Subspecies and Distribution. N. v. vison Schreber, 1776 — E Canada and NE USA (Allegheny Mts). N. v. aestuarina Grinnell, 1916 — SW USA (California & W Nevada). N. v. aniakensis Burns, 1964 — W Alaska. N. v. energumenos Bangs, 1896 — W Canada and NW USA. N. v. evagor Hall, 1932 — SW Canada (Vancouver I). N. v. evergladensis Hamilton, 1948 — SE USA (SW Florida). N. v. ingens Osgood, 1900 — most of Alaska and NW Canada (N Mackenzie & Yukon). N. v. lacustris Preble, 1902 — C Canada (Keewatin Region, Manitoba & Ontario). N. v...
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