﻿ACADEMY 
  OF 
  SCIENCES. 
  859 
  

  

  dorsal 
  region 
  are 
  nearly 
  white. 
  Head, 
  black, 
  shining, 
  with 
  broad 
  yellow 
  stripe- 
  

   in 
  center. 
  Feet, 
  black 
  ; 
  abdominal 
  legs, 
  flesh-color, 
  banded 
  with 
  black. 
  

  

  Halesidota 
  sobrina. 
  Stretch. 
  

  

  Larva, 
  Head, 
  rough, 
  deep 
  dull 
  black. 
  Body, 
  velvety 
  black, 
  slightly 
  shining. 
  

   In 
  the 
  center 
  of 
  each 
  segment, 
  from 
  five 
  to 
  twelve, 
  inclusive, 
  is 
  a 
  raised 
  tri- 
  

   angular 
  tuft 
  of 
  rich, 
  velvety 
  black 
  hairs. 
  At 
  the 
  base 
  of 
  these 
  is 
  a 
  double 
  row 
  

   of 
  tubercles, 
  from 
  which 
  spring 
  radiating 
  spines 
  arranged 
  in 
  circular 
  form, 
  

   those 
  nearest 
  to 
  the 
  center 
  being 
  bright 
  lemon-yellow, 
  while 
  outwardly 
  they 
  are 
  

   fawn-drab. 
  Laterally, 
  there 
  is 
  another 
  series 
  of 
  double 
  tubercles, 
  with 
  spines 
  

   still 
  arranged 
  in 
  circular 
  form, 
  and 
  entirely 
  fawn-color. 
  From 
  the 
  fourth 
  and 
  

   tenth 
  segments 
  spring 
  two 
  bunches 
  of 
  long 
  black 
  hairs, 
  directed 
  outwardly 
  and 
  

   anteriorly, 
  like 
  those 
  of 
  the 
  genus 
  Orgyia. 
  The 
  yellow 
  spines 
  of 
  the 
  interior 
  

   dorsal 
  tubercles 
  give 
  the 
  appearance 
  of 
  a 
  rich 
  yellow 
  dorsal 
  line. 
  

  

  Under 
  side, 
  dull 
  black 
  ; 
  feet, 
  black 
  ; 
  abdominal 
  legs, 
  yellowish, 
  banded 
  with 
  

   black. 
  Length, 
  1.70 
  inch. 
  

  

  Food 
  plant, 
  Finns 
  insignis, 
  Douglas, 
  (Monterey 
  pine). 
  

  

  Larva 
  taken 
  at 
  Monterey 
  May 
  31st 
  ; 
  changed 
  to 
  chrysalis, 
  June 
  4th 
  — 
  9th. 
  

   Imago 
  appeared 
  June 
  16th 
  — 
  20th. 
  

  

  Chrysalis. 
  Bright 
  chestnut-brown, 
  palest 
  towards 
  the 
  head, 
  enclosed 
  in 
  thin 
  

   web 
  composed 
  of 
  hairs 
  of 
  the 
  larva, 
  through 
  which 
  the 
  chrysalis 
  is 
  indis- 
  

   tinctly 
  seen. 
  The 
  transformation 
  is 
  effected 
  under 
  bark 
  of 
  decaying 
  pine 
  trees, 
  

   and 
  beneath 
  logs. 
  

  

  Halesidota 
  argentata. 
  Pack. 
  

  

  Larva. 
  Precisely 
  similar 
  in 
  size 
  and 
  form 
  to 
  that 
  of 
  H. 
  Sohrina, 
  but 
  differ- 
  

   ing 
  considerably 
  in 
  color. 
  Body, 
  bluish-black, 
  slightly 
  shining. 
  Each 
  seg- 
  

   ment, 
  from 
  five 
  to 
  twelve 
  inclusive, 
  is 
  provided 
  with 
  tuft 
  of 
  velvety 
  black 
  hairs, 
  

   as 
  in 
  the 
  last 
  species, 
  while 
  the 
  fourth 
  and 
  tenth 
  *are 
  armed 
  with 
  long 
  bunches 
  

   of 
  black 
  hairs, 
  those 
  of 
  the 
  tenth 
  being 
  decidedly 
  shorter 
  than 
  in 
  H. 
  Sobrina. 
  

   The 
  stellar 
  pencils 
  of 
  the 
  sides 
  are 
  very 
  dark 
  chestnut-brown, 
  instead 
  of 
  stone 
  

   color, 
  while 
  the 
  yellow 
  spines, 
  which 
  give 
  so 
  bright 
  an 
  appearance 
  to 
  that 
  

   species, 
  are 
  here 
  only 
  very 
  faintly 
  seen. 
  Under 
  side, 
  dull 
  brown 
  ; 
  feet 
  and 
  pro- 
  

   legs 
  with 
  fleshy 
  tinge. 
  Length, 
  1.70 
  inch. 
  

  

  Big 
  trees, 
  Calaveras 
  County, 
  June 
  19th. 
  

  

  Taken 
  on 
  bark 
  of 
  Pinus 
  ponder 
  osa, 
  Dougl., 
  (Yellow 
  pine) 
  and 
  Pinus 
  Lam- 
  

   beriiana, 
  Dough, 
  (Sugar 
  pine). 
  Crawling 
  restlessly 
  about, 
  and 
  eating 
  little 
  

   or 
  no 
  food 
  after 
  capture. 
  In 
  five 
  or 
  six 
  days 
  the 
  seven 
  specimens 
  taken 
  spun 
  a 
  

   thin 
  web 
  similar 
  to 
  H. 
  Sobrina, 
  but 
  very 
  much 
  darker 
  in 
  color. 
  The 
  chrysalis 
  

   itself 
  is, 
  however, 
  paler 
  than 
  its 
  ally, 
  being 
  in 
  all 
  cases 
  the 
  very 
  lightest 
  shade 
  

   of 
  chestnut. 
  Three 
  of 
  my 
  specimens 
  were 
  attacked 
  by 
  Ichneumon. 
  The 
  re- 
  

   mainder 
  gave 
  1 
  (^, 
  3 
  p. 
  It 
  is 
  a 
  source 
  of 
  extreme 
  pleasure 
  to 
  me 
  to 
  be 
  able 
  

   to 
  prove 
  the 
  distinctness, 
  as 
  species, 
  of 
  H. 
  Sobrina 
  and 
  H. 
  Argentata, 
  as 
  the 
  fact 
  

   was 
  one 
  which 
  occasioned 
  considerable 
  doubt 
  to 
  my 
  friend, 
  Mr. 
  Stretch, 
  and 
  

   myself. 
  My 
  larvae 
  from 
  Monterey 
  gave 
  undoubted 
  H. 
  Sobrina, 
  agreeing 
  in 
  

  

  