﻿476 
  PR0CEEDIN08 
  OF 
  THE 
  NATIONAL 
  MUSEUM. 
  vol.44. 
  

  

  very 
  broad 
  rostrum. 
  Braincase 
  flat, 
  long, 
  and 
  little 
  rounded 
  pos- 
  

   teriorly. 
  

  

  Measurements 
  of 
  sJcuTls. 
  — 
  Average 
  of 
  8 
  skulls 
  of 
  adult 
  males 
  from 
  

   Keewatin: 
  Condylobasal 
  length., 
  71.5; 
  zygomatic 
  breadth, 
  42.3; 
  least 
  

   postorbital 
  constriction, 
  11.9; 
  mastoid 
  breadth, 
  37.2; 
  length 
  of 
  upper 
  

   molar-premolar 
  row, 
  18.4 
  mm. 
  

  

  Remarlcs. 
  — 
  Tliis 
  form, 
  which 
  has 
  an 
  extensive 
  range 
  over 
  the 
  

   interior 
  of 
  Canada, 
  grades 
  into 
  the 
  still 
  larger 
  ingens 
  in 
  the 
  lower 
  

   Mackenzie 
  Valley; 
  and 
  in 
  the 
  northern 
  United 
  States 
  (northern 
  Min- 
  

   nesota 
  and 
  southern 
  North 
  Dakota) 
  blends 
  into 
  the 
  lighter 
  colored 
  

   and 
  slightly 
  less 
  robust 
  letifera. 
  

  

  MUSTELA 
  VISON 
  ENERGUMENOS 
  (Bangs). 
  

  

  1896. 
  Pulorius 
  vison 
  cnergumenos 
  Bangs, 
  Proc. 
  Buslou 
  Soc. 
  Nat. 
  Hist., 
  vol. 
  27, 
  

   p. 
  5, 
  March. 
  

  

  1897. 
  Lutreola 
  vison 
  energumenosMERmAM, 
  Mazama, 
  vol. 
  1, 
  No. 
  2, 
  p. 
  227, 
  October. 
  

   1912. 
  MustcJa 
  vi.son 
  energumenos 
  Miller, 
  Bull. 
  U. 
  S. 
  Nat. 
  Mus., 
  No. 
  79, 
  p. 
  101, 
  

  

  December 
  31. 
  

  

  Type-locality. 
  — 
  Sumas, 
  British 
  Columbia. 
  

  

  Geograpldc 
  distribution. 
  — 
  Western 
  North 
  America, 
  from 
  northern 
  

   British 
  Columbia 
  south 
  to 
  the 
  Sierra 
  Nevada 
  IMountains 
  in 
  California 
  

   and 
  Rocky 
  Mountains 
  in 
  New 
  Mexico. 
  

  

  Suhspecific 
  cliaraders. 
  — 
  Size 
  rather 
  small; 
  coloration 
  dark. 
  Skull 
  

   differs 
  from 
  those 
  of 
  its 
  geographic 
  neighbors, 
  la^custris, 
  nesolestes, 
  and 
  

   letifera, 
  in 
  its 
  smaller 
  size 
  and 
  small 
  teeth. 
  

  

  Measurements 
  of 
  slculls. 
  — 
  Average 
  of 
  5 
  skulls 
  of 
  adult 
  males 
  from 
  

   British 
  Columbia, 
  Washington, 
  Idaho, 
  and 
  Wj^oming: 
  Condylobasal 
  

   length, 
  66.2; 
  zygomatic 
  breadth, 
  38.6; 
  least 
  postorbital 
  constriction, 
  

   13.2; 
  mastoid 
  breadth, 
  33.7; 
  length 
  of 
  upper 
  molar-premolar 
  aeries, 
  

   17.4 
  m"m. 
  

  

  RemarTcs. 
  — 
  Though 
  commonly 
  referred 
  to 
  as 
  a 
  large 
  form, 
  the 
  

   measurements 
  of 
  skulls 
  of 
  adult 
  males 
  of 
  this 
  subspecies 
  (ire 
  exceeded 
  

   by 
  those 
  of 
  all 
  our 
  minks 
  excepting 
  vison 
  and 
  vulgivaga, 
  and 
  good 
  

   series 
  from 
  all 
  parts 
  of 
  the 
  range 
  of 
  energumenos 
  bear 
  this 
  out. 
  Inter- 
  

   gradation 
  is 
  shown 
  by 
  the 
  specimens 
  at 
  hand 
  only 
  in 
  southeastern 
  

   Alaska, 
  with 
  nesolestes; 
  and 
  in 
  the 
  eastern 
  edge 
  of 
  the 
  northern 
  

   Rockies, 
  with 
  lacustris. 
  

  

  MUSTELA 
  VISON 
  NESOLESTES 
  (Heller). 
  

  

  1909. 
  Lutreola 
  vison 
  nesolestes 
  Heller, 
  Univ. 
  California 
  Publ. 
  Zool., 
  vol. 
  5, 
  No. 
  

  

  2, 
  p. 
  259, 
  February 
  18. 
  

   1912. 
  Mustela 
  vison 
  nesolestes 
  Miller, 
  Bull. 
  U. 
  S. 
  Nat. 
  Mus., 
  No. 
  79, 
  p. 
  102, 
  

  

  December 
  31. 
  

  

  Type-locality. 
  — 
  Windfall 
  Harbor, 
  Admiralty 
  Island, 
  Alaska. 
  

   Geographic 
  distributio7i. 
  — 
  Alexander 
  Archipelago, 
  Alaska. 
  

   Suhspecific 
  cliaracters. 
  — 
  Size 
  intermediate 
  between 
  ingens 
  and 
  ener- 
  

   gumenos; 
  colors 
  rather 
  dark. 
  Skull 
  with 
  broadly 
  spreading 
  zygo- 
  

  

  