﻿XVI 
  

  

  of 
  a 
  slight 
  shaded 
  line 
  near 
  the 
  base, 
  suggestive 
  of 
  another 
  segment. 
  

   Above 
  the 
  claws 
  is 
  a 
  hair 
  nearly 
  equaling 
  the 
  tarsus 
  in 
  length; 
  one 
  

   other 
  hair 
  is 
  visible 
  on 
  the 
  same 
  side 
  toward 
  the 
  proximal 
  end; 
  while 
  

   the 
  under 
  side 
  of 
  the 
  tarsus 
  carries 
  a 
  hair, 
  located 
  a 
  short 
  distance 
  

   toward 
  the 
  tibia, 
  and 
  still 
  nearer 
  to 
  the 
  tibia 
  four 
  comparatively 
  long 
  

   hairs 
  are 
  visible. 
  A 
  few 
  hairs 
  are 
  also 
  visible 
  on 
  the 
  femur 
  and 
  tibia. 
  

   (Plate 
  II, 
  Fig. 
  2.) 
  

  

  The 
  Pupa 
  of 
  the 
  Winged 
  Form. 
  

  

  "The 
  pupjp 
  are 
  similar 
  to 
  the 
  larva' 
  with 
  the 
  exception 
  of 
  the 
  wing- 
  pads. 
  

   The 
  thorax 
  is 
  yellowish 
  or 
  i"eddish,the 
  wing-pads 
  yellow 
  from 
  the 
  wings 
  show- 
  

   ing 
  through, 
  and 
  appear 
  washed 
  with 
  brown 
  from 
  the 
  darker 
  color 
  of 
  the 
  outer 
  

   membrane. 
  The 
  abdomen 
  is 
  reddish, 
  darker 
  than 
  the 
  thorax. 
  Occasionally 
  

   patches 
  of 
  woolly 
  substance 
  are 
  seen 
  on 
  various 
  parts 
  of 
  the 
  body. 
  The 
  an- 
  

   tennae 
  are 
  folded 
  back 
  against 
  the 
  head, 
  though 
  not 
  joined; 
  the 
  legs 
  are 
  free." 
  

   — 
  OSBORN, 
  

  

  No 
  study 
  of 
  the 
  pup^e 
  was 
  made 
  at 
  Urban 
  a. 
  

  

  The 
  Winged 
  Form. 
  

  

  "The 
  winged 
  form 
  is, 
  when 
  it 
  first 
  issues 
  from 
  the 
  pupa, 
  light 
  reddisli 
  in 
  

   color, 
  the 
  wings 
  are 
  very 
  white, 
  expanding 
  rapidly 
  and 
  becoming 
  transparent, 
  

   while 
  the 
  body 
  gradually 
  becomes 
  darker 
  till 
  nearly 
  black. 
  Tlie 
  antenna? 
  are 
  

   tive- 
  jointed, 
  short; 
  the 
  tarsi 
  one-jointed 
  with 
  rudimentary 
  first 
  joint 
  and 
  two 
  

   ungues. 
  The 
  wings 
  are 
  four, 
  folding 
  roof-like 
  over 
  the 
  body, 
  the 
  anterior 
  

   ones 
  being 
  furnished 
  with 
  a 
  strong 
  sub-costal 
  vein 
  which 
  is 
  branched 
  at 
  one 
  

   thii'd 
  the 
  distance 
  from 
  the 
  base, 
  the 
  lower 
  branch 
  running 
  parallel 
  for 
  some 
  

   distance, 
  then 
  turning 
  obliquely 
  toward 
  the 
  posterior 
  margin; 
  also 
  from 
  this 
  

   branch 
  two 
  oblique 
  discoidal 
  veins 
  running 
  co 
  the 
  posterior 
  margin. 
  The 
  

   stigma 
  is 
  indistinct. 
  The 
  posterior 
  wings 
  have 
  a 
  sub-costal 
  vein 
  with 
  no 
  

   branch 
  veins. 
  This 
  venation 
  applies 
  to 
  the 
  inner 
  structure 
  of 
  the 
  wing 
  when 
  

   magnified 
  forty 
  or 
  more 
  diameters. 
  Under 
  a 
  simple 
  lens 
  of 
  low 
  power 
  and 
  

   w'ithout 
  transmitted 
  light, 
  the 
  venation 
  appears 
  quite 
  different 
  and 
  is 
  as 
  fol- 
  

   lows: 
  A 
  strong 
  vein 
  running 
  to 
  the 
  costa 
  slightly 
  before 
  the 
  apex 
  and 
  send- 
  

   ing 
  a 
  short 
  oblique 
  branch 
  to 
  the 
  costa 
  at 
  about 
  its 
  middle, 
  inclosing 
  the 
  

   stigma. 
  From 
  the 
  main 
  vein 
  three 
  oblique 
  veins 
  passing 
  to 
  near 
  ttie 
  posterior 
  

   border 
  of 
  the 
  wing. 
  There 
  is 
  a 
  slight 
  fold 
  of 
  the 
  posterior 
  border 
  at 
  the 
  ter- 
  

   mination 
  of 
  the 
  first 
  oblique 
  vein 
  for 
  the 
  reception 
  of 
  the 
  costal 
  hook 
  of 
  the 
  

   hind 
  wing. 
  The 
  hook 
  on 
  the 
  front 
  border 
  of 
  the 
  hind 
  wing 
  which 
  slips 
  into 
  

   the 
  fold 
  of 
  the 
  front 
  wing, 
  holding 
  the 
  two 
  wings 
  together 
  so 
  that 
  they 
  may 
  act 
  as 
  

   one, 
  is 
  composed 
  in 
  this 
  species 
  of 
  two 
  curved 
  rods 
  of 
  chitine." 
  — 
  Osborn. 
  

  

  Some 
  variations 
  from 
  the 
  above 
  description 
  are 
  shown 
  by 
  the 
  

   specimens 
  taken 
  at 
  Urbana. 
  In 
  a 
  number 
  of 
  them 
  the 
  subcostal 
  vein 
  

   does 
  not 
  branch, 
  the 
  vein 
  spoken 
  of 
  by 
  Professor 
  Osborn 
  as 
  a 
  

   branch 
  lying 
  close 
  beside 
  the 
  subcostal 
  and 
  extending 
  to 
  the 
  base 
  

   of 
  the 
  wing 
  (Plate 
  1, 
  Fig. 
  4). 
  In 
  others 
  it 
  appears 
  as 
  a 
  branch. 
  

   The 
  curved 
  rods 
  of 
  chitin 
  on 
  the 
  hind 
  wing 
  are 
  usually 
  three, 
  some- 
  

   times 
  two, 
  in 
  one 
  case 
  three 
  on 
  one 
  wing, 
  two 
  on 
  the 
  other. 
  Average 
  

   measurements 
  were 
  as 
  follows: 
  Entire 
  insect 
  0.46 
  mm. 
  X 
  0.92 
  mm.; 
  

   front 
  wing 
  1.4 
  mm. 
  X 
  0.6 
  mm.; 
  hind 
  wing 
  0.95 
  mm. 
  X 
  0.83 
  mm.; 
  an- 
  

   tennte 
  0.28 
  mm.; 
  tarsus 
  0.07 
  mm.; 
  tibia 
  0.2() 
  mm.; 
  femur 
  0.19 
  mm. 
  

  

  The 
  leg 
  of 
  the 
  adult 
  winged 
  form 
  has 
  its 
  femur 
  and 
  tibia 
  covered 
  

   with 
  scattered 
  tubercles, 
  each 
  tubercle 
  bearing 
  a 
  hair; 
  these 
  tubercles 
  

   are 
  thick 
  on 
  the 
  tibia, 
  fewer 
  on 
  the 
  femur, 
  none 
  on 
  the 
  tarsus. 
  The 
  

  

  