North American Jumping Mice (Genus Zapus) - Philip H. Krutzsch

Remarks.—Merriam (1897a:103) named this jumping mouse as a full species, mentioning that the skull is similar in size and characters to that of Zapus hudsonius but that externally these animals differed in coloration and length of the tail. Hall (1934:377) treated Z. tenellus as a subspecies of Z. hudsonius. He observed that the difference between Z. tenellus, Z. h. alascensis, and Z. h. hudsonius was of the same degree, and, even though intergrading material was not known to him, he considered tenellus only subspecifically distinct from Z. hudsonius. Hall (loc. cit.) tentatively referred to Z. h. tenellus specimens from Indianpoint Lake, 15 mi. NE Barkerville, Cottonwood P. O., and Hazelton, British Columbia. I have seen and compared with the type of Z. tenellus all specimens examined by Hall and agree with him that they are best referred to Z. h. tenellus. Since 1934, several additional localities in British Columbia have yielded specimens. Those from Minaker River and Fort St. John are intermediate in dorsal coloration and in size and shape of the auditory bullae between Zapus hudsonius hudsonius and Z. h. tenellus but in all other characters are most nearly like Z. h. tenellus to which they are here assigned. These intergrades constitute additional evidence that Z. tenellus and Z. hudsonius are only subspecies of a single species.

Specimens examined.—Total, 17, all from British Columbia, distributed as follows: east side Minaker River, 1 mi. W Trutch, 1; Hazelton, 959 ft., 2 (MVZ); 5 mi. W and 3 mi. N Fort St. John, 1; Indianpoint Lake, 15 mi. NE Barkerville, 5 (MVZ); Cottonwood P. O., 3 (MVZ); S end Swan Lake, Vernon, 1200 ft., 2 (MVZ); Kamloops, 3 (USBS).

Marginal records.—British Columbia.—E side Minaker River, 1 mi. W Trutch; 5 mi. W and 3 mi. N Fort St. John; S end Swan Lake, Vernon, 1200 ft.; Kamloops; Hazelton, 959 ft.

Table 5.—Cranial Measurements (in Millimeters) of Zapus.

Number examined, ♂♂ plus ♀♀	Breadth of braincase	Condylobasal length	Interorbital breadth	Mastoidal breadth	Length of maxillary tooth-row	Occipitonasal length	Palatal length	Zygomatic breadth	Zygomatic length
	Zapus trinotatus eureka, Big Lagoon, California.
13 mean	10.3	21.4	4.2	10.9	3.9	24.5	10.4	12.5	9.5
max	10.6	22.1	4.4	11.1	4.0	25.5	11.5	13.2	10.0
min	10.0	20.7	3.9	10.0	3.7	24.0	10.5	12.1	9.0
	Zapus trinotatus montanus, Crater Lake, Oregon.
10 mean	10.3	20.7	4.5	10.6	4.0	24.3	10.5	12.1	9.5
max	10.5	21.5	4.7	11.1	4.1	24.8	10.8	12.6	9.8
min	10.2	20.3	4.2	10.2	3.7	23.5	10.1	11.8	9.0
	Lost Cr. R. S., 10 mi. SE McKenzie Bridge, Oregon.
5 mean	10.3	20.9	4.5	10.7	3.9	24.2	10.4	12.1	9.0
max	10.5	21.3	4.6	10.9	4.1	24.6	10.7	12.2	9.0
min	10.2	20.4	4.4	10.5	3.8	23.5	10.0	12.0	9.1
	Zapus trinotatus orarius, 3 mi. W Inverness, 800 ft., California.
12 mean	9.9	20.4	3.8	10.8	3.7	22.6	10.0	12.1	9.3
max	10.2	20.9	4.1	11.0	3.8	23.5	10.6	12.5	9.8
min	9.6	19.9	3.7	10.4	3.6	21.7	9.8	11.9	8.5
	Zapus trinotatus trinotatus, Old Fort Clatsop, 100 ft., Oregon.
8 mean	10.3	21.1	4.4	10.7	3.8	24.3	10.6	12.3	9.0
max	10.6	21.8	4.8	11.0	3.9	25.0	11.0	12.7	10.0
min	10.0	20.2	4.0	10.4	3.7	23.6	10.0	11.9	9.2
	Cayuse Meadow, 3800 ft., 3¹/₂ mi. SW Steamboat Mt’n, Wash.
10 mean	10.4	21.5	4.5	11.1	3.9	24.6	10.7	12.6	9.7
max	10.6	22.2	4.8	11.4	4.1	25.4	11.1	12.8	10.0
min	10.2	20.6	3.8	10.8	3.8	23.7	10.2	12.2	9.3
	Snoqualmie Pass, Washington.
5 mean	10.6	21.6	4.6	11.1	4.0	24.8	10.9	12.8	9.0
max	10.7	22.2	4.8	11.5	4.2	25.6	11.2	13.2	10.0
min	10.4	21.2	4.4	10.9	3.8	24.0	10.5	12.5	9.5
	Alta Lake, 2200 ft., British Columbia.
5 mean	10.6	21.6	4.3	11.3	4.1	24.7	10.8	12.7	9.0
max	10.9	21.9	4.6	11.5	4.3	25.0	10.9	13.1	9.0
min	10.5	21.2	4.2	11.0	3.9	24.4	10.7	12.3	9.6
	Zapus princeps cinereus, Raft River Mt’s, Utah.
4 mean	10.5	21.5	5.0	11.1	4.1	24.5	10.9	12.6	9.0
max	11.0	22.5	5.1	11.4	4.3	25.0	11.6	12.9	10.0
min	10.3	21.0	4.6	10.7	3.9	24.0	10.4	12.3	9.4
	Mt. Harrison, 10 mi. S Albion, Idaho.
13 mean	10.5	21.4	4.8	10.9	4.1	24.9	10.9	12.4	10.1
max	10.7	22.0	5.1	11.4	4.2	25.5	11.4	12.8	10.8
min	10.2	20.9	4.5	10.5	3.9	24.3	10.2	11.7	9.8
	Zapus princeps curtatus, Pine Forest Mt’s, Nevada.
11 mean	10.5	21.1	4.7	10.7	4.2	24.6	10.9	12.2	9.7
max	10.6	21.8	5.0	11.0	4.4	25.3	11.4	12.5	10.0
min	10.2	20.5	4.2	10.5	3.9	24.0	10.5	11.9	9.4
	Zapus princeps idahoensis, several localities near Cody, Wyoming.
24 mean	10.5	21.4	4.6	11.0	4.0	24.7	10.9	12.6	9.6
max	11.2	22.6	5.2	11.4	4.2	25.6	11.5	13.3	10.2
min	9.9	20.6	4.3	10.5	3.9	24.1	10.2	12.0	9.3
	5 mi. E Warm Lake, 7000 ft., Idaho.
4 mean	10.2	21.2	4.3	11.0	4.1	24.4	10.7	12.3	9.0
max	10.3	21.8	4.4	11.1	4.2	24.8	11.0	12.6	9.0
min	10.0	20.7	4.2	10.8	4.0	23.9	10.3	12.0	9.1
	Summit Smith Mt’n, 7500 ft., Idaho.
9 mean	10.2	21.3	4.4	10.9	4.1	24.5	10.7	12.1	9.0
max	10.5	22.5	4.6	11.3	4.3	25.2	11.2	12.6	10.0
min	10.0	20.8	4.0	10.5	3.9	23.9	10.3	11.8	9.1
	2 mi. NE Cooke, 8500 ft., Montana.
6 mean	10.4	21.1	4.4	10.9	4.0	24.3	10.5	12.5	9.0
max	10.6	21.8	4.5	11.5	4.1	25.4	11.1	12.9	10.0
min	10.2	20.3	4.3	10.7	3.8	23.5	9.9	12.0	9.0
	Birch Cr., 18 mi. NE Dillon, 7100 ft., Montana.
11 mean	10.3	21.3	4.3	11.0	4.0	24.5	10.8	12.6	9.6
max	10.6	22.2	4.6	11.6	4.3	25.5	11.5	13.0	9.9
min	9.7	20.7	4.0	10.6	3.8	23.7	10.3	12.4	9.2
	Zapus princeps idahoensis, Waterton Lakes Park, Alberta.
5 mean	10.6	21.4	4.6	10.7	4.1	24.5	10.8	12.2	9.0
max	10.9	22.1	4.7	11.0	4.2	25.2	11.0	12.3	10.0
min	10.3	21.0	4.4	10.4	4.0	24.2	10.6	11.8	9.3
	Zapus princeps kootenayensis, near Rossland, British Columbia.
10 mean	10.2	20.5	4.4	10.6	4.0	23.7	10.4	11.9	9.2
max	10.8	21.0	4.8	10.9	4.2	24.4	10.7	12.2	9.5
min	9.7	20.0	4.1	10.0	3.8	23.2	9.9	11.4	9.0
	Zapus princeps luteus, White Mt’s, Arizona.
20 mean	10.1	20.3	4.9	10.7	3.9	23.8	10.4	11.9	9.7
max	10.4	21.1	5.1	11.2	4.0	24.8	10.9	12.6	10.2
min	9.6	19.1	4.3	10.2	3.6	22.5	9.5	11.1	8.9
	Espanola, 5000 ft., New Mexico.
3 mean	9.8	19.8	4.7	10.5	3.7	23.4	9.9	11.5	9.0
max	10.0	20.1	4.8	10.6	3.8	23.7	10.3	11.6	9.0
min	9.7	19.5	4.5	10.3	3.6	22.9	9.6	11.4	9.4
	Zapus princeps minor, 2 mi. W Fort Totten, 1400 ft., No. Dakota.
11 mean	9.9	20.5	4.5	10.6	3.7	23.7	10.5	11.8	9.6
max	10.1	20.8	4.8	10.8	3.8	24.2	10.7	12.1	9.9
min	9.7	20.0	4.4	10.4	3.6	23.4	10.2	11.4	9.3
	Near Bottineau, North Dakota.
4 mean	10.1	20.9	4.6	10.6	3.8	24.1	10.8	12.3	10.0
max	10.2	21.3	4.7	10.9	3.8	24.5	10.9	12.5	10.0
min	10.1	20.6	4.5	10.4	3.7	23.8	10.7	12.1	9.9
	Head Eagle Cr., Bear Paw Mt’s, Montana.
7 mean	10.0	20.8	4.6	10.7	3.8	24.2	10.7	12.1	9.0
max	10.5	21.3	4.7	10.9	4.0	24.7	11.1	12.5	10.0
min	9.8	20.3	4.4	10.5	3.6	23.2	10.3	11.9	9.7
	N Maple Cr., Cypress Hills, Saskatchewan.
10 mean	10.1	21.2	4.6	10.7	3.9	24.5	10.9	12.3	9.8
max	10.4	21.7	4.9	10.8	4.0	24.8	11.3	12.7	10.0
min	9.9	20.4	4.4	10.5	3.6	24.0	10.5	11.8	9.6
	Zapus princeps oregonus, Parker Cr., Warner Mt’s, 5500 ft., Cal.
12 mean	10.6	21.6	4.7	11.1	4.2	25.0	11.1	12.6	10.2
max	11.0	22.2	4.9	11.6	4.4	25.7	11.4	13.0	10.9
min	10.2	21.2	4.3	10.8	4.0	24.5	10.7	12.4	9.9
	Cobb Cr., 6 mi. SW Mt’n City, Nevada.
12 mean	10.7	21.6	5.0	11.2	4.1	25.0	11.2	12.6	10.0
max	11.1	22.1	5.2	11.4	4.3	25.7	11.8	13.0	10.3
min	10.5	21.0	4.6	10.7	3.8	24.4	10.9	12.2	9.5
	Wisconsin Cr., 8000 ft., Nevada.
10 mean	10.6	21.6	4.9	11.2	4.0	24.8	11.1	12.4	9.5
max	10.8	22.2	5.0	11.5	4.2	25.2	11.4	12.8	9.6
min	10.3	21.2	4.6	10.8	3.9	24.1	10.6	12.2	9.3
	North Fork Malheur River, 21 mi. SE Prairie City, 5000 ft., Ore.
10 mean	10.6	21.5	4.7	11.3	4.2	24.8	11.0	12.7	9.9
max	11.2	22.3	5.2	11.6	4.4	26.2	11.7	13.2	10.9
min	10.0	20.8	4.3	10.9	4.0	23.5	10.5	12.4	9.7
	Zapus princeps pacificus, North Fork Coffee Cr., 4500 ft., Calif.
8 mean	10.4	21.5	4.7	10.9	3.9	24.8	11.1	12.5	10.0
max	10.8	22.4	5.0	11.4	4.0	25.2	11.4	13.2	10.0
min	10.0	20.7	4.5	10.7	3.8	24.0	10.5	12.0	9.6
	Jackson Lake, 5900 ft., California.
7 mean	10.4	21.5	4.5	11.1	4.0	24.9	11.0	12.6	10.0
max	10.6	22.1	4.6	11.5	4.1	25.5	11.4	12.9	10.0
min	10.1	20.7	4.3	10.5	3.8	23.5	10.0	12.2	9.6
	Head of Lyle Canyon, 9700 ft., California.
7 mean	10.3	20.8	4.7	10.6	3.8	24.0	10.5	12.3	9.0
max	10.5	21.8	5.0	11.0	4.0	24.6	10.8	12.7	10.0
min	10.0	20.0	4.5	10.2	3.5	23.0	10.0	11.8	9.0
	Zapus princeps princeps, Florida, Colorado.
7 mean	10.2	21.4	4.6	10.5	3.7	24.9	11.1	12.3	9.0
max	10.5	22.3	4.7	11.3	3.8	25.4	11.4	12.5	10.0
min	9.7	20.7	4.3	9.8	3.5	23.9	10.9	11.9	9.3
	Zapus princeps princeps, Half Way, Colorado.
6 mean	10.1	21.7	4.6	10.8	3.9	24.9	11.0	12.3	9.0
max	10.3	22.0	4.8	11.1	4.0	25.8	11.3	12.7	10.0
min	10.0	21.2	4.5	10.5	3.8	24.2	10.7	12.1	9.6
	8 mi. N, 19¹/₂ mi. E Savery, Wyoming.
11 mean	10.2	21.2	4.5	10.9	3.9	24.5	10.8	12.2	9.7
max	10.5	21.8	4.7	11.1	4.1	25.0	11.1	12.5	10.2
min	10.0	20.8	4.2	10.6	3.7	23.7	10.5	12.0	9.3
	21¹/₂ mi. S, 24¹/₂ mi. W Douglas, 7600 ft., Wyoming.
11 mean	10.1	21.2	4.6	10.9	4.0	24.6	10.8	12.3	9.8
max	10.4	21.9	4.9	11.2	4.1	25.0	11.2	12.8	10.1
min	9.9	20.7	4.5	10.8	3.8	24.2	10.5	12.0	9.5
	Medicine Wheel Ranch, 28 mi. E Lovell, 9000 ft., Wyoming.
20 mean	10.3	21.5	4.7	11.2	4.0	24.7	11.0	12.6	10.0
max	10.6	22.2	4.9	11.5	4.2	25.3	11.4	12.9	10.4
min	10.0	20.7	4.4	10.8	3.8	24.1	10.6	12.2	9.8
	Zapus princeps saltator, Stikine River at Glenora, British Columbia.
17 mean	10.4	21.3	4.4	10.9	4.1	24.3	10.7	12.5	9.6
max	10.7	22.2	4.5	11.4	4.5	25.0	11.4	13.0	10.0
min	9.8	20.5	4.1	10.6	3.8	23.3	10.3	12.0	9.3
	Hazelton, 959 ft., British Columbia.
15 mean	10.4	21.6	4.5	11.0	4.0	24.6	10.9	12.5	9.8
max	10.8	22.3	4.7	11.6	4.2	25.5	11.4	12.9	10.0
min	9.9	20.7	4.2	10.7	3.8	23.7	10.5	11.7	9.4
	Zapus princeps utahensis, near Robertson, 8700 ft., Wyoming.
15 mean	10.7	22.0	5.0	11.2	4.1	25.4	11.1	13.2	9.9
max	11.1	22.6	5.1	11.6	4.2	26.4	11.7	14.0	10.3
min	10.3	21.0	4.7	10.8	3.9	24.6	10.8	12.4	9.6
	3 mi. N and 11 mi. E Alpine, 5650 ft., Wyoming.
17 mean	10.6	22.1	4.7	11.3	4.1	25.3	11.3	13.0	9.9
max	11.0	23.0	4.9	11.7	4.3	26.2	11.8	13.5	10.5
min	10.3	21.3	4.4 1	0.8	4.0	24.2	10.7	12.1	9.5
	Zapus princeps utahensis, Salamander Lake and Lambs Canyon, 9000 ft., Utah.
9 mean	10.9	22.0	4.8	11.2	4.1	25.2	11.1	13.1	10.0
max	11.3	22.4	5.0	11.3	4.3	25.9	11.4	13.3	10.0
min	10.7	21.5	4.5	11.0	3.9	24.6	10.7	12.6	9.7
	Zapus hudsonius acadicus, vicinity of St. Andrews, New Brunswick.
4 mean	9.6	19.8	4.1	10.2	3.5	23.0	10.1	10.8	9.0
max	9.8	19.9	4.2	10.3	3.7	23.1	10.2	11.1	9.0
min	9.2	19.7	3.9	10.0	3.3	22.8	9.9	10.4	9.2
	Sebec Lake, Maine.
3 mean	9.6	19.5	4.3	10.0	3.5	23.0	10.0	10.7	9.0
max	9.8	19.8	4.5	10.1	3.6	23.3	10.1	11.3	9.0
min	9.4	19.0	4.0	9.7	3.4	22.6	9.9	9.9	9.0
	2 mi. S Center Ossipee, New Hampshire.
10 mean	9.6	19.8	4.2	10.1	3.5	23.3	10.0	10.8	9.3
max	10.0	20.5	4.6	10.4	3.6	24.0	10.3	11.0	9.9
min	9.2	18.9	3.8	9.7	3.2	22.3	9.6	10.6	8.8
	Berlin, New York.
6 mean	9.5	19.5	4.3	10.1	3.5	22.9	9.8	10.8	9.0
max	9.9	20.6	4.4	10.6	3.7	23.8	10.6	11.3	9.0
min	9.2	18.8	4.2	9.5	3.4	21.8	9.3	10.4	8.6
	Lake Kedgemakooge, Nova Scotia.
5 mean	9.5	19.9	4.2	10.3	3.5	23.4	10.2	11.3	9.0
max	9.7	20.1	4.3	10.4	3.5	23.5	10.4	11.4	9.0
min	9.3	19.7	4.0	10.3	3.4	23.3	9.9	11.0	9.3
	Zapus hudsonius alascensis, Lake Clark, Alaska.
2 mean	9.5	19.3	4.3	10.0	3.6	22.8	9.9	10.7	9.0
max	9.6	19.6	4.4	10.0	3.6	23.0	9.9	10.7	9.0
min	9.4	19.1	4.2	9.9	3.5	22.6	9.9	10.7	9.2
	Frosty Peak, Yakutat Bay, Alaska.
3 mean	9.8	19.7	4.2	10.3	3.6	23.5	10.1	10.8	9.0
max	10.0	20.0	4.5	10.6	3.7	24.2	10.4	11.1	9.0
min	9.6	19.0	4.0	9.8	3.5	22.5	9.6	10.2	9.2
	Zapus hudsonius alascensis, 7 mi. SSE Haines, 10 ft., Alaska.
14 mean	9.9	20.0	4.2	10.4	3.6	23.7	10.2	11.0	9.4
max	10.1	20.5	4.4	10.8	3.7	24.6	10.7	11.4	9.8
min	9.8	19.5	4.0	10.2	3.4	23.0	9.8	10.4	9.0
	SW end Dezadeash Lake, Yukon.
2 mean	10.0	19.8	4.5	10.5	3.6	23.5	10.2	11.3	9.0
max	10.1	20.1	4.5	10.5	3.6	23.8	10.4	11.3	9.0
min	9.8	19.5	4.4	10.5	3.5	23.2	10.0	11.2	9.5
	Zapus hudsonius americanus, Boyne Falls, Michigan.
8 mean	9.5	18.7	4.1	9.7	3.3	22.0	9.5	11.0	9.0
max	9.8	19.4	4.3	10.0	3.4	23.2	10.0	11.4	9.0
min	9.3	18.3	3.8	9.4	3.0	21.5	9.0	10.3	9.0
	Ann Arbor, Michigan.
3 mean	9.5	18.6	4.2	9.9	3.3	22.0	9.5	10.9	9.0
max	9.6	18.8	4.4	10.0	3.3	22.4	9.8	11.0	9.0
min	9.4	18.5	3.8	9.8	3.2	21.9	9.3	10.8	8.9
	Montauk Point, L. I., New York.
2 mean	9.4	18.8	4.3	9.2	3.5	22.2	9.7	10.6	8.0
max	9.6	19.1	4.4	9.2	3.5	22.5	9.8	10.7	8.0
min	9.2	18.4	4.2	9.2	3.4	21.9	9.5	10.5	8.9
	Mays Landing, New Jersey.
2 mean	9.4	18.8	4.4	9.8	3.4	22.1	9.6	10.9	8.0
max	9.5	18.8	4.4	9.8	3.5	22.2	9.7	11.0	8.0
min	9.3	18.7	4.4	9.8	3.2	22.0	9.5	10.8	8.2
	Laurel, Maryland.
3 mean	9.1	18.6	4.3	9.6	3.3	22.0	9.5	10.6	8.0
max	9.3	18.9	4.5	9.7	3.3	22.0	9.7	10.8	8.0
min	8.9	18.2	4.1	9.5	3.3	21.9	9.2	10.4	8.6
	Hampton, Virginia.
3 mean	9.0	18.8	4.1	9.7	3.3	21.9	9.4	10.6	9.0
max	9.3	18.9	4.1	9.8	3.3	22.0	9.6	11.1	9.0
min	8.6	18.5	4.0	9.6	3.2	21.8	9.2	10.0	8.9
	Zapus hudsonius americanus, Raleigh, North Carolina.
3 mean	9.2	18.8	4.0	9.9	3.4	22.4	9.6	10.9	8.0
max	9.6	19.7	4.2	10.4	3.5	23.0	9.9	10.9	9.0
min	8.8	17.9	3.9	9.4	3.2	21.8	9.4	10.8	8.5
	Zapus hudsonius campestris, 3 mi. NW Sundance, 5900 ft., Wyo.
19 mean	9.7	19.9	4.3	10.4	3.6	23.2	10.0	11.1	9.5
max	10.0	20.8	4.5	10.9	3.8	24.2	10.5	11.8	10.0
min	9.4	19.2	3.8	10.1	3.4	22.4	9.5	10.7	9.2
	Palmer Gulch, Black Hills, South Dakota.
11 mean	9.8	20.2	4.3	10.5	3.7	23.4	10.1	11.4	9.6
max	10.2	21.4	4.5	11.1	3.9	24.9	10.9	12.0	10.2
min	9.5	19.0	4.2	10.1	3.5	21.9	9.5	10.7	9.0
	Zapus hudsonius canadensis, St. Methode, Quebec.
4 mean	9.6	19.2	4.3	10.1	3.6	22.6	9.8	10.9	9.0
max	9.9	19.7	4.5	10.2	3.7	23.5	10.1	11.2	9.0
min	9.1	18.5	3.9	9.9	3.3	21.7	9.5	10.7	8.7
	Pancake Bay, Algoma District, Ontario.
11 mean	9.6	18.8	4.1	10.0	3.5	22.2	9.6	10.4	9.2
max	10.0	19.4	4.4	10.3	3.6	22.8	9.7	10.6	9.7
min	9.2	18.3	3.8	9.6	3.3	21.8	9.2	9.8	8.6
	Franz, Ontario.
5 mean	9.8	19.4	4.2	10.3	3.5	22.6	9.8	10.7	9.0
max	10.0	19.8	4.3	10.5	3.6	23.2	10.2	11.1	9.0
min	9.6	18.9	4.1	10.2	3.4	22.1	9.6	10.4	8.8
	Zapus hudsonius hudsonius, Fort Severn, Ontario.
4 mean	9.9	19.3	4.2	9.9	3.5	22.7	9.6	10.9	9.0
max	10.1	19.7	4.3	10.1	3.6	23.3	9.8	11.0	9.0
min	9.8	19.0	4.0	9.7	3.4	22.0	9.3	10.7	9.0
	Oxford House, Manitoba.
6 mean	9.6	19.1	4.4	9.9	3.5	22.3	9.7	10.4	9.0
max	9.9	19.8	4.6	10.1	3.7	23.1	10.0	10.8	9.0
min	9.3	18.7	4.2	9.6	3.3	21.7	9.5	9.8	8.8
	Zapus hudsonius hudsonius, Emma Lake, Saskatchewan.
2 mean	9.8	19.4	4.3	9.9	3.6	22.7	9.8	10.9	9.0
max	9.8	19.5	4.3	9.9	3.6	22.9	9.9	10.9	9.0
min	9.8	19.3	4.2	9.9	3.5	22.4	9.6	10.9	8.9
	Lac la Nonne, Alberta.
4 mean	9.8	19.1	4.2	10.0	3.4	22.4	9.7	10.5	9.0
max	9.8	19.4	4.2	10.0	3.5	22.6	9.9	10.5	9.0
min	9.7	18.8	4.1	9.9	3.3	22.2	9.6	10.5	8.9
	1 mi. NW Junct. Irons Cr. and Laird River, British Columbia.
3 mean	9.6	19.0	4.3	9.9	3.5	22.2	9.7	10.6	9.0
max	9.6	19.3	4.3	10.1	3.5	22.6	9.8	10.9	9.0
min	9.5	18.7	4.3	9.7	3.4	21.7	9.5	10.3	8.9
	Zapus hudsonius intermedius, Blackner, North Dakota.
2 mean	10.1	19.6	4.3	10.0	3.6	22.7	9.9	11.1	9.0
max	10.1	20.0	4.4	10.4	3.7	23.2	9.9	11.4	9.0
min	10.0	19.1	4.1	9.8	3.4	22.2	9.8	10.8	9.0
	Cannon Ball, North Dakota.
2 mean	9.8	19.1	4.4	10.1	3.6	22.0	9.5	11.0	9.0
max	9.9	19.1	4.4	10.2	3.7	22.4	9.8	11.3	9.0
min	9.6	19.0	4.3	9.9	3.4	21.8	9.2	10.7	9.0
	Elk River, Minnesota.
8 mean	9.5	19.2	4.2	9.9	3.4	22.5	9.6	10.6	9.0
max	9.7	19.6	4.3	10.0	3.6	23.0	9.9	11.0	9.0
min	9.2	18.9	4.0	9.9	3.3	22.1	9.4	10.2	9.0
	E Okeboji Lake, Iowa.
3 mean	9.6	19.3	4.2	9.9	3.4	22.2	9.3	10.2	9.0
max	9.8	19.3	4.2	10.0	3.4	22.2	9.3	10.2	9.0
min	9.4	19.3	4.2	9.8	3.4	22.2	9.2	10.2	9.0
	Turkey Run State Park, Indiana.
2 mean	9.5	18.9	4.2	9.6	3.5	22.3	9.8	10.4	9.0
max	9.6	18.9	4.4	9.6	3.6	22.4	9.8	10.8	9.0
min	9.4	18.9	4.0	9.6	3.3	22.2	9.8	10.0	9.0
	Zapus hudsonius intermedius, Jordan Cr., 3 mi. NE Fairmont, Ill.
5 mean	9.6	19.4	4.1	10.1	3.6	22.6	10.0	10.7	9.2
max	9.9	19.8	4.2	10.3	3.8	23.4	10.5	11.6	9.6
min	9.3	18.9	4.0	10.0	3.4	21.9	9.5	10.3	8.9
	Rib Hill, Wisconsin.
5 mean	9.6	19.0	4.3	10.1	3.4	22.6	9.7	10.8	9.0
max	10.0	19.8	4.4	10.5	3.6	23.7	10.2	11.2	9.3
min	9.4	18.4	4.1	9.7	3.2	21.9	9.4	10.3	8.7
	Lake St. Germain, Wisconsin.
5 mean	9.7	18.9	4.1	10.1	3.5	22.5	9.6	10.5	9.0
max	9.9	19.5	4.3	10.2	3.6	23.2	10.0	10.8	9.3
min	9.5	18.4	3.9	9.8	3.3	21.8	9.0	10.2	8.5
	Zapus hudsonius ladas, Northwest River, Labrador.
6 mean	9.5	19.0	4.2	10.2	3.6	22.4	9.7	10.9	9.0
max	9.6	20.0	4.4	10.3	3.6	23.2	10.2	11.0	9.4
min	9.3	18.4	4.0	10.0	3.5	21.5	9.4	10.6	8.8
	Moisie Bay, Labrador.
4 mean	9.8	19.1	4.3	10.0	3.4	22.8	9.6	11.0	9.1
max	9.8	19.7	4.4	10.0	3.5	23.5	10.1	11.3	9.8
min	9.7	18.6	4.1	9.9	3.3	22.1	9.3	10.8	8.9
	Zapus hudsonius pallidus, Mohawk Park, Oklahoma.
2 mean	9.7	18.4	4.3	9.9	3.7	21.5	9.3	11.0	8.7
max	10.1	18.8	4.3	9.9	3.7	21.8	9.4	11.0	8.7
min	9.3	18.0	4.3	9.8	3.7	21.1	9.2	11.0	8.6
	vicinity of Lawrence, Kansas.
10 mean	9.2	18.8	4.4	9.8	3.4	21.6	9.7	10.9	9.0
max	9.5	19.4	4.8	10.2	3.6	22.4	10.1	11.6	9.4
min	8.9	18.1	4.0	9.3	3.3	21.0	9.0	10.3	8.8
	2 mi. S Schuyler, Nebraska.
1	9.2	18.5	4.4	9.5	3.3	21.5	9.6	10.4	9.1
	Zapus hudsonius pallidus, Valentine National Wildlife Refuge, Nebraska.
1	10.0	19.6	4.5	10.5	3.5	22.9	10.0	11.6	9.3
	Zapus hudsonius preblei, Loveland, Colorado.
2 mean	9.6	18.5	4.1	10.0	3.6	22.3	9.6	10.4	9.1
max	9.6	19.0	4.2	10.0	3.6	22.4	9.8	10.6	9.1
min	9.5	18.0	3.9	10.0	3.6	22.2	9.4	10.2	9.1
	Spring Hill, 12 mi. N Laramie Peak, 6300 ft., Wyoming.
1	9.8	19.2	4.1	10.2	3.6	22.8	10.2	10.7	9.3
	Zapus hudsonius tenellus, Hazelton, 959 ft., British Columbia.
2 mean	9.6	19.4	4.4	10.1	3.5	22.9	9.6	10.9	9.2
max	9.6	19.5	4.4	10.2	3.5	23.0	9.6	10.9	9.2
min	9.6	19.3	4.3	10.0	3.4	22.7	9.6	10.8	9.2
	Cottonwood P. O., British Columbia.
2 mean	9.5	19.5	4.4	10.1	3.5	22.8	9.7	10.8	9.2
max	9.6	19.6	4.5	10.2	3.5	22.8	9.8	10.9	9.3
min	9.3	19.4	4.2	10.0	3.4	22.7	9.6	10.7	9.1
	S end Swan Lake, British Columbia.
2 mean	9.4	19.7	4.1	10.0	3.6	22.9	10.1	10.9	9.5
max	9.4	19.7	4.2	10.2	3.6	23.2	10.2	10.9	9.6
min	9.3	19.6	4.0	9.8	3.5	22.6	10.0	10.8	9.4
	Indianpoint Lake, 15 mi. NE Barkerville, British Columbia.
4 mean	9.6	18.9	4.1	9.9	3.4	21.9	9.5	10.8	9.0
max	9.6	19.6	4.2	10.0	3.6	23.0	9.8	11.3	9.4
min	9.4	18.3	4.0	9.8	3.3	21.3	9.1	10.2	8.8

LITERATURE CITED

Allen, J. A.

1894. Cranial variation in Neotoma micropus due to growth and individual differentiation. Bull. Amer. Mus. Nat. Hist., 6:233-246, 1 pl., August 3, 1894.