﻿[133] 
  On 
  some 
  species 
  of 
  Cossus. 
  245 
  

  

  From 
  near 
  the 
  base 
  of 
  a 
  prostrate 
  birch 
  at 
  Center 
  which 
  had 
  

   been 
  extensively 
  mined, 
  I 
  took, 
  in 
  1876, 
  a 
  pupa-case, 
  clearly- 
  

   differing 
  from 
  any 
  known 
  species. 
  Unfortunately 
  the 
  speci- 
  

   men 
  has 
  been 
  mislaid, 
  or 
  I 
  should 
  not 
  hesitate, 
  from 
  the 
  char- 
  

   acters 
  it 
  presented 
  to 
  describe 
  it 
  and 
  give 
  the 
  species 
  a 
  name. 
  

   Other 
  trunks 
  of 
  birch 
  have 
  been 
  observed 
  by 
  me, 
  similarly 
  

   mined, 
  and 
  evidently 
  by 
  the 
  same 
  Cossus. 
  

  

  The 
  species 
  above 
  described 
  as 
  Cossus 
  undosus, 
  may 
  pos- 
  

   sibly 
  be 
  the 
  C. 
  populi 
  of 
  Walker 
  {Cat. 
  Lep. 
  Br. 
  Mus., 
  vii, 
  p. 
  

   1515), 
  from 
  Hudson's 
  Bay, 
  which 
  has 
  not 
  yet 
  been 
  identified. 
  

   The 
  very 
  general 
  terms 
  in 
  which 
  its 
  brief 
  description 
  is 
  given, 
  

   will 
  not 
  admit 
  of 
  its 
  separation 
  from 
  allied 
  forms, 
  and 
  unless 
  

   the 
  type 
  is 
  preserved 
  in 
  the 
  British 
  Museum, 
  and 
  comparison 
  

   be 
  made, 
  it 
  must 
  be 
  handed 
  over 
  to 
  the 
  long 
  list 
  of 
  undeter- 
  

   mined 
  and 
  indeterminable 
  species 
  of 
  Walker. 
  

  

  It 
  cannot 
  be 
  the 
  Cossus 
  nanus 
  of 
  *Strecker, 
  from 
  its 
  non-re- 
  

   semblance 
  to 
  Cossus 
  ligniperdi, 
  which 
  C. 
  nanus 
  is 
  said 
  closely 
  

   to 
  resemble* 
  ; 
  and 
  from 
  its 
  differing 
  markedly 
  from 
  a 
  Colorado 
  

   example 
  of 
  a 
  $ 
  Cossus 
  which 
  I 
  refer 
  to 
  the 
  £ 
  named 
  by 
  Mr. 
  

   Strecker 
  but 
  unfortunately 
  accompanied 
  by 
  the 
  mention 
  of 
  

   only 
  a 
  few 
  specific 
  features. 
  

  

  Cossus 
  plagiatus 
  Walker. 
  

  

  This 
  species, 
  briefly 
  indicated, 
  loc. 
  cit., 
  p. 
  1515 
  (1856), 
  is 
  

   another 
  unknown 
  species. 
  Mr. 
  Grote 
  in 
  his 
  List 
  of 
  the 
  North 
  

   American 
  Platypterices, 
  Attaci, 
  etc., 
  p. 
  8 
  (1874), 
  f 
  refers 
  it 
  as 
  

   a 
  synonym 
  of 
  Mac 
  ACurtrei 
  (Boisd.), 
  Icon. 
  Regne 
  An., 
  pi. 
  85, 
  

   f. 
  2, 
  — 
  marking 
  it, 
  however, 
  as 
  an 
  unrecognized 
  species. 
  It 
  

   does 
  not 
  appear 
  why 
  this 
  reference 
  is 
  made, 
  and 
  we 
  may 
  pre- 
  

   sume 
  that 
  it 
  is 
  based 
  on 
  a 
  citation 
  of 
  Dr. 
  Packard, 
  in 
  his 
  

   Synopsis 
  of 
  the 
  Bombycido3 
  of 
  the 
  United 
  States, 
  % 
  where 
  un- 
  

   der 
  the 
  synonymy 
  of 
  Xyleutes 
  plagiatus, 
  he 
  quotes 
  from 
  the 
  

   Systematic 
  List 
  of 
  Canadian 
  Lepidoptera 
  by 
  W. 
  S. 
  M. 
  D' 
  Ur- 
  

   ban, 
  § 
  the 
  following 
  : 
  

  

  ^Cossus 
  nanus 
  n. 
  sp. 
  — 
  Expands 
  1-J- 
  inches. 
  Has 
  the 
  appearance 
  of 
  a 
  minature 
  

   Cossus 
  ligniperda, 
  is 
  gray, 
  of 
  lighter 
  and 
  darker 
  shades, 
  and 
  reticulated 
  with 
  

   black 
  lines 
  which 
  are 
  most 
  noticeable 
  across 
  the 
  disk 
  and 
  on 
  the 
  terminal 
  part 
  of 
  

   wing. 
  Secondaries 
  uniform 
  grayish. 
  Beneath 
  grayish, 
  faintly 
  reticulated. 
  — 
  Hab. 
  

   Colorado. 
  Proc. 
  Acad. 
  Nat. 
  Sci. 
  Phila., 
  1876. 
  p. 
  151. 
  

  

  f 
  Read 
  before 
  the 
  American 
  Philosophical 
  Society, 
  Nov. 
  20th, 
  1874. 
  

  

  \ 
  Proc. 
  Ent. 
  Soc. 
  Phila., 
  vol. 
  iii, 
  p. 
  390. 
  1864. 
  

  

  §Can. 
  Nat. 
  and 
  Geol., 
  Aug. 
  1860, 
  p. 
  247 
  

  

  