Sorex palustris navigator (Baird). Water Shrew.—An individual was observed by M. Raymond Lee at North Creek, seven miles west of Monticello, Abajo Mountains, 8000 feet, San Juan County, on July 10, 1954. Usually we are extremely reluctant to record sight records, but do so in this instance because the water shrew is so distinctive that it can be readily recognized and because the occurrence extends the known range approximately 80 miles southward in Utah. This individual was observed at close range while swimming and foraging in North Creek, and there can be no doubt of its identity.
Myotis yumanensis yumanensis (H. Allen). Yuma Myotis.—Durrant (1952:43) reported this subspecies from Utah on the authority of Hardy (1941:289) who had specimens from two localities in extreme southwestern Utah. Durrant (1952:41) referred specimen Number 6784, from Willow Creek, 25 miles south of Ouray, Uintah County, to Myotis lucifugus carissima. Restudy of this specimen reveals that it is Myotis yumanensis yumanensis. This identification has been corroborated by Dr. Philip H. Krutzsch, University of Pittsburgh, Pennsylvania, and extends the known range of the subspecies M. y. yumanensis approximately 300 miles northeastward in Utah. See also Krutzsch and Heppenstall (1955:126) who record specimens from 2 mi. SW Jensen.
Myotis subulatus melanorhinus (Merriam). Small-footed Myotis.—This bat previously was known from only seven localities in Utah, which indicated that it occurred in only the western and southern areas of the state. Four additional records are now available from the following localities: Logan Canyon Cave, 15 miles north of Logan, Cache County; Weber College Campus, Ogden, Weber County; University of Utah Campus, Salt Lake City, Salt Lake County; Six Mile Canyon, 3-1/2 miles east of Sterling, Sanpete County. These occurrences extend the known range to the eastward in Utah, and indicate a state-wide distribution. Specimens of the subspecies Myotis s. melanorhinus are recorded also from as far north as Double Springs, Custer County, Idaho (Davis, 1939:117).
Pipestrellus hesperus hesperus (H. Allen). Western Pipistrelle.—Heretofore, the northernmost known specimens of this bat from Utah were from Old Lincoln Highway, 18 miles southwest of Orr's Ranch, Tooele County. Specimen Number 7531 is now available from cliffs NE [3 mi.] Ogden, Weber County, and extends the known range of this species in Utah approximately 100 miles northeastward. This pipistrelle probably inhabits all of northern and northwestern Utah in suitable habitats. This probability is supported by Davis' (1939:120) report of a specimen from Salmon Creek, eight miles west of Rogerson, Twin Falls County, Idaho. See also Krutzsch and Heppenstall (1955:127) who record a specimen from, eastern Utah as far north as, Desert Springs which is 10 mi. SW Ouray, Uintah County.
Corynorhinus rafinesquii pallescens Miller. Long-eared Bat.—Formerly, the northernmost record of the long-eared bat in Utah was from east of Springville, Utah County. Specimens are now available from Goldhill, Tooele County, and from South Fork, Ogden River, Weber County. Professor J. S. Stanford, Department of Zoology, Utah State Agricultural College, informed us (by letter) that this bat is the common cave bat in Logan Canyon, Cache County. This northern extension of known area of occurrence of approximately 100 miles indicates that it probably is state-wide in distribution in suitable habitats. It can be inferred from Hall (1946:161) that the range of C. r. intermedius in Nevada extended northeastward into northwestern Utah, and Davis (1939:124) reported specimens from Bingham and Bannock counties, Idaho, that he referred to the above mentioned subspecies. This led Stanford to comment (in litt.) that bats of this species from northern Utah in Cache County might be C. r. intermedius. Insofar as we are aware, C. r. pallescens differs from C. r. intermedius only in being slightly paler. Our specimens from Goldhill and South Fork of the Ogden River are not beyond the range of color of specimens from elsewhere in the state that are referable to C. r. pallescens. Inasmuch as specimens are not available from Logan Canyon, we deem it best pending the acquisition of specimens from that locality to refer all members of this species from Utah to the subspecies C. r. pallescens.
Marmota flaviventer nosophora Howell. Yellow-bellied Marmot.—Durrant (1952:101) did not indicate that any species of the genus Marmota occurred on the mountains within the basin of Pleistocene Lake Bonneville. Furthermore, he commented (op. cit.:502) upon the dearth of sciurids within this basin. One specimen, No. 10,905, of the subspecies M. f. nosophora has been taken from South Willow Canyon, 10,000 feet, base of Deseret Peak, Stansbury Mountains, Tooele County. This specimen is noteworthy not only in that it extends the known range of this kind of mammal 50 miles to the west in Utah, but in that it is well within the basin of the ancient lake. The marmot is common in the Wasatch Mountains on the eastern mainland of Lake Bonneville, but to date has not been found on the Oquirrh Mountains immediately to the west. The Oquirrh Mountains are interposed between the Stansbury and Wasatch mountains. The presence of the marmot on the Stansbury Mountains indicates that it probably occurs also on the Oquirrh Mountains.
Citellus beldingi crebrus Hall. Belding Ground Squirrel.—Durrant (1952:113) had only two specimens of this ground squirrel from Standrod, Boxelder County. Additional specimens have been obtained from the following localities in northwestern Boxelder County: Grouse Creek, Park Valley, Grouse Creek Mountains, 12 miles northwest of Grouse Creek, and Goose Creek. C. b. crebrus now is known to inhabit all the major drainages of the Raft River, Goose Creek, and Grouse Creek mountains. In addition to extending the known area of occurrence of this animal in Utah, these specimens prove also that this species is not restricted to the Snake River Drainage as Durrant (1952:113) supposed, but occurs also in the Great Basin Drainage.
Citellus richardsonii elegans (Kennicott). Richardson Ground Squirrel.—Recently, Hansen (1953:132) reported on specimens of this species from Rich and Summit counties. Additional specimens are now available from Highway 165 [2 mi. E Summit—Daggett Co. Line], 2 miles south of Utah-Wyoming State Line; 5 miles west of Manila, and one mile northeast of Manila (Carnegie Museum). These localities are in Daggett County. The occurrence of these ground squirrels in Rich, Summit and Daggett counties suggests that they occur along the entire northern piedmont of the Uinta Mountains.
Citellus lateralis trepidus (Taylor). Golden-mantled Ground Squirrel.—Durrant (1952:126) estimated that practically all of the area in Utah that is within the Great Basin might be included in the range of this subspecies. Actually, he had specimens from only the Raft River Mountains in northwestern Boxelder County. He included sight records from the Deep Creek Mountains and from the Oquirrh Mountains. Subsequently two specimens, numbers 7469A and 7470A, were obtained from the Deep Creek Mountains. To date neither specimens nor subsequent sight records have been obtained from the Oquirrh Mountains, and we are of the opinion that Durrant erred, and that the golden-mantled ground squirrel does not inhabit these mountains. Therefore, it seems at this writing that this subspecies, in Utah, occurs only in the extreme western and northwestern parts of the state in the Deep Creek and Raft River mountains, and not within the basin of Pleistocene Lake Bonneville as formerly supposed.
Eutamias umbrinus umbrinus (J. A. Allen). Uinta Chipmunk.—Two specimens, numbers 10,236 and 10,237, from the junction of Argyle and Minnie Maud creeks, Carbon County, prove that members of this subspecies occur on the West Tavaputs Plateau, which is outside the range ascribed to this subspecies by White (1953:572) and by Durrant (1952:142). The grayish color of these specimens and the reduction of ochraceous pigments constitute basis for referring the specimens to E. u. umbrinus, and not to E. u. adsitus or E. u. montanus. E. u. umbrinus on the West Tavaputs Plateau is separated from E. u. montanus on the East Tavaputs Plateau by the Green River and its deep chasm.