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قراءة كتاب Geographic Distribution of the Pocket Mouse, Perognathus fasciatus
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Geographic Distribution of the Pocket Mouse, Perognathus fasciatus
immature fasciatus.
Figs. 2-7. Skulls of two species of pocket mice. All × 1-1/2. In comparison with P. flavescens note that P. fasciatus has the tympanic bullae separated anteriorly and that the skull is slightly larger in over-all dimensions.Figs. 2-4. Perognathus fasciatus fasciatus. Buford, Williams County, North Dakota, May 6, 1910, [** Male], No. 168599 USBS.
Figs. 5-7. Perognathus flavescens flavescens, Kennedy, Cherry County, Nebraska, July 9, 1935, [** Female], No. 66883 MVZ.]
In the original description Swenk indicated the type locality as Chadron, Dawes County, Nebraska. The locality given on the specimen label of the holotype, however, is 5 mi. E Chadron. In addition, Swenk (loc. cit.), in the paragraph preceding the description of olivaceogriseus, states that the holotype was actually taken on Little Bordeaux Creek, sec. 14, T. 33 N, R. 48 W, 3 mi. E Chadron, on the farm of L. M. Gates, who obtained the holotype. It seems best to restrict the type locality to the place last mentioned.
Four specimens from southeastern Alberta recently reported by Moore (1953:143) have been examined and seem best referred, among known subspecies of fasciatus, to P. f. olivaceogriseus. They differ from the latter in several minor cranial features and more drab back, sides and lateral line. When adequate material is available they may prove to be subspecifically different from olivaceogriseus. Moore referred these specimens to P. f. fasciatus.
Specimens from extreme northwestern Nebraska, including the holotype, are slightly darker than specimens from eastern Wyoming. A specimen from Ft. Steele, Wyoming, shows approach to P. f. litus in pale dorsal coloration.
Specimens examined.—Total number, 59, as follows: Alberta: Foremost, 2 (UADZ). Manyberries, 1 (Alberta Dept. Pub. Health). Medicine Hat, 1 (Alberta Dept. Pub. Health). Montana: Carter County: Little Missouri River, 8 mi. NE Albion, 1 (USBS). Custer County: Calf Creek, 2 (AMNH); 13 mi. E Miles City, 1 (MZ). Garfield County: Piney Buttes, 1 (USBS). Powder River County: Powderville, 2 (USBS). Yellowstone County: Lake Basin, 1 (USBS). County undesignated: Wolf's Creek, 1 (AMNH). Nebraska: Cherry County: 10 mi. E Gordon, 1 (CNHM); 12 mi. ESE Gordon, 2 (CNHM). Dawes County: Chadron State Park, 1 (NGFPC); 1 mi. SW Chadron, 1 (NSM); Little Bordeaux Creek, 3 mi. E Chadron, 1 (MVZ); 10 mi. S Chadron, 3 (MZ); 3 mi. SW Crawford, 1 (KU). Sheridan County: Mirage Township, 1 (MZ). Sioux County: Glen, 1 (NSM); Monroe Canyon, 1 (NGFPC). South Dakota: Custer County: Cheyenne River, 1 (AMNH); Elk Mountain, 4800 ft., 4 (USBS). Meade County: Smithville, 1 (USBS). Shannon County: Corral Draw, 3 (AMNH); Pine Ridge, 3 (CNHM 1, USBS 2). Washabaugh County: White River flood plain, 7 mi. S Kadoka, 1 (MZ). Wyoming: Campbell County: 1-1/4 mi. N, 1/2 mi. E Rockypoint, 3850 ft., 1 (KU). Carbon County: Ft. Steele, 1 (USBS). Fremont County: 40 mi. E Dubois, 1 (MZ). Hot Springs County: Kirby Creek, 5000 ft., 1 (USBS). Johnson County: 6-1/2 mi. W, 2 mi. S Buffalo, 5620 ft., 4 (KU); 1 mi. WSW Kaycee, 4700 ft., 1 (KU). Natrona County: Casper, 1 (USBS); 1 mi. NE Casper, 5150 ft., 1 (KU). Platte County: 2-1/2 mi. S Chugwater, 1 (KU). Sheridan County: Arvada, 2 (USBS); 5 mi. NE Clearmont, 3900 ft., 1 (KU).