﻿NO. 
  1965. 
  SYNOPSIS 
  OF 
  AMERICAN 
  MINKS— 
  HOLLISTER. 
  475 
  

  

  MUSTELA 
  VISON 
  LETIFERA, 
  new 
  subspecies. 
  

   1888. 
  Lutreola 
  vison 
  Baxley, 
  Rep. 
  Comm. 
  Agric, 
  1887, 
  p. 
  433. 
  

  

  Tijpe-locality. 
  — 
  Elk 
  River, 
  Minnesota, 
  Type-specimen, 
  No. 
  188305, 
  

   U.S.N.M., 
  male 
  ad., 
  skin 
  and 
  skull; 
  collected 
  November 
  7, 
  1885, 
  by 
  

   V. 
  Bailey. 
  

  

  Geographic 
  distribution. 
  — 
  From 
  northern 
  Wisconsin 
  and 
  northern 
  

   South 
  Dakota 
  south 
  to 
  northern 
  lUinois, 
  northern 
  Missouri, 
  and 
  

   southern 
  Kansas. 
  

  

  Subspecijic 
  characters. 
  — 
  Like 
  Mustela 
  vison 
  lacustris, 
  but 
  averaging 
  

   smaller 
  and 
  paler. 
  Skull 
  smaller, 
  less 
  constricted 
  back 
  of 
  postorbital 
  

   processes 
  and 
  with 
  very 
  much 
  hghter, 
  narrower 
  rostrum. 
  

  

  Measurements. 
  — 
  Total 
  length 
  of 
  type: 
  660 
  (26 
  inches, 
  flesh). 
  

   Skull 
  of 
  type: 
  Condylobasal 
  length, 
  69.6; 
  zygomatic 
  breadth, 
  40.9; 
  

   least 
  postorbital 
  constriction, 
  13; 
  mastoid 
  breadth, 
  35.4; 
  length 
  of 
  

   upper 
  molar-premolar 
  row, 
  17.9 
  mm. 
  Average 
  measurements 
  of 
  five 
  

   skulls 
  of 
  adult 
  males 
  from 
  Elk 
  River 
  and 
  Fort 
  Snelling, 
  Minnesota: 
  

   Condylobasal 
  length, 
  69.3; 
  z5^gomatic 
  breadth, 
  39.8; 
  least 
  postorbital 
  

   constriction, 
  12.8; 
  mastoid 
  breadth, 
  35; 
  length 
  of 
  upper 
  molar- 
  

   premolar 
  row, 
  17.9 
  mm. 
  

  

  Remarlis. 
  — 
  This 
  is 
  a 
  well-marked 
  subspecies 
  occupying 
  a 
  large 
  area 
  

   in 
  the 
  upper 
  Mississippi 
  Valley 
  and 
  thence 
  southwest 
  to 
  Kansas. 
  

   Owdng 
  to 
  the 
  lack 
  of 
  good 
  series 
  of 
  adult 
  specimens 
  from 
  the 
  middle 
  

   Mississippi 
  Valley, 
  the 
  limits 
  of 
  the 
  range 
  of 
  this 
  form 
  to 
  the 
  south- 
  

   east 
  can 
  not 
  now 
  be 
  defined 
  satisfactorily. 
  In 
  general, 
  the 
  fine 
  

   dividing 
  the 
  ranges 
  of 
  letifera 
  and 
  lutreocephala 
  runs 
  from 
  the 
  north- 
  

   western 
  corner 
  of 
  Indiana 
  to 
  the 
  northeast 
  corner 
  of 
  Missouri, 
  thence 
  

   southwest 
  to 
  the 
  southeastern 
  corner 
  of 
  Kansas. 
  Larger 
  series, 
  to 
  

   supplement 
  the 
  scattering 
  material 
  now 
  at 
  hand 
  from 
  tliis 
  general 
  

   region, 
  may 
  materially 
  change 
  our 
  ideas 
  of 
  these 
  limits; 
  but 
  there 
  is 
  

   no 
  trouble 
  in 
  distinguishing 
  the 
  two 
  forms, 
  which, 
  back 
  from 
  the 
  

   general 
  line 
  of 
  intergradation 
  are 
  represented 
  by 
  large 
  scries 
  and 
  are 
  

   well 
  marked. 
  

  

  MUSTELA 
  VISON 
  LACUSTRIS 
  (Preble). 
  

  

  1902. 
  Lutreola 
  vison 
  lacustris 
  Preble, 
  North 
  Amer. 
  Fauna, 
  No. 
  22, 
  p. 
  66, 
  October 
  

   31. 
  

  

  1903. 
  Putorius 
  vison 
  lacustris 
  Miller 
  and 
  Rehn, 
  Proc. 
  Boston 
  Soc. 
  Nat. 
  Hist., 
  

   vol. 
  31, 
  No. 
  3, 
  p. 
  114, 
  August. 
  

  

  1912. 
  Mustela 
  vison 
  lacustris 
  Miller, 
  Bull. 
  U. 
  S. 
  Nat. 
  Mus., 
  No. 
  79, 
  p. 
  101, 
  

   December 
  31. 
  

  

  Type-locality. 
  — 
  Echimamish 
  River 
  (near 
  Painted 
  Stone), 
  Keewatin. 
  

  

  Geographic 
  distribution. 
  — 
  ^^Interior 
  of 
  Canada 
  from 
  Great 
  Bear 
  Lake 
  

   and 
  western 
  -shores 
  of 
  Hudson 
  Bay 
  south 
  through 
  Alberta, 
  Sas- 
  

   katchewan, 
  and 
  Manitoba, 
  to 
  southern 
  North 
  Dakota. 
  

  

  Subspecijic 
  characters. 
  — 
  Nearest 
  related 
  to 
  M. 
  v. 
  ingens, 
  but 
  smaller, 
  

   sUghtly 
  paler, 
  and 
  with 
  maximum 
  amount 
  of 
  white 
  beneath. 
  Differs 
  

   from 
  M. 
  V. 
  letifera 
  in 
  its 
  slightly 
  larger 
  size, 
  darker 
  average 
  color, 
  and 
  

  

  