_Marginal records._--Quebec: Ste. Anne des Monts. New Brunswick: Dalhousie. Prince Edward Island. Nova Scotia: Black River District; Doctors Cove, N Barrington Passage. Maine: Columbia Falls; Small Point Beach. Massachusetts: Wilmington; 2 mi. N Gilbertville. New York: Berlin; North Wood; Keene Valley. Maine: E branch Penobscot River. New Brunswick: Baker Lake. =Zapus hudsonius alascensis= Merriam _Zapus hudsonius alascensis_ Merriam, Proc. Biol. Soc. Washington, 2:223, July 15, 1897. _Zapus hudsonius hudsonius_, Osgood, N. Amer. Fauna, 24:37, November 23, 1904. _Type._--Male, adult, skin and skull, No. 73584, U. S. Nat. Mus., Biol. Surv. Coll.; Yakutat Bay, Alaska; obtained on July 5, 1895, by Clark P. Streator, original No. 4660. _Range._--Alaska Peninsula, coastal section of mainland of southern and southeastern Alaska including Revillagigedo Island; also southwestern Yukon. See fig. 47. Zonal range: Canadian and Hudsonian. _Description._--Size large; back from near Ochraceous-Tawny to near Dresden Brown, sometimes darkened with black tipped hair usually with darker mid-dorsal area forming a band; sides lighter than back and from near Ochraceous-Tawny to near Clay Color; lateral line usually distinct, of clear Ochraceous-Buff; belly white, frequently with a slight suffusion of Ochraceous-Buff; tail bicolored, brownish to brownish-black above, white to yellowish-white below; ears dark, edged and flecked on the inner surface with color of sides; feet grayish-white above; auditory bullae broad and moderately inflated; pterygoid fossae relatively broad; incisive foramina relatively long, zygomata relatively long and broadly bowed; mastoid region relatively broad; distance from incisors to postpalatal notch relatively great; occipitonasal length relatively great. _Comparisons._--From _Zapus hudsonius tenellus_, _Z. h. alascensis_ differs as follows: Size larger; upper parts darker, less ochraceous; sides duller, less ochraceous more tawny; incisive foramina averaging longer; mastoid region broader; occipitonasal length greater; zygomata wider-spreading and longer; condylobasal length averaging greater; auditory bullae less broadly rounded; and distance from incisors to postpalatal notch averaging greater. For comparison with _Zapus hudsonius hudsonius_ see account of that subspecies.