﻿TENT 
  CATERPILLAR 
  — 
  SNODGRASS. 
  

  

  361 
  

  

  SpmO 
  

  

  OvDO 
  

  

  The 
  body 
  of 
  the 
  female, 
  on 
  the 
  other 
  hand, 
  contains 
  no 
  fat 
  tissue 
  

   when 
  she 
  emerges, 
  while 
  her 
  ovaries 
  are 
  full 
  of 
  mature 
  eggs 
  ready 
  

   to 
  be 
  laid 
  as 
  soon 
  as 
  the 
  fertilizing 
  element 
  is 
  received 
  from 
  the 
  male. 
  

   One 
  specimen 
  examined 
  contained 
  

   289 
  eggs, 
  an 
  average 
  of 
  36 
  for 
  each 
  

   of 
  the 
  eight 
  tubes 
  of 
  the 
  ovaries 
  

   (fig. 
  20, 
  Ov). 
  The 
  material 
  that 
  

   will 
  form 
  the 
  covering 
  of 
  the 
  eggs 
  

   when 
  laid 
  is 
  a 
  clear 
  brown 
  liquid 
  

   contained 
  in 
  two 
  great 
  sacs 
  {Res) 
  

   that 
  open 
  into 
  the 
  oviduct 
  (OvD). 
  

   Each 
  is 
  the 
  reservoir 
  of 
  a 
  long 
  

   tubular 
  gland 
  (Gl). 
  The 
  liquid 
  

   must 
  be 
  somehow 
  mixed 
  with 
  air 
  

   when 
  it 
  is 
  extruded 
  over 
  the 
  eggs 
  

   to 
  give 
  the 
  covering 
  its 
  frothy 
  

   structure. 
  It 
  soon 
  sets 
  into 
  a 
  jelly- 
  

   like 
  substance, 
  then 
  becomes 
  firm 
  

   but 
  elastic 
  like 
  rubber, 
  and 
  eventu- 
  

   ally 
  becomes 
  dry 
  and 
  brittle. 
  

  

  The 
  date 
  of 
  the 
  egg 
  laying 
  de- 
  

   pends 
  on 
  the 
  latitude 
  of 
  the 
  re- 
  

   gion 
  the 
  moth 
  inhabits, 
  varying 
  

   from 
  the 
  middle 
  of 
  May 
  in 
  the 
  

   Southern 
  States 
  to 
  the 
  end 
  of 
  June 
  

   in 
  the 
  North. 
  While 
  the 
  eggs 
  will 
  

  

  not 
  hatch 
  till 
  the 
  following 
  spring, 
  they 
  nevertheless 
  begin 
  to 
  develop 
  

   at 
  once, 
  and 
  within 
  six 
  weeks 
  the 
  caterpillars 
  may 
  be 
  found 
  fully 
  

   formed 
  inside 
  of 
  them 
  (fig. 
  21, 
  B) 
  . 
  Each 
  has 
  its 
  head 
  against 
  the 
  top 
  

  

  of 
  the 
  shell 
  and 
  its 
  body 
  bent 
  

  

  U-shaped, 
  with 
  the 
  tail 
  end 
  

   turned 
  to 
  one 
  side. 
  The 
  hairs 
  

   of 
  the 
  body 
  are 
  all 
  brushed 
  

   forward 
  and 
  form 
  a 
  thin 
  

   cushion 
  about 
  the 
  poor 
  crea- 
  

   ture, 
  which 
  for 
  crimes 
  un- 
  

   committed 
  is 
  sentenced 
  to 
  

   eight 
  months' 
  solitary 
  con- 
  

   finement 
  in 
  this 
  inhuman 
  po- 
  

   sition. 
  Yet, 
  if 
  artificially 
  liberated, 
  the 
  prisoner 
  takes 
  no 
  advantage 
  

   of 
  the 
  freedom 
  offered. 
  Though 
  it 
  can 
  move 
  a 
  little, 
  it 
  remains 
  

   coiled 
  (A) 
  and 
  will 
  fold 
  up 
  again 
  if 
  forcibly 
  straightened, 
  thus 
  

   asserting 
  that 
  it 
  is 
  more 
  comfortable 
  than 
  it 
  looks. 
  

  

  Fig. 
  20. 
  — 
  Internal 
  organs 
  of 
  a 
  female 
  

   moth, 
  showing 
  the 
  'base 
  of 
  one 
  ovary 
  

   (Ov), 
  the 
  common 
  oviduct 
  (OvD) 
  and 
  

   its 
  opening 
  to 
  the 
  exterior 
  (OvDO), 
  

   the 
  spermatheca 
  (8pm), 
  connected 
  with 
  

   the 
  oviduct 
  bv 
  a 
  short 
  tube, 
  and 
  its 
  

   opening 
  to 
  the 
  exterior 
  (SpmO). 
  The 
  

   egg 
  covering 
  is 
  formed 
  as 
  a 
  brown 
  

   liquid 
  in 
  the 
  glands 
  (Gl) 
  and 
  accumu- 
  

   lates 
  in 
  the 
  large 
  sacs 
  (Res) 
  which 
  

   open 
  into 
  the 
  terminal 
  part 
  of 
  the 
  

   oviduct. 
  

  

  -A, 
  young 
  tent 
  caterpillar 
  taken 
  from 
  

   an 
  egg 
  July 
  29 
  ; 
  B, 
  caterpillar 
  in 
  natural 
  

   position 
  in 
  the 
  egg. 
  

  

  