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  UNITED 
  STATES 
  ENTOMOLOGICAL 
  COMMISSION. 
  

  

  or 
  specific 
  — 
  1st, 
  because 
  the 
  general 
  resemblance 
  is 
  strong 
  ; 
  2d, 
  because 
  

   each 
  species 
  varies 
  considerably 
  both 
  in 
  size 
  and 
  ornamentation 
  ; 
  3d, 
  

   because 
  the 
  wing-scales, 
  especially 
  of 
  one 
  species, 
  easily 
  rub 
  off, 
  and 
  

   perfect 
  specimens, 
  captured 
  at 
  large, 
  are 
  uncommon. 
  

  

  It 
  was 
  not 
  until 
  the 
  year 
  1873 
  that 
  the 
  distinctness 
  of 
  the 
  two 
  species 
  

   was 
  clearly 
  established. 
  More 
  careful 
  comparisons 
  made 
  at 
  that 
  time 
  

   by 
  Mr. 
  B. 
  P. 
  Mann 
  showed 
  essential 
  and 
  very 
  striking 
  differences 
  be- 
  

   tween 
  the 
  two 
  species 
  in 
  both 
  sexes, 
  but 
  the 
  previously 
  universal 
  con- 
  

   fusion 
  regarding 
  the 
  application 
  of 
  the 
  respective 
  scientific 
  names 
  was 
  

   not 
  noticed 
  until 
  Mr. 
  H. 
  K. 
  Morrison, 
  having 
  consulted 
  Professor 
  Peck's 
  

   original 
  paper, 
  with 
  Mr. 
  Mann's 
  discriminations 
  in 
  view, 
  called 
  atten- 
  

   tion 
  to 
  it.^^ 
  As 
  a 
  consequence 
  of 
  this 
  confusion 
  no 
  reliance 
  can 
  be 
  

   placed 
  upon 
  the 
  use 
  of 
  any 
  name 
  previous 
  to 
  1874, 
  as 
  a 
  means 
  of 
  dis- 
  

   criminating 
  between 
  these 
  species. 
  

  

  In 
  his 
  "Monograph 
  of 
  the 
  Geometrid 
  Moths," 
  published 
  in 
  1876 
  under 
  

   the 
  auspices 
  of 
  Dr. 
  Hayden's 
  Geological 
  Survey 
  of 
  the 
  Territories, 
  Dr. 
  

   Packard 
  commits 
  the 
  same 
  error 
  that 
  we 
  had 
  committed 
  in 
  our 
  Sixth 
  

   Missouri 
  Eeport 
  in 
  concluding 
  that 
  Harris's 
  j^ometaria 
  is 
  Peck's 
  vernata^ 
  

   although 
  the 
  misleading 
  nature 
  of 
  Dr. 
  Harris's 
  language 
  regarding 
  the 
  

   two 
  species 
  had 
  been 
  pointed 
  out 
  in 
  the 
  meanwhile. 
  ^^ 
  Under 
  this 
  

   misapprehension 
  he 
  has 
  substituted 
  the 
  name 
  of 
  autumnata 
  for 
  pome- 
  

   taria, 
  though 
  it 
  is 
  evident 
  that 
  the 
  former 
  name 
  cannot 
  obtain, 
  ^° 
  and, 
  

   in 
  fact, 
  in 
  the 
  introduction 
  (pp. 
  8, 
  23, 
  39) 
  to 
  the 
  Monograph 
  the 
  names 
  

   pometaria 
  (not 
  autumnata) 
  and 
  vernata 
  are 
  used. 
  

  

  In 
  his 
  first 
  paper 
  on 
  this 
  subject 
  '^^ 
  Mr. 
  Mann 
  gave 
  reasons 
  for 
  be- 
  

   lieving 
  that 
  vernata 
  J 
  true 
  to 
  its 
  name, 
  is 
  purely 
  vernal 
  in 
  habit, 
  and 
  

   does 
  not 
  issue 
  in 
  the 
  fall, 
  while 
  pometaria 
  issues, 
  for 
  the 
  most 
  part, 
  in 
  

   the 
  fall 
  of 
  the 
  year. 
  In 
  general 
  this 
  seems 
  to 
  be 
  true, 
  although 
  during 
  

   mild 
  winters, 
  in 
  the 
  western 
  and 
  southwestern 
  parts 
  of 
  the 
  country, 
  

   some 
  adult 
  individuals 
  of 
  vernata 
  do 
  appear 
  in 
  the 
  fall 
  of 
  the 
  year 
  in 
  

   which 
  they 
  have 
  attained 
  their 
  growth 
  as 
  larvae. 
  In 
  consequence 
  of 
  

   the 
  general 
  truth 
  of 
  these 
  distinctions, 
  however, 
  we 
  proposed, 
  in 
  1875, 
  

   for 
  Faleacrita 
  vernata 
  the 
  vernacular 
  name 
  of 
  the 
  Spring 
  Canker 
  Worm, 
  

   and 
  for 
  Anisopteryx 
  pometaria 
  that 
  of 
  the 
  Fall 
  Canker 
  Worm, 
  and 
  shall 
  

   presently 
  treat 
  of 
  each 
  separately 
  under 
  these 
  names. 
  

  

  The 
  following 
  synonymy 
  of 
  the 
  combined 
  genera 
  is 
  given 
  by 
  Pack- 
  

   ard 
  : 
  ^2 
  

  

  Erannis 
  Hubn. 
  (in 
  part), 
  Verz., 
  320, 
  1818. 
  

  

  AlsopMla 
  Hiibn. 
  (in 
  part), 
  Verz., 
  320, 
  1818. 
  

  

  Fidonia 
  Treits. 
  (in 
  part), 
  Schm. 
  Eur., 
  vi 
  (i),262, 
  1827. 
  

  

  Hibernia 
  Dujp. 
  (in 
  part), 
  Lep. 
  France, 
  vii 
  (iv), 
  301, 
  1829. 
  

  

  6«Can. 
  Entom., 
  v. 
  6, 
  pp. 
  29-32. 
  

  

  eaPioc. 
  Bost. 
  Soc. 
  Nat. 
  Hist., 
  v. 
  16, 
  p. 
  207; 
  Trans. 
  Acad. 
  Sci. 
  Saint 
  Louis, 
  v. 
  3, 
  p. 
  273. 
  

  

  «« 
  Trans. 
  Acad. 
  Sci. 
  Saint 
  Louis, 
  v. 
  3, 
  p. 
  575. 
  

  

  eiProc. 
  Bost. 
  Soc. 
  Nat. 
  Hist., 
  v. 
  15, 
  pp. 
  381-384. 
  

  

  62 
  Monograph 
  of 
  the 
  Geometrid 
  Moths, 
  pp. 
  398-399. 
  

  

  