cover of vegetation or surface litter. Bailey (1932:227) writes that in
New Mexico jumping mice of this species use fibers of grass to construct
a ball-shaped nest. The nest usually has one opening but sometimes there
are two. In the Ruby Mountains, of Nevada, Borell and Ellis (1934:37)
found the globular nests of this mouse on the ground in tall grass.
=Zapus princeps cinereus= Hall
_Zapus princeps cinereus_ Hall, Univ. California Publ. Zool., 37:7,
April 10, 1931.
_Type._--Female, adult, skin and skull; No. 45422, Mus. Vert. Zool.;
Pine Canyon, 6600 feet altitude, Raft River Mountains, 17 mi. northwest
Kelton, Boxelder County, Utah; obtained on July 14, 1930, by Annie M.
Alexander; original No. 689.
_Range._--Raft River Mt's in northwestern Utah and in isolated mountains
in southern Idaho. See fig. 46. Zonal range: Transition and Canadian.
_Description._--Size, medium; back with broad mid-dorsal band, varying
from pale brown mixed with Pinkish-Buff to dark brown mixed with Warm
Buff or Ochraceous-Buff; sides varying from near Pinkish-Buff to near
Ochraceous-Buff; ventral surface white to base of hairs, not suffused
with other color; tail bicolored, pale brown above and white to
yellowish-white below; ears dark, edged with white or yellowish-white;
upper teeth divergent anteriorly; auditory bullae small; skull
relatively long; zygomata relatively weak and not widely bowed; nasals
wide posteriorly; pterygoid fossae relatively narrow.
_Comparisons._--From _Zapus princeps nevadensis_, _Z. p. cinereus_
differs as follows: Size averaging smaller; entire coloration lighter;
zygomata not so widely bowed; incisive foramina not so wide posteriorly;
auditory bullae smaller; nasals wider posteriorly; pterygoid fossae
narrower.
From _Zapus princeps idahoensis_, _Z. p. cinereus_ can be distinguished
by: generally paler color; smaller auditory bullae; broader interorbital
region; anteriorly diverging tooth-rows; narrower pterygoid fossae.
For comparison with _Zapus princeps utahensis_ see account of that
subspecies.
_Remarks._--Davis (1939:343) writes that "since _cinereus_ was described
from nine specimens, only two of which are near adult, one cannot place
much value on the coloration ascribed to it by Hall (1931:7)." I
examined the type series and found, as did Davis (_loc. cit._), that the
type is much lighter and grayer than is a near adult paratype, which was
obtained the same day; however, I do not concur with Davis (_loc. cit._)
that specimens from Mt. Harrison, 10 mi. S Albion, Idaho, which are
darker and much more ochraceous than the paratype, necessarily are more
nearly typically colored. These individuals, judged by cranial
characters, are more nearly typical of _cinereus_ but show
intergradation with _Z. p. idahoensis_ in their darker and more
ochraceous pelage.
Durrant (1952:387) found that the gray color of _Z. p. cinereus_ was not
diagnostic in separating _Z. p. cinereus_ from _Z. p. utahensis_,
because gray animals are also found in _Z. p. utahensis_. Specimens from
Camp Tendoy, Pocatello, Idaho, are intermediate in color and in cranial
characters as between _Z. p. idahoensis_ and _Z. p. cinereus_, but here
are referred to _Z. p. cinereus_. Whitlow and Hall (1933:268) compared
these individuals with specimens of _Z. p. princeps_ and _Z. p.
cinereus_, finding them intermediate but in the aggregate of several
differential characters better referred to the latter.
_Specimens examined._--Total, 35, distributed as follows:
IDAHO: _Bannock County_: Camp Tendoy, Pocatello, 2 (MVZ). _Cassia
County_: Mt. Harrison, 10 mi. S Albion, 16 (MVZ).
UTAH: _Boxelder Co._: _south fork of George Creek, 5 mi. SE Yost, Raft
River Mts., 6700 ft._, 1 (UU); _George Creek, 7 mi. SE Yost, Raft River
Mts., 6500 ft._, 6 (UU); _Pine Canyon, 6600 ft., 17 mi. NW Kelton, Raft
River Mts._, 8 (MVZ); Pine Creek, 3 mi. N Rosette, Raft River Mts., 6100
ft., 2 (UU).
_Marginal records._--Idaho: Camp Tendoy, Pocatello. Utah: Pine Creek, 3
mi. N Rosette, Raft River Mts., 6100 ft. Idaho: Mt. Harrison, 10 mi. S
Albion.
=Zapus princeps curtatus= Hall
_Zapus princeps curtatus_ Hall, Univ. California Publ. Zool., 37:7,
April 10, 1931.
_Zapus princeps oregonus_, Taylor, Univ. California Publ. Zool.,
7:281, June 24, 1911.
_Type._--Female, adult, skin and skull, No. 7991, Mus. Vert. Zool.; head
of Big Creek, 8000 feet altitude, Pine Forest Mountains, Humboldt
County, Nevada; obtained on June 30, 1909, by Walter P. Taylor and C. H.
Richardson, original No. 777 of W. P. T.
_Range._--Pine Forest Mt's, Humboldt County, Nevada. See fig. 46. Zonal
range: Transition and Canadian.
_Description._--Size medium; back pale near Light Ochraceous-Buff with
admixture of black hair forming dark dorsal band; sides lighter than
back; lateral line faintly indicated; ventral surface white; tail
bicolored, grayish-white to yellowish-white below and pale brown above;
ears dark, edged with yellowish-white; feet grayish-white above; palatal
bridge short; tooth-rows almost parallel; mastoid region of skull
relatively narrow; incisive foramina wide posteriorly; narrow across
zygomata; nasals relatively narrow posteriorly.
_Comparisons._--For comparison with _Zapus princeps oregonus_ see
account of that subspecies.
_Remarks._--This jumping mouse, which was described from the Pine Forest
Mountains, closely resembles _Zapus princeps oregonus_ but differs in
lighter color, slightly smaller body, less divergent tooth-rows,
shorter palate, and narrower skull across the mastoid region.
The Pine Forest Mountains are isolated from neighboring boreal regions
by a belt of the Upper Sonoran Life-zone, which is inhospitable to
_Zapus_; therefore, intergrades between _Z. p. oregonus_ and _Z. p.
curtatus_ are not known and probably do not exist. Nevertheless, _Z. p.
curtatus_ shows close affinity with _Z. p. oregonus_, as indicated by
Taylor (1911:281), and I agree with Hall (1931:7) that the relationships
of _Z. p. curtatus_ are best expressed by arranging it as a subspecies
of _Zapus princeps_.
_Specimens examined._--Total, 18, all from Nevada, distributed as
follows: _Humboldt County_: Pine Forest Mts.; Alder Creek, 6000 ft., 2
(MVZ); head of Big Creek, 8000 ft., 14 (MVZ); _Leonard Creek, 6500 ft._,
2 (MVZ); Meadow, 1 (MVZ).
_Marginal records._--Nevada: Pine Forest Mts., Alder Creek; Meadow.
=Zapus princeps idahoensis= Davis
_Zapus princeps idahoensis_ Davis, Jour. Mamm., 15:221, August 10,
1931.
_Jaculus hudsonius_, Allen, Bull. Essex Inst., 6:61, April, 1874
(part--the part in Carbon County, Wyoming).
_Zapus hudsonius_, Merriam, N. Amer. Fauna, 5:72-73, July 30, 1891.
_Zapus princeps princeps_, Preble, N. Amer. Fauna, 15:22-23, August
8, 1899 (part).
_Type._--Male, adult, skin and skull; No. 54845, Mus. Vert. Zool.; 5 mi.
E Warm Lake, 7000 ft., Valley County, Idaho; obtained on July 9, 1932,
by Robert T. Orr; original No. 660.
_Range._--From Banff, Alberta, southward through extreme southwestern
Alberta and extreme southwestern British Columbia, most of the panhandle
of Idaho, Kamiak Butte in eastern Washington, western Montana, and
western Wyoming (Green, Wind River and Absoroka ranges of the Rocky
Mt's). See fig. 46.
_Description._--Size, medium; back from near Clay Color to near Warm
Buff, usually overlaid with black hairs forming broad dorsal band; sides
lighter than back; lateral line indistinct or wanting; belly pure white,
occasionally faintly tinged with Ochraceous-Buff; tail indistinctly
bicolored, tan to grayish-white below and pale brown above; hind feet
grayish-white above; ears dark, edged with white or yellowish-white;
postpalatal notch anterior to posterior border of last molars; proximal
part of inferior ramus of zygomatic process of maxillary relatively
narrow and usually without enlarged median projection; auditory bullae
well inflated; incisive foramina relatively narrow.
_Comparisons._--From _Zapus princeps kootenayensis_, _Z. p. idahoensis_
differs as follows: Size averaging larger; upper parts with greater
suffusion of ochraceous, not grayish or dusty; skull larger; incisive
foramina longer and relatively wider; zygomatic breadth averaging
greater; nasals broader at tips; auditory bullae more inflated.
From _Zapus princeps oregonus_, _Z. p. idahoensis_ differs in: Size
averaging smaller; upper parts generally more suffused with black hairs,
on the average more yellowish with less ochraceous; skull smaller;
incisive foramina narrower (breadth less, instead of more, than 52 per
cent of length); palatal bridge shorter; zygomatic arch shorter;
pterygoid fossae narrower.
From _Zapus princeps utahensis_, _Z. p. idahoensis_ can be distinguished
by: Size less; color slightly darker; skull averaging smaller in
zygomatic breadth, least interorbital constriction, and occipitonasal
length; palate narrower; upper tooth-rows nearly parallel as opposed to
diverging anteriorly.
From _Zapus princeps minor_, _Z. p. idahoensis_ differs in: Size larger;
color of underparts less ochraceous; lateral line indistinct or wanting;
skull averaging larger in all measurements taken except that the two
subspecies are approximately same in least interorbital constriction,
length of zygomatic arch, and distance from anterior face of incisors to
postpalatal notch; nasals, in profile, straight instead of with proximal
third depressed; postpalatal notch anterior to posterior face of last
molar, instead of even with, or usually posterior to, same.
From _Zapus princeps saltator_, _Z. p. idahoensis_ differs as follows:
Size averaging slightly larger; color darker, being less ochraceous and
more yellow dorsally and laterally; auditory bullae more inflated;
zygomatic arches less bowed laterally; incisive foramina narrower.
For comparison with _Zapus princeps princeps_ and _Zapus princeps
cinereus_ see accounts of those subspecies.
_Remarks._--Intergradation occurs at almost all of the places where the
range of _Z. p. idahoensis_ is known to touch that of any other
geographic race. Nevertheless, each of the populations studied has
characters which make this subspecies recognizable as a taxonomic unit,
although its characters are not yet stabilized even in the central part
of its range.
Among named subspecies of _Zapus princeps_, _Zapus p. idahoensis_ most
closely resembles _Zapus princeps kootenayensis_, its nearest geographic
neighbor to the north. Three specimens from 2 mi. NE Weippe, 3000 ft.,
Idaho, are best referred to _Z. p. idahoensis_ but show relationship to
_Z. p. kootenayensis_ in size and shape of the tympanic bullae. The
relationship of individuals from Idaho, here referred to _Z. p.
idahoensis_, from Glidden Lakes, Enaville, Cascade Creek, and 13 mi. E
and 5 mi. N Coeur d'Alene, is discussed in the account of _Z. p.
kootenayensis_. British Columbian specimens from Newgate and Crows Nest
Pass, 4450 ft., as well as Albertan specimens from Crows Nest Pass and
various places in Waterton Lake Park, resemble _Z. p. kootenayensis_ in
color but cranially are more nearly like _Z. p. idahoensis_.
Intergradation with _Zapus princeps oregonus_ was noted by Davis
(1939:340) in a specimen from Cedar Mountain in Idaho. I have not seen
this individual which he referred to _Z. p. idahoensis_ but have seen a
specimen from the N Fork of Potlatch River (15 mi. SE Cedar Mt.), which,
in color, closely resembles _Z. p. oregonus_ but cranially (shape of
incisive foramina, size, and inflation of auditory bullae) is more
nearly like _Z. p. idahoensis_ to which it is referred. Davis (_loc.
cit._) indicates that specimens from summit of Smith Mt., from 1 mi. N
Bear Creek R. S., from 1/2 mi. E Black Lake, and from 3 mi. W Payette
Lake, Idaho, are in an area of intergradation between _Z. p. oregonus_
and _Z. p. idahoensis_, but he referred them to _Z. p. idahoensis_ on
the basis of cranial characters and length of hind foot. Seven specimens
from Alturas Lake, 7000 ft., Idaho, were likewise so allocated by Davis
(_loc. cit._). I concur with him and in addition refer the following
intermediate individuals from Idaho to _Z. p. idahoensis_: New Meadow,
1; Warren, 1; Perkins Lake, 7000 ft., Sawtooth Nat'l Forest, 1; Prairie
Creek, 12 mi. W Ketchum, 2400 ft., 3. All are more nearly like _Z. p.
oregonus_ in color but cranially they show more resemblance to _Z. p.
idahoensis_.
In the eastern part of the range of _Z. p. idahoensis_, intergradation
occurs with _Zapus princeps minor_, as at 15 mi. S Heath, N Fork Flat
Willow Creek, Big Snowy Mt's, Montana. Specimens from there have the
lateral line enlarged and the maximum seen in this species of Ochraceous
color ventrally. The pterygoid fossae are large and the bullae are
reduced as in _Z. p. minor_, but in the sum total of the characters the
mice more closely resemble _Z. p. idahoensis_. At Lewistown, 7 mi. NE
Judith Mt's, Lime Kiln Gulch, Montana, the animals are colored as are
_Z. p. minor_ but cranially are like _Z. p. idahoensis_ to which they
are referred. Specimens from the Highwood Mt's, Montana, also are
intergrades; they have a relatively distinct lateral line as in _Z. p.
minor_ but show no ventral suffusion of Ochraceous; they have large
bullae, nasals that are straight in lateral profile and other cranial
characters of _Z. p. idahoensis_ to which they are here referred.
A single specimen from Kamiak Butte, Whitman County, Washington, has
been referred to _Z. p. idahoensis_ by Dalquest (1948:373). I have not
seen this individual, but, on geographic grounds, it is likely to be of
this subspecies.
_Specimens examined._--Total, 342, distributed as follows:
ALBERTA: Boom Creek, 5600 ft., 27 mi. W Banff, 2 (NMC); _Banff, Cascade
Basin_, 2 (NMC); _Bryant Creek, Banff Park_, 1 (NMC); _Spray River, 7
mi. Cabin, Banff Park_, 3 (NMC); Crows Nest Pass, 2 (NMC); Waterton
Lakes Park, 16 (NMC); _Linnets Pond, Waterton Lakes Park_, 4 (NMC);
_Bertha Creek, Waterton Lakes Park_, 8 (NMC).
BRITISH COLUMBIA: Vermilion Crossing, Kootenay, 1 (ROM); Paradise Mine,
3 (PM); Crows Nest Pass, 4450 ft., 3 (NMC); Newgate, 10 (NMC).
IDAHO: _Adam Co._: 1/2 mi. E Black Lake, 6800 ft., 8; _summit of Smith
Mtn., 7500 ft._, 9 (3 MVZ); 1 mi. N Bear Creek R. S., SW Slope Smith
Mtn., 5400 ft., 13; New Meadows, 1 (USBS); _3 mi. W Payette, 5400 ft._,
4 (MVZ). _Blaine County_: _Perkins Lake, 7000 ft., Sawtooth Nat'l
Forest_, 1; _Alturas Lake, 7000 ft._, 3 (MVZ); Prairie Creek, 12 mi. NW
Ketchum, 2400 ft., 3. _Clearwater County_: 2 mi. NE Weippe, 3000 ft., 3
(MVZ). _Custer County_: Loon Creek R. S., 6000 ft., Challis Nat'l
Forest, 2; _Head Pahsimeroi River_, 2 (MVZ); Mill Creek, 14 mi. WSW
Challis, 8370 ft., 1 (MVZ). _Fremont County_: 7 mi. W West Yellowstone,
7000 ft., 3; _17 mi. E and 4 mi. N of Ashton, 6275 ft._, 9 (MVZ). _Idaho
Co._: Packers Meadow, near state line, South Lobo Hot Springs, 5150 ft.,
7 (USBS); _Warren_, 1 (USBS). _Kootenai Co._: 13 mi. E and 5 mi. N Coeur
d'Alene, 5; _Cascade Creek, 36 mi. E Coeur d'Alene, Coeur d'Alene Nat'l
Forest_, 1 (USBS). _Latah Co._: N Fork Potlatch River, 1 (USBS). _Lemhi
County_: Salmon River Mts., 3 (USBS). _Shoshone Co._: Enaville 1 (USBS);
_Glidden Lakes, 5700 ft._, 4 (MVZ). _Valley County_: 5 mi. E Warm Lake,
7000 ft., 6 (MVZ); _5 mi. W Cape Horn, 7000 ft., Sawtooth Range_, 1
(MVZ).
MONTANA: _Beaverhead County_: Birch Creek, 18 mi. NE Dillon, 7100 ft.,
14 (MVZ). _Carbon Co._: _Pryor Mts._, 1 (USBS); 2 mi. E Shriver, 6500
ft., 6 (MVZ). _Cascade Co._: Neihart, 1 (USBS). _Chouteau Co._: _Upper
Muddy_, 1 (USBS); Highwood Mts., 2 (USBS). _Fergus Co._: Lime Kiln
Gulch, 7 mi. NE Judith Mts., 3 (USBS); 15 mi. S Heath, N Fork Flat
Willow Creek, 8 (USBS); _10 mi. W Tyler, N Fork Flat Willow Creek_, 1
(USBS); _Crystal Lake, 6000 ft., Big Snowy Mts._, 3 (UM). _Flathead
Co._: Waterton Lake, 1 (USBS); _Crosley Lake, Glacier Nat'l Park_, 1
(USBS); Paola, 1 (USBS); _Summit_, 2 (USBS); _1 mi. W and 2 mi. S
Summit, 5000 ft._, 12. _Gallatin Co._: 4 mi S Logan, Camas Creek, Big
Belt Mts., 5 (USBS); Gallatin Gateway, 5 (SDM); west fork West Gallatin
River, 6500 ft., 6 (USBS). _Glacier Co._: Babb, 1 (LMH); _2-1/2 mi. W
and 1-1/2 mi. S Babb, 4700 ft._, 1; _Many Glaciers, 4900 ft., Glacier
Nat'l Park_, 5 (MVZ); _6 mi. S St. Marys, 6500 ft._, 1; _St. Marys
Lake_, 7 (USBS); _McDermit Lake_, 1 (USBS); Blackfoot Agency, 1 (USBS).
_Golden Valley County_: _Swimming Woman Canyon, 3/4 mi. S Fergus County
line, Big Snowy Mts._, 4 (UM). _Judith Basin Co._: _Little Belt Mts.,
Dry Wolf Creek, 20 mi. SW Stanford_, 4 (USBS); 13 mi. W Buffalo, 1
(USBS). _Madison Co._: 12 mi. SW Alder, Hinch Creek, Ruby Mts., 2
(USBS). _Meagher Co._: _16 mi. N White Sulphur Springs, Little Belt
Mts._, 7 (USBS). _Park County_: _West Boulder Creek, 18 mi. SE
Livingston_, 1 (USBS); Emigrant Gulch, 3 mi. SE Chico, 6500 ft., 4
(USBS); 2 mi. NE Cooke, 8000 ft., 22 (MVZ). _Ravalli County_: 3 mi. SW
Florence, 3700 ft., 1; 6 mi. E Hamilton, 3700 ft., 1. _Sanders Co._:
Prospect Creek, near Thompson, 1 (USBS). _Sweet Grass Co._: _near head
of Big Timber Creek, 5200 ft., Crazy Mts._, 11 (USBS); Brannin Ranch,
Sweet Grass Creek Canyon, 6 (UM); _Big Timber_, 1 (USBS). _Teton
County_: 17-1/2 mi. W and 6-1/2 mi. N Agusta, 5100 ft., 2.
WYOMING: _Fremont County_: Moccasin Lake, 19 mi. W and 4 mi. N of
Lander, 10,000 ft., 1; 23-1/2 mi. S and 5 mi. W Lander, 8600 ft., 4.
_Park County_: 31-1/2 mi. N and 36 mi. W Cody, 6900 ft., 7; _28 mi. N
and 30 mi. W Cody, 7200 ft._, 1; _16-1/4 mi. N and 17 mi. W Cody, 5625
ft._, 14; 2 mi. S and 42 mi. W Cody, 6400 ft., 5; 12 mi. W Wapiti, 6
(LMH); _25 mi. S and 28 mi. W Cody, 6350 ft._, 5. _Sublette County_: E
end Island Lake, 10,600 ft., 3 mi. S Fremont Park, 1; _N side Halfmoon
Lake, 7900 ft._, 3; _W end Halfmoon Lake, 7900 ft._, 2; _10 mi. NE
Pinedale, 8000 ft._, 1; _5 mi. E and 8 mi. N Pinedale, 7500 ft._, 1; 3
mi. E and 5 mi. N Pinedale, 7500 ft., 4; 19 mi. W and 2 mi. S Big Piney,
7700 ft., 3.
_Marginal records._--Alberta: Boom Creek, 5600 ft., 27 mi. W Banff;
Crows Nest Pass; Waterton Lakes Park. Montana: Highwood Mts.; 15 mi. S
Heath, N Fork Flat Willow Creek; 2 mi. E Shriver, 6500 ft. Wyoming:
23-1/2 mi. S and 5-1/2 mi. W Lander, 8600 ft.; 10 mi. W and 2 mi. S Big
Piney, 7700 ft. Idaho: 7 mi. W West Yellowstone, 7000 ft.; Prairie
Creek, 12 mi. NW Ketchum, 2400 ft.; 5 mi. W Warm Lake, 7000 ft.; 1 mi. N
Bear Creek R. S., SW slope Smith Mtn., 5400 ft.; N Fork Potlatch River;
13 mi. E and 5 mi. N Coeur d'Alene. British Columbia: Newgate; Vermilion
Crossing, Kootenay.
=Zapus princeps kootenayensis= Anderson
_Zapus princeps kootenayensis_ Anderson, Ann. Rept. Nat. Mus.
Canada for 1931:108, November 24, 1932.
_Zapus princeps princeps_, Preble, N. Amer. Fauna, 15:23, August 8,
1899 (part).
_Type._--Adult female, skin and skull, No. 10,020, Nat. Mus. Canada;
near summit of Green Mountain, head of Murphy Creek, about 10 miles
north of Rossland, West Kootenay district, British Columbia, at about,
6000 ft.; latitude 49° 13' north, longitude 117° 52' west; obtained on
July 18, 1929, by R. M. Anderson, original No. 24.
_Range._--From Glacier in the Selkirk Range, British Columbia, south to
5 mi. W Cocolalla, Bonner County, Idaho, west and north to Sullivan
Lake, Pend Oreille County, Washington; and northwestward to Manning Park
on the eastern summit of the Cascade Range in British Columbia. See fig.
46.
_Description._--Size, medium; color moderately dark; upper parts
noticeably dull and dusty; broad dorsal band of dull Ochraceous-Buff to
near Warm Buff sprinkled with black hair to a varying degree, resulting
in two color phases (dark has more black hair; Ochraceous phase or Warm
Buff phase has more brown hair); sides paler than back owing to fewer
black hairs; lateral line, when present, narrow and dull; ventral
surface pure white; tail bicolored, pale brown above, yellowish-white to
dull white below; ears dark with narrow white or yellowish-white
edgings; feet white above; skull narrow across zygomata; incisive
foramina narrow; bullae moderately inflated; nasals narrow at tips;
postpalatal notch anterior to posterior face of last molars; braincase
moderately narrow; zygomatic arch short.
_Comparisons._--From _Zapus princeps saltator_, _Z. p. kootenayensis_
differs as follows: Upper parts generally dull with less ochraceous;
sides with more yellow, less ochraceous; lateral line wanting or not
bright; skull averaging slightly smaller; incisive foramina smaller and
narrower posteriorly; small medium projection on inferior ramus of the
zygomatic process of maxillary frequently present instead of absent;
pterygoid fossae shorter and narrower.
For comparison with _Zapus princeps idahoensis_ see account of that
subspecies.
_Remarks._--This subspecies is paler and averages smaller than either of
the subspecies with adjoining geographic ranges. There is intergradation
with _Zapus princeps idahoensis_ in color, shape and size of incisive
foramina, and in the shape of the nasals in Idaho-taken specimens from
Glidden Lakes and Enaville. These individuals are thought to be _Z. p.
idahoensis_. Specimens from the same state taken at Cascade Creek and 13
mi. E and 5 mi. N Coeur d'Alene show intergradation in color, size and
inflation of bullae, configuration of nasals, and shape of the vomer
between _Zapus princeps idahoensis_ and _Z. p. kootenayensis_. The
majority of characters studied show these animals to be referable to _Z.
p. idahoensis_.
Specimens from Monashee Pass, 4000 ft., British Columbia, show
relationship to _Zapus princeps saltator_ in the posteriorly wide
incisive foramina, in the narrow vomer, and, in some individuals, in the
increased amount of ochraceous, dorsally and laterally. The majority of
characters studied show these animals to be referable to _Z. p.
kootenayensis_.
The animals available from Glacier, British Columbia, are in color more
nearly like _Z. p. saltator_ and cranially combine the characters of _Z.
p. idahoensis_, _Z. p. saltator_, and _Z. p. kootenayensis_. The sum
total of their characters places them with _Z. p. saltator_. Anderson
(1932:108) remarks on the disparity of size between the two sexes of _Z.
p. kootenayensis_, stating that females are considerably larger than
males. I have examined most of the material used in the original
description and find that animals of like age in the two sexes show no
significant size difference. Anderson (_loc. cit._) seems to have
compared young males with adult females.
_Specimens examined._--Total, 68, distributed as follows:
BRITISH COLUMBIA: Manning Park, 3 (PM); _Good Fellow Creek, Manning
Park_, 1 (PM); _Mt. Beaver Valley, 6300 ft., Manning Park_, 1 (PM);
_Timberline Valley, 6500 ft._, 3 (PM); _Allison Pass, 1 mi. E Manning
Park_, 1 (PM); Monashee Pass, 4000 ft., 13 (PM); Hope-Princeton Summit,
5500 ft., 1 (NMC); _Hedley, Stirling Creek_, 1 (NMC); Anarchist Mts., 1
(PM); Fairview-Keremeos Summit, 5 (NMC); _Westbridge_, 2 (NMC);
_Midway_, 2 (NMC); Green Mtn., near Rossland, 6000 ft., 12 (11 NMC, 1
MVZ); _Mt. Old Glory, 7000 ft., Rossland_, 5 (4 NMC, 1 MVZ); _Rossland,
5800 ft._, 12 (11 NMC, 1 MVZ); Camp 6, Meadow Creek, 7 mi. SE of Yahk, 1
(NMC).
IDAHO: _Bonner County_: 5 mi. W Cocolalla, 3500 ft., 2 (MVZ). _Boundary
County_: 4 mi. W Meadow Creek, 3000 ft., 2 (MVZ).
_Marginal records._--British Columbia: Monashee Pass, 4000 ft.; Camp 6,
Meadow Creek, 7 mi. SE Yahk. Idaho: 4 mi. W Meadow Creek, 3000 ft.; 5
mi. W Cocolalla, 3500 ft. British Columbia: Hope-Princeton Summit, 5500
ft.; Manning Park.
=Zapus princeps luteus= Miller
_Zapus luteus_, Miller, Proc. Biol. Soc. Washington, 24:253,
December 23, 1911.
_Zapus luteus australis_, Bailey, Proc. Biol. Soc. Washington,
26:132, May 21, 1913. Type from Socorro, Socorro County,
New Mexico.