You are here
قراءة كتاب Taxonomy of the Chipmunks, Eutamias quadrivittatus and Eutamias umbrinus
تنويه: تعرض هنا نبذة من اول ١٠ صفحات فقط من الكتاب الالكتروني، لقراءة الكتاب كاملا اضغط على الزر “اشتر الآن"
Taxonomy of the Chipmunks, Eutamias quadrivittatus and Eutamias umbrinus
(1951:42-43) states that "these two habitats are in immediate juxtaposition, the transition from one to the other often occurring in only a few feet ..." and again, "No one to my knowledge, has found any evidence in specimens from Utah of interbreeding of E. q. hopiensis with either E. q. adsitus [= E. umbrinus adsitus] or E. q. umbrinus [= E. u. umbrinus]." Benson (1935:449) states, "On Navajo Mountain these chipmunks [E. q. hopiensis] were most in evidence on rock outcrops surrounded by brush at the lower edge of the yellow pine zone. One was seen at about 9,500 feet in a south-facing rock outcrop near the spruce-fir forest, but no chipmunk of any kind was seen in the forest itself." This suggests that where only E. q. hopiensis occurs on a mountain this subspecies goes higher than on a mountain where E. u. adsitus also occurs. This same relationship between E. q. quadrivittatus and the subspecies of E. umbrinus that occurs in north-central Colorado was pointed out in the account of E. q. quadrivittatus.
Specimens examined.—Total number, 68.
Utah: Uintah Co.: E side of confluence of Green and White rivers, 1 mi. SE Ouray, 4,700 ft., 3 UU. Grand Co.: Colorado River above Moab, 1 UU; side canyon of Colorado River above Moab, 1 UU; Moab, up Colorado River, 1 UU; Moab, 4,500 ft., 4 UU; Moab Bridge over Colorado River, 3,995 ft., Moab, 1 UU; Colorado River, 5 mi. E Moab Bridge, 4,000 ft., 1 UU. Wayne Co.: Fruita, 1 UU.
Colorado: Moffat Co.: 11 mi. W and 11 mi. N Rangely, 6,000 ft., 3. Rio Blanco Co.: White River, 5 BS. Eagle Co.: McCoy, 2 BS. Mesa Co.: 1½ mi. S Loma, 4,600 ft., 1. Gunnison Co.: 1 mi. E Somerset, 6,100 ft., 1. Montrose Co.: 1 mi. E Naturita, 5,900 ft., 1. Dolores Co.: 1 mi. N Cahone, 6,900 ft., 1. Montezuma Co.: 1 mi. S Cortez, 5,000 ft., 1; Mesa Verde, 25 mi. SW Mancos, 7,000 ft., 2 BS.
Arizona: Navajo Co.: Keams Canyon, 80 mi. N Holbrook, 15 BS. Apache Co.: Summit, 8,000 ft., Luka Chukai Mountains, 15 mi. E Luka Chukai Navajo School, 8 BS; Wheatfield Creek, W slope Tunicha Mountains, 7,000 ft., 3 BS.
Eutamias umbrinus (J. A. Allen)
Diagnosis.—Size medium; pelage dark; sides dark; narrow cranial breadth; baculum distinguishable from that of any other species (E. palmeri excepted) by the combination of width of base more than ⅓ of length of shaft, distal ½ of shaft laterally compressed, and keel ¼ of length of tip.
Eutamias umbrinus umbrinus (J. A. Allen)
Tamias umbrinus J. A. Allen, Bull. Amer. Mus. Nat. Hist. 3:96, June, 1890.
Eutamias umbrinus, Miller and Rehn, Proc. Boston Soc. Nat. Hist. 30:45, December 27, 1901.
Type.—Male, adult, skull and skin, No. 186463 U. S. Nat. Mus., Biol. Surv. Coll.; from Blacks Fork, about 9,500 ft., Uinta Mountains, Utah; obtained on September 19, 1888, by Vernon Bailey; original No. 228.
Diagnosis.—Size medium; general tone of upper parts dark and shadowy; skull relatively small.
Description.—Color pattern: Head Pale Smoke Gray; facial stripes Fuscous Black to Snuff Brown; ear Fuscous Black; posterior margin of ear and postauricular patch grayish white; median dorsal dark stripe black with Sayal Brown along margins; lateral pair of dorsal dark stripes Sayal Brown or Fuscous Black mixed with Sayal Brown; outermost pair of dorsal dark stripes nearly absent; sides Sayal Brown mixed with Cinnamon; rump and thighs Sayal Brown mixed with Smoke Gray; antipalmar and antiplantar surfaces of feet Cinnamon-Buff; ventral surface of tail Ochraceous Tawny or Sayal Brown, with Fuscous Black around margin and Pinkish Buff around outermost edge; underparts creamy white with dark gray underfur. Skull: Large, with moderately inflated braincase and well developed zygomata. Baculum: One of the largest in the species.
Comparisons.—From Eutamias umbrinus adsitus, the subspecies to the south on the Wasatch Range, E. u. umbrinus differs in: Sides lighter; rump browner; hairs around outermost edge of tail tawnier (in freshly molted tails); shorter inner mandibular length.
From E. u. inyoensis, the subspecies to the west in central and northeastern Nevada and in northwestern Utah, E. u. umbrinus differs in: General tone of upper parts lighter; sides lighter; total length more; interorbital region broader.
For comparisons with E. u. sedulus, E. u. fremonti, and E. u. montanus, see the accounts of those subspecies.
Specimens examined.—Total number, 55.
Wyoming: Uinta Co.: 9 mi. S Robertson, 8,000 ft., 15; 10 mi. S and 1 mi. W Robertson, 8,700 ft., 5; 11½ mi. S and 2 mi. E Robertson, 9,200 ft., 1; 2 mi. E and 12 mi. S Robertson, Ashley Nat. For., 1; 13 mi. S and 2 mi. E Robertson, 9,200 ft., 1.
Utah: Rich Co.: Monte Cristo, 18 mi. W Woodruff, 8,000 ft., 2 UU. Summit Co.: 13½ mi. S and 2 mi. E Robertson [Wyoming], 4; 1 mi. N Bridger Lake R. S., 9,400 ft., 4. Wasatch Co.: Snake Creek Canyon, 3 mi. NW Midway, 6,000 ft., 1 UU. Uintah Co.: Paradise Park, 21 mi. W and 15 mi. N Vernal, 10,050 ft., 20.
Eutamias umbrinus adsitus J. A. Allen
Eutamias adsitus J. A. Allen, Brooklyn Institute Mus. Sci. Bull. 1:118, March 31, 1905.
Type.—Unsexed adult, skull and skin, No. 28728 Amer. Mus. Nat. Hist.; from Briggs Meadow, 10,000 ft., Beaver Mountains, Utah; obtained on August 20, 1904, by George P. Engelhardt.
Diagnosis.—Size medium; sides dark; general tone of upper parts dark; dorsal light and dark stripes strongly contrasting.
Description.—Color pattern: Head Cinnamon mixed with grayish white; stripe on margin of crown Verona-Brown or Bister; ocular stripe Fuscous Black mixed with Sayal Brown; submalar stripe Sayal Brown; ear Fuscous, Sayal Brown along anterior margin and Smoke Gray along posterior margin and on postauricular patch; median dorsal stripe black; lateral dorsal dark stripes Fuscous Black mixed with Russet; outermost dorsal dark stripes slightly darker or indistinguishable from sides in color; dorsal light stripes grayish white with Mikado-Brown along margins; outermost pair of dorsal light stripes nearly pure white; sides Russet mixed with Cinnamon or Ochraceous-Tawny; rump and thighs Smoke Gray mixed with Cinnamon-Buff, with a larger or smaller number of Fuscous Black hairs; antipalmar and antiplantar surfaces of feet Cinnamon-Buff; dorsal surface of tail black; ventral surface of tail Sayal Brown to Tawny; underparts white with dark underfur. Skull and Baculum: As in E. u. umbrinus.
Comparisons.—From E. u. inyoensis, the subspecies to the west, E. u. adsitus differs in: General tone of upper parts darker; sides darker; interorbital region wider; skull significantly deeper.
For comparison with E. u. umbrinus, E. u. sedulus, and E. u. montanus, see the accounts of those subspecies.
Remarks.—Specimens from West Rim, Zion National Park, 6,500 ft., Washington County, Utah, seem to be intergrades between E. u. adsitus and E. u. inyoensis, and are referable to E. u. adsitus.
Specimens examined.—Total number, 34.
Utah: Beaver Co.: Britts Meadow, Beaver Range Mountains, 8,500 ft., 13 BS. Wayne Co.: Donkey Lake, Boulder Mountain, 10,000 ft., 4 UU. Garfield Co.: Wildcat R. S.,