Part 29

Specimens examined.--Total, 44, distributed as follows:

KANSAS: Brown Co.: Horton, 1. Douglas Co.: Sec. 8, T. 123, R. 20E, 5-1/2 mi. N, 1-3/4 mi. E Lawrence, 10; 5 mi. N and 1-1/2 mi. E Lawrence, 3; Robinson Farm, 5 mi. N and 3 mi. E Lawrence, 2; 4 mi. N, 2-1/2 mi. E Lawrence, 1; Lakeview, 2; 7-1/2 mi. SW Lawrence, 1. Greenwood Co.: 1/2 mi. S Hamilton, 1.

MISSOURI: Cole Co.: Jefferson City, 2 (MO). Jackson Co.: no exact locality, 1 (USBS). Jefferson County: Pevely, 1 (USBS).

NEBRASKA: Blaine Co.: Dismal River, at Thomas-Blaine County line, 1 (NGFP). Boyd Co.: 2 mi. E and 15 mi. S Spencer, 1. Buffalo Co.: Platte Meadows, Kearney, 1 (HM). Butler Co.: 5 mi E Rising City, 1. Cherry Co.: Niobrara River, 18 mi. NW Kennedy, 1; Ballard Marsh, 20 mi. S Valentine, 1 (JKJ); Pony Lake Headquarters, Valentine Nat'l Wildlife Refuge, 1 (JKJ). Colfax Co.: 2 mi. S Schuyler, 1 (JKJ). Cuming County: Beemer, 4 (USBS). Dixon Co.: 3 mi. NE Ponca, 1. Platte County: Columbus, 1 (USBS). Richardson Co.: 5 mi. SE Rulo, 1 (NGFP).

OKLAHOMA: Tulsa Co.: Mohawk Park, 2 (UM).

SOUTH DAKOTA: Bennett Co.: Batesland, 1 (FM).

Marginal records.--South Dakota: Batesland. Nebraska: 3 mi. NE Ponca; Beemer; 5 mi. SE Rulo. Missouri: Pevely. Oklahoma: Mohawk Park. Kansas: 1/2 mi. S Hamilton. Nebraska: Platte Meadows, Kearney; Ballard Marsh, 20 mi. S Valentine; Niobrara River, 18 mi. NW Kennedy.

=Zapus hudsonius preblei= new subspecies

Type.--Male, adult, No. 73085, U. S. Nat. Mus., Biol. Surv. Coll.; Loveland, Larimer County, Colorado; obtained on July 23, 1895, by E. A. Preble, original No. 435.

Range.--Southeastern Wyoming and north-central Colorado. See fig. 47. Zonal range: Transition.

Description.--Size medium; color dull, back from near Clay Color to near Tawny-Olive with admixture of black hair forming poorly defined dorsal band; sides lighter than back from near Clay Color to near Cinnamon-Buff; lateral line distinct and clear Ochraceous-Buff; belly white, sometimes with faint wash of clear Ochraceous-Buff; tail bicolored, brownish to light brownish-black above, grayish-white to yellowish-white below; ears dark, narrowly edged with color of sides; feet grayish-white above; incisive foramina relatively narrow and elongate; auditory bullae moderately inflated; pterygoid fossae relatively broad; postpalatal notch broadly rounded; interorbital region relatively narrow; zygomatic arch not widely bowed; frontal region well inflated; distance from incisors to postpalatal notch relatively short.

Comparisons.--Among named subspecies, Zapus hudsonius preblei most closely resembles Z. h. campestris. From topotypes of Z. h. campestris, Z. h. preblei differs as follows: Upper parts generally dull, averaging lighter, less black-tipped hair; dorsal band less distinct; sides duller; averaging smaller in most cranial measurements taken; least interorbital constriction narrower; auditory bullae smaller, less well inflated; incisive foramina narrower, not truncate posteriorly; frontal region usually more inflated.

From Zapus hudsonius pallidus, Z. h. preblei differs as follows: Upper parts generally duller (less ochraceous); dorsal band less distinct; sides paler (not bright Ochraceous-Buff); zygomatic arch less widely bowed; least interorbital constriction narrower; occipitonasal length averaging greater; distance from incisors to postpalatal notch averaging less; incisive foramina longer, proportionally less widely bowed; auditory bullae longer; pterygoid fossae averaging broader.

Remarks.--No evidence of intergradation with any other geographic race was noted. To the east the range of Z. h. preblei is separated from that of Z. h. pallidus (western Kansas and southwestern Nebraska), by several hundred miles of mixed and short grass prairie. Much of this area is unsuitable to jumping mice but local marshy places might be inhabited. Much territory inhospitable to Zapus intervenes also between the ranges of Z. h. preblei and Z. h. campestris. This area (northern Platte, Goshen, eastern Converse, Niobrara, and southern Weston counties, Wyoming) is chiefly rolling hills and short grass prairie and, like that to the east, is only locally suitable for Zapus. If jumping mice do occur in suitable places in these intervening areas it is to be expected that they will show intergradation between the subspecies concerned.

Zapus hudsonius preblei, on the basis of 11 specimens, agrees most closely in size and color with Z. h. campestris; there is much less resemblance between Z. h. preblei and Z. h. pallidus.

An adult from Springhill, 12 mi. N Laramie Peak, is typically Z. h. preblei as is one from Cheyenne.

Although specimens of Z. h. preblei are few (4 adult, 7 non-adults), the differences between this and neighboring named kinds is considerable.

Specimens examined: Total, 11, distributed as follows:

COLORADO: Boulder County: 3 mi. E Boulder, 1 (UCM); 5 mi. E Boulder, 1 (UCM); south of Boulder (no exact locality), 1 (UCM). Jefferson County: Semper, 1. Larimer County: Loveland, 2 (USBS).

WYOMING: Albany County: Springhill, 12 mi. N Laramie Peak, 6300 ft., 3 (USBS). Laramie County: Cheyenne, 1 (USNM). Platte County: Chugwater, 1 (Clev. MNH).

Marginal records.--Wyoming: Springhill, 12 mi. N Laramie Peak, 6300 ft.; Chugwater; Cheyenne. Colorado: Loveland; Semper.

=Zapus hudsonius tenellus= Merriam

Zapus tenellus Merriam, Proc. Biol. Soc. Washington, 11:103, April 26, 1897.

Zapus hudsonius tenellus, Hall, Univ. California Publ. Zool., 40:377, November 5, 1934.

Zapus hudsonius hudsonius, Baker, Univ. Kansas Publ., Mus. Nat. Hist., 5:111, November 28, 1951 (part--the part from E side Minaker River, 1 mi. W Trutch and 3 mi. N Fort St. John, British Columbia).

Type.--Female, young adult, skin and skull, No. 66932 U. S. Nat. Mus., Biol. Surv. Coll.; Kamloops, British Columbia; obtained on August 25, 1894, by Clark P. Streator, original No. 4196.

Range.--British Columbia. See fig. 47. Zonal range: Canadian and Hudsonian.

Description.--Size medium; back from near Clay Color (brighter) to near Cinnamon-Buff with admixture of black tipped hairs forming a weakly defined dorsal band; sides lighter than back from near dull Ochraceous-Buff to near Cinnamon-Buff frequently with admixture of dark-tipped hairs; lateral line usually distinct, of clear Ochraceous-Buff; belly white sometimes with slight suffusion of Ochraceous-Buff; tail bicolored, brownish to brownish-black above, white or grayish-white to yellowish-white below; ears dark, edged and flecked on inner surface with color of sides; feet grayish-white above; auditory bullae relatively narrow, moderately inflated, elongate when viewed from below, anterior edge slightly concave; incisive foramina relatively short; braincase relatively narrow; vertical depth of skull at junction of frontals and nasals relatively great; nasals relatively narrow; pterygoid fossae moderately broad; zygomata relatively short.