﻿162 
  REPORT 
  UNITED 
  STATES 
  ENTOMOLOGICAL 
  COMMISSION. 
  

  

  We 
  thus 
  have 
  two 
  distinct 
  species 
  of 
  Canker 
  Worms, 
  differing 
  not 
  

   only 
  in 
  habit, 
  but 
  differing 
  so 
  much 
  structurally 
  in 
  all 
  states 
  that 
  they 
  

   may 
  at 
  once 
  be 
  distinguished 
  from 
  each 
  other. 
  In 
  contrast 
  with 
  the 
  

   soft, 
  delicate, 
  ovoid 
  eggs 
  secreted 
  in 
  irregular 
  masses, 
  the 
  10-legged 
  

   larva, 
  and 
  the 
  spined 
  and 
  hairy 
  moths 
  of 
  vernataj 
  we 
  have 
  the 
  tough, 
  

   flower-pot-shaped 
  eggs, 
  laid 
  in 
  exposed, 
  regular 
  masses, 
  the 
  12-legged 
  

   larva, 
  and 
  the 
  spineless, 
  smooth 
  moths 
  of 
  pometaria; 
  and 
  the 
  specific 
  

   structural 
  differences 
  are 
  still 
  apparent 
  when 
  we 
  come 
  to 
  examine 
  the 
  

   genital 
  armature 
  of 
  the 
  males. 
  It 
  is 
  really 
  remarkable 
  that 
  these 
  differ- 
  

   ences 
  remained 
  so 
  long 
  unnoticed, 
  especially 
  in 
  those 
  parts 
  of 
  the 
  coun- 
  

   try 
  where 
  pometaria 
  abounds. 
  _ 
  

  

  The 
  distinctions 
  between 
  these 
  two 
  insects, 
  so 
  long 
  confounded, 
  forci- 
  

   bly 
  illustrate 
  the 
  practical 
  importance 
  of 
  minute 
  discriminations 
  in 
  

   economic 
  entomology. 
  

  

  Fomeiaria 
  agrees 
  with 
  the 
  Euroj^ean 
  species 
  of 
  Anisopteryx 
  in 
  the 
  

   principal 
  pterogostic 
  characters, 
  obsolete 
  tongue, 
  and 
  rudimentary 
  

   palpi 
  ; 
  and 
  is, 
  iudeed, 
  the 
  analogue 
  of 
  the 
  well-known 
  cescularia. 
  

  

  Yet, 
  in 
  the 
  antennal 
  characters 
  of 
  the 
  male, 
  and 
  especially 
  in 
  the 
  basal 
  

  

  hump 
  on 
  each 
  joint, 
  it 
  [pometmHa] 
  agrees 
  more 
  nearly 
  with 
  the 
  typical 
  

  

  species 
  of 
  the 
  genus 
  Hyhernia 
  as 
  characterized 
  by 
  Guen^e 
  [than 
  with 
  

  

  cescularia]. 
  So 
  far 
  as 
  we 
  now 
  know, 
  also, 
  it 
  differs 
  from 
  the 
  European 
  

  

  ^species 
  of 
  Anisopteryx 
  in 
  the 
  more 
  distinct 
  areolet 
  in 
  the 
  front 
  wing. 
  

  

  The 
  genus 
  Paleacrita 
  apj^roaches 
  much 
  nearer 
  Hyhernia^ 
  from 
  which 
  

   it 
  is, 
  however, 
  readily 
  distinguished 
  by 
  the 
  double 
  pair 
  of 
  hair 
  fascicles 
  

   to 
  each 
  ^ 
  antennal 
  joint 
  j 
  the 
  pubescent 
  hairs 
  that 
  cover 
  the 
  female 
  j 
  

   the 
  two-jointed, 
  horny, 
  exsertile 
  ovipositor 
  ; 
  but, 
  more 
  esiDCcially, 
  by 
  

   the 
  dorsal 
  abdominal 
  spines 
  in 
  both 
  sexes 
  — 
  all 
  characters 
  unmentioned 
  

   in 
  existing 
  diagnoses 
  of 
  the 
  genus. 
  

  

  NOMENCLATURE. 
  

  

  From 
  the 
  time 
  when 
  William 
  Dandridge 
  Peck 
  published 
  (in 
  1795) 
  his 
  

   essay 
  on 
  the 
  Canker 
  Worm, 
  which 
  received 
  a 
  prize 
  from 
  the 
  Massachu- 
  

   setts 
  Society 
  for 
  Promoting 
  Agriculture, 
  up 
  to 
  the 
  year 
  1873, 
  all 
  writers 
  

   on 
  the 
  subject 
  spoke 
  of 
  The 
  Canker 
  Worm, 
  under 
  the 
  impression 
  that 
  

   all 
  Canker 
  Worms 
  were 
  of 
  one 
  species. 
  Until 
  that 
  time 
  no 
  other 
  dis- 
  

   tinctive 
  name 
  appears 
  to 
  have 
  been 
  borne 
  by 
  them. 
  In 
  that 
  year 
  Mr. 
  

   Peck 
  described 
  one 
  of 
  the 
  species 
  in 
  such 
  a 
  way 
  that 
  it 
  could 
  be 
  recog- 
  

   nized, 
  and 
  gave 
  to 
  it 
  the 
  name 
  of 
  Phalcena 
  vernata. 
  !No 
  further 
  pro- 
  

   gress 
  in 
  naming 
  the 
  insects 
  was 
  made 
  until 
  1841, 
  when 
  Dr. 
  Thaddeus 
  

   William 
  Harris 
  presented 
  A 
  Eeport 
  on 
  the 
  Insects 
  of 
  Massachusetts, 
  In- 
  

   jurious 
  to 
  Vegetation, 
  to 
  the 
  Commissioners 
  on 
  the 
  Zoological 
  and 
  Bot- 
  

   anical 
  Survey 
  of 
  Massachusetts, 
  which 
  report 
  was 
  published 
  in 
  the 
  same 
  

   year. 
  In 
  this, 
  on 
  page 
  332, 
  speaking 
  of 
  the 
  Oeometrce, 
  he 
  says 
  : 
  

  

  Those 
  kinds, 
  whereof 
  the 
  females 
  are 
  wingless, 
  or 
  have 
  only 
  very 
  short, 
  scale-like 
  

   wings, 
  and 
  naked 
  antennae, 
  Avhile 
  the 
  males 
  have 
  large, 
  entire 
  wings, 
  and 
  feathered 
  

   or 
  downy 
  antennsD, 
  seem 
  to 
  form 
  a 
  distinct 
  group, 
  which 
  may 
  be 
  named 
  Hyhemians 
  

  

  