Wisconsin: Burnett County: Danbury, 1 (USBS). Chippewa County: Holcombe, 3 (USBS). Clark County: Withee, 4 (USBS); Worden Township, 2 (USBS). Crawford County: Lynxville, 1 (USBS). Dane Co.: Madison, 2 (OHIO). Dodge Co.: Horicorn Refuge, 2 (USBS). Juneau County: Mather, 1 (USBS). Marathon Co.: Rib Hill, 8 (USBS). Oconto County: Lakewood, 1 (USBS). Portage County: Stevens Point, 3 (USBS). Price County: Ogema, 2 (USBS). Rock County: Milton, 1 (USBS). Sauk County: Devils Lake, 1 (USBS). Sheboygan County: 8 mi. SW Mellen, 1 (USBS); Elkhart Lake, 1 (USBS). Walworth County: Delavan, Fosters Bridge, 1 (USBS); Turtle Lake, 1 (USBS). Wood Co.: Thorp Township, 2 (AMNH); Hewett Township, 4 (AMNH).
Marginal records.—North Dakota: Fish Lake; Pembina. Wisconsin: Danbury; Ogema; Lakewood. Illinois: Fox Lake. Indiana: La Fayette; New Harmony. Illinois: 6 mi. S Pinckneyville (near Pyatt). Iowa: Ames; Arthur; Ireton. Montana: Yellowstone River, 7 mi. NE Glendive, 2000 ft. North Dakota: Grinnell.
Zapus hudsonius ladas Bangs
Zapus hudsonius ladas Bangs, Proc. New England Zool. Club, 1:10, February 28, 1899.
Type.—Female, adult, skin and skull, No. 4169, E. A. and O. Bangs Coll. (now in Mus. Comp. Zool.); Rigoulette, Hamilton Inlet, Labrador; obtained on July 18, 1895, by C. H. Goldthwaite.
Range.—Eastern Quebec north of Gulf of St. Lawrence, Labrador, and Newfoundland. See [fig. 47]. Zonal range: Canadian and Hudsonian.
Description.—Size medium; back relatively dark, near Ochraceous-Tawny with admixture of black-tipped hair; dorsal band relatively wide but not sharply defined against color of sides; side lighter than back, from near Ochraceous-Tawny to near Cinnamon and lined with black-tipped hair; lateral line distinct of clear Cinnamon-Buff or Light Ochraceous-Buff; underparts white, often suffused with Ochraceous-Buff; tail distinctly bicolored, dark brown to black above and yellowish-white to grayish-white below; ears dark, usually flecked with Tawny Ochraceous and edged with ochraceous; feet grayish-white above; [450] incisive foramina relatively short and broad; pterygoid fossae relatively broad; auditory bullae broad and well inflated; mastoid region relatively broad; zygomata relatively short; inferior arm of zygomatic process of maxillary relatively broad.
Comparison.—From Zapus hudsonius acadicus, which Z. h. ladas closely resembles, it differs in: Color darker, dorsal band much less distinct, underparts more frequently suffused with Ochraceous-Buff; auditory bullae relatively broader and more inflated; pterygoid fossae broader; zygomata averaging shorter; incisive foramina relatively shorter; inferior arm of zygomatic process of maxillary relatively broader.
From Zapus hudsonius canadensis, Z. h. ladas differs as follows: Color darker, more richly tawny, dorsal band less distinct; auditory bullae relatively shorter, more inflated; pterygoid fossae averaging broader; zygomata averaging broader; incisive foramina averaging longer.
Remarks.—This subspecies retains all of its diagnostic characters throughout nearly all parts of its geographic range. Specimens from Nova Scotia are like Z. h. ladas in their darker color and less distinct dorsal band, but in the remainder of their characters they are distinct and best referable to Z. h. acadicus.