﻿CANKER 
  WORMS: 
  DIFFERENCES 
  BETWEEN 
  THEM. 
  

  

  161 
  

  

  where 
  they 
  are 
  always 
  distinct 
  and 
  divide 
  

   the 
  wing 
  Into 
  four 
  subeqnal 
  parts. 
  No 
  

   white 
  costal 
  spot. 
  (PI. 
  Ill, 
  Fig. 
  3, 
  a.) 
  

  

  A 
  pale, 
  jagged, 
  subterminal 
  band, 
  cor- 
  

   responding 
  in 
  some 
  degree 
  to 
  the 
  outer- 
  

   most 
  band 
  in 
  pometaria, 
  but 
  running 
  out 
  

   to 
  apex, 
  where 
  it 
  is 
  always 
  sharply 
  re- 
  

   lieved 
  posteriorly 
  by 
  a 
  dark 
  mark, 
  and 
  

   often 
  the 
  whole 
  length 
  by 
  dusky 
  shad- 
  

   ings. 
  

  

  Hind-wings 
  with 
  the 
  costal 
  vein 
  bifur- 
  

   cating 
  at, 
  or 
  but 
  little 
  beyond, 
  the 
  discal, 
  

   and 
  with 
  the 
  independent 
  or 
  vein 
  5 
  faint. 
  

   (PI. 
  Ill, 
  Fig. 
  2, 
  &.) 
  

  

  Color 
  pale-ash 
  or 
  very 
  light 
  gray, 
  with 
  

   a 
  dusky 
  discal 
  dot. 
  

  

  No 
  Avhite 
  band, 
  and 
  rarely 
  any 
  margin- 
  

   al 
  dots. 
  

  

  Under 
  surface 
  with 
  a 
  more 
  or 
  less 
  dis- 
  

   tinct 
  dusky 
  spot 
  on 
  each 
  wing, 
  the 
  front 
  

   wing 
  having 
  in 
  addition 
  a 
  dusky 
  line 
  

   along 
  median 
  vein 
  and 
  spot 
  on 
  costa 
  to- 
  

   ward 
  apex. 
  No 
  pale 
  bands. 
  

  

  Female 
  — 
  Antennce 
  generally 
  with 
  but 
  

   few 
  more 
  than 
  30 
  joints, 
  the 
  longest 
  about 
  

   thrice 
  as 
  long 
  as 
  wide, 
  faintly 
  constricted 
  

   inmiddle, 
  andpubescent. 
  (Pl.III,Fig. 
  3,c.) 
  

  

  Body 
  and 
  legs 
  pubescent, 
  clothed 
  with 
  

   whitish 
  and 
  brown, 
  or 
  black, 
  dentate 
  

   scales 
  or 
  hairs 
  ', 
  general 
  coloration 
  not 
  

   uniform. 
  Crest 
  of 
  prothorax 
  and 
  meso- 
  

   thorax 
  black. 
  A 
  black 
  stripe 
  along 
  the 
  

   middle 
  of 
  the 
  back 
  of 
  the 
  abdomen, 
  often 
  

   interrupted 
  on 
  the 
  second 
  to 
  seventh 
  

   joints, 
  with 
  a 
  whitish 
  patch 
  each 
  side 
  of 
  

   its 
  front 
  end. 
  (PI. 
  Ill, 
  Fig. 
  3, 
  b, 
  d.) 
  

  

  Abdomen 
  tai)ering 
  rather 
  acutely 
  be- 
  

   hind, 
  and 
  with 
  an 
  exsertile, 
  two-jointed, 
  

   conspicuous 
  ovipositor. 
  (PI. 
  — 
  , 
  Fig. 
  9, 
  e.) 
  

  

  Two 
  rows 
  of 
  spines 
  on 
  back 
  of 
  the 
  first 
  

   seven 
  joints 
  more 
  prominent 
  than 
  in 
  the 
  

   male, 
  and 
  often 
  giving 
  the 
  dorsum 
  a 
  red- 
  

   dish 
  aspect. 
  (PI. 
  Ill, 
  Fig. 
  3, 
  d,) 
  

  

  Of 
  a 
  rather 
  smal 
  ler 
  size 
  than 
  j^ometona, 
  

  

  the 
  wings 
  of 
  the 
  male 
  expanding 
  from 
  

  

  0.86-1.30 
  inches, 
  and 
  the 
  fe: 
  

  

  ing 
  0.20-0.35 
  inch 
  in 
  length. 
  

  

  11 
  E 
  

  

  distance 
  from 
  base 
  to 
  apex, 
  where 
  it 
  forms 
  

   a 
  pale, 
  quadrate 
  spot, 
  relieved 
  by 
  a 
  darker 
  

   shading 
  of 
  the 
  wing 
  around 
  it 
  : 
  the 
  bands 
  

   sometimes 
  so 
  obsolete 
  as 
  to 
  leave 
  only 
  

   this 
  pale 
  spot 
  ; 
  but 
  more 
  often 
  relieved 
  on 
  

   the 
  sides 
  toward 
  each 
  other 
  by 
  a 
  dark 
  

   shade, 
  most 
  persistent 
  on 
  the 
  veins. 
  (PI. 
  

   Ill, 
  Fig. 
  7, 
  a.) 
  

   No 
  such 
  band. 
  

  

  Hind-wings 
  with 
  the 
  costal 
  vein 
  bifur- 
  

   cating 
  considerably 
  beyond 
  the 
  discal, 
  

   which 
  is 
  strongly 
  elbowed 
  j 
  vein 
  5 
  quite 
  

   strong. 
  (PI. 
  Ill, 
  Fig. 
  6, 
  &.) 
  

  

  Grayish-brown, 
  with 
  a 
  faint 
  blackish 
  

   discal 
  dot. 
  

  

  In 
  most 
  specimens 
  a 
  curved 
  white 
  band 
  

   runs 
  across 
  the 
  wing, 
  and 
  the 
  veins 
  inside 
  

   this 
  band 
  and 
  on 
  hind 
  border 
  are 
  gen- 
  

   erally 
  dotted. 
  

  

  Under 
  surface 
  with 
  a 
  dusky 
  discal 
  spot 
  

   on 
  each 
  wing, 
  and 
  with 
  the 
  outer 
  pale 
  

   band 
  on 
  upper 
  surface 
  of 
  front- 
  wings 
  as 
  

   well 
  as 
  that 
  of 
  the 
  hind-wings 
  showing 
  

   distinctly, 
  the 
  former 
  relieved 
  by 
  a 
  dusky 
  

   spot 
  inside 
  at 
  costa. 
  

  

  Female 
  — 
  Antennce 
  with 
  over 
  50 
  joints, 
  

   the 
  longest 
  hardly 
  longer 
  than 
  broad; 
  

   uniform 
  in 
  diameter 
  : 
  without 
  pubescence. 
  

   (PI. 
  Ill, 
  Fig. 
  7, 
  c.) 
  

  

  Bod}) 
  and 
  legs 
  smooth, 
  clothed 
  with 
  glis- 
  

   tening 
  brown 
  and 
  white 
  truncate 
  scales 
  

   intermixed, 
  giving 
  it 
  an 
  appearance 
  of 
  

   uniform, 
  shiny, 
  dark 
  ash-gray 
  : 
  somewhat 
  

   paler 
  beneath. 
  (PI. 
  Ill, 
  Fig. 
  7, 
  b. 
  d.) 
  

  

  Abdomen 
  tapering 
  rather 
  bluntly 
  be- 
  

   hind, 
  without 
  exsertile 
  ovipositor. 
  

  

  No 
  spines 
  on 
  abdomen. 
  

  

  The 
  wings 
  of 
  the 
  male 
  expand 
  from 
  

   1.05-1.35 
  inches 
  ; 
  and 
  the 
  female 
  meas- 
  

   ures 
  0.25-0.40 
  inch. 
  

  

  