_Marginal records._--Michigan: Douglas Lake; Bloomfield. New York: E Aurora; Peterboro; Catskills. Connecticut: Sharon; South Woodstock. Massachusetts: Middleboro. New Jersey: Tuckerton. Maryland: Assateague, 5 mi. S Ocean City. North Carolina: Raleigh. Georgia: Athens. Indiana: Mineral Springs. Michigan: 9 mi. N Ludington. =Zapus hudsonius campestris= Preble _Zapus hudsonius campestris_ Preble, N. Amer. Fauna, 15:20, August 8, 1899. _Type._--Male, adult, No. 65872 U. S. Nat. Mus., Biol. Surv. Coll.; Bear Lodge Mt's [Crook County], Wyoming; obtained on June 21, 1894, by B. H. Dutcher, original No. 600. _Range._--Southeastern Montana, southwestern South Dakota, and northeastern Wyoming. See fig. 47. Zonal range: Transition. _Description._--Size large; back from near Ochraceous-Tawny to near Ochraceous-Buff with admixture of black tipped hair forming distinct dorsal band; sides lighter than back, from near Ochraceous-Buff to near Yellow Ocher with black hair interspersed; lateral line usually distinct, of clear Ochraceous-Buff; belly white, usually with moderate suffusion of Ochraceous-Buff; tail bicolored, brownish to brownish-black above, grayish-white to yellowish-white below; ears dark, edged with Ochraceous-Buff; feet grayish-white above; auditory bullae large, well inflated; incisive foramina long and usually truncate at posterior border; pterygoid fossae broad; zygomata relatively wide-spread and long; large medial projection on inferior ramus of zygomatic process of maxillary; condylobasal length and occipitonasal length relatively great; mastoid region and palatal region relatively broad; interparietal bone usually broad. _Comparisons._--From _Zapus hudsonius pallidus_, _Z. h. campestris_ differs as follows: Coloration darker (more black and yellow but less orange); averaging larger in all measurements taken except in least interorbital constriction and distance from incisors to postpalatal notch which are slightly larger and breadth across zygomatic arches which is same; zygomatic arch heavier; incisive foramina larger; interparietal bone broader. Compared with _Zapus hudsonius intermedius_, _Z. h. campestris_ differs as follows: Coloration more tawny and ochraceous, less yellow; auditory bullae averaging larger, more inflated; condylobasal length averaging greater; zygomata averaging more wide-spread and longer; distance from incisors to postpalatal notch averaging longer; mastoid region broader; incisive foramina longer and more truncate posteriorly. From _Zapus hudsonius hudsonius_, _Z. h. campestris_ differs as follows: Size larger; color lighter, more ochraceous, less tawny; occipitonasal length averaging greater; mastoid region broader; zygomata averaging longer; zygomatic arch more widely bowed; distance from incisors to postpalatal notch averaging longer; incisive foramina longer; auditory bullae broader, more inflated. For comparison with _Zapus hudsonius preblei_ see account of that subspecies.