax 
  mottled 
  brown 
  and 
  greenish. 
  

   Abdomen 
  above 
  greyish 
  brown 
  ; 
  dorsal 
  greenish 
  tufts 
  at 
  base. 
  

   Fore 
  wings 
  yellowish 
  green, 
  probably 
  faded, 
  shaded 
  with 
  

   fuscous 
  grey 
  in 
  and 
  below 
  cell 
  medially; 
  a 
  subterminal 
  dull 
  

   fuscous-grey 
  shade 
  from 
  vein 
  4-7 
  ; 
  a 
  large 
  antemedial 
  

   black 
  space 
  from 
  below 
  cell 
  to 
  inner 
  margin 
  ; 
  a 
  velvety 
  black 
  

   semilunar 
  spot 
  at 
  end 
  of 
  cell, 
  and 
  an 
  inward 
  fuscous 
  shade 
  

   below 
  it 
  ; 
  a 
  fine 
  incurved 
  dark 
  line 
  from 
  costa 
  before 
  sub- 
  

   terminal 
  shade 
  to 
  vein 
  3, 
  geminate 
  from 
  vein 
  7-3 
  ; 
  a 
  sub- 
  

   terminal 
  fuscous 
  shade 
  between 
  veins 
  2 
  and 
  3 
  ; 
  a 
  paler 
  mar- 
  

   ginal 
  line, 
  lunular 
  below 
  vein 
  4. 
  Hind 
  wings 
  brownish, 
  

   tinged 
  with 
  fuscous 
  grey. 
  

  

  