Snow Ranch, Hall Ranch, Steep Creek, Garfield County; Aquarius Guard Station, Aquarius Plateau, Wayne County. Insofar as we are aware, these occurrences are the first to be recorded from Utah, and extend the known range of this subspecies 150 miles northward.

The specimens from Washington County are paler than those from Garfield County, and this pallor indicates intergradation with the subspecies P. p. olivaceus. Of animals from the Aquarius Plateau, those from the eastern and southern localities are pale and have a marked suffusion of ochraceous in the upper parts, whereas those from the western and northern localities are extremely dark owing to a heavy suffusion of black in the upper parts. The skulls of animals from the Aquarius Plateau resemble those of P. p. trumbullensis in the majority of diagnostic characters. In some few characters, nevertheless, the skulls resemble those of P. p. olivaceus, and in other characters are intermediate between these two named subspecies. In shape and size of the interparietal, in slightly longer nasals, and in slightly greater alveolar length of upper molariform teeth, animals from the Aquarius Plateau differ from either of the aforementioned subspecies. All characters considered, we deem it best to refer these specimens to the subspecies P. p. trumbullensis.

Thomomys talpoides bridgeri Merriam. Northern Pocket Gopher.—An adult female, Catalogue No. 25667 of the Museum of Natural History of the University of Kansas, skin with skull, was trapped, on 30 June 1948, 14 miles south and 2 miles east of Robertson, 9,300 feet, in Summit County, Utah, by James O. Lonnquist (original number 146). This is the first record of this subspecies from Utah, and raises to 37 the named kinds of pocket gophers known from Utah.

Reithrodontomys megalotis megalotis (Baird). Western Harvest Mouse.—Durrant (1952:295) reported no harvest mice from the Uinta Basin in northeastern Utah. One specimen, No. 10,239, was obtained from two miles east of Duchesne, Duchesne County. This specimen extends the known range in Utah 50 miles northward, and indicates that the harvest mouse of the subspecies R. m. megalotis occurs throughout the Uinta Basin.

Onychomys leucogaster pallescens Merriam. Northern Grasshopper Mouse.—Hansen obtained specimens (in alcohol) from Kennedys Hole, junction of the White and Green rivers, Uintah County. The northernmost specimens available to Durrant (1952:328) were from one mile east of Greenriver, Grand County. These specimens from Uintah County extend the known range 80 miles to the north, and substantiate Durrant's conclusion that this subspecies occurs east of the Green and Colorado rivers.

Clethrionomys gapperi uintaensis Doutt. Red-backed Mouse.—Previously, the red-backed mouse in Utah was known only from the Uinta and Wasatch mountains. The southernmost localities from which specimens were available were in northern Wasatch County and southern Salt Lake County. Durrant (1952:355) supposed that the species ranged southward to Mount Timpanogos in Utah County. One specimen, No. 10,075, from the summit, 18 miles east of Mayfield, Sanpete County, and 4 from Ephraim Canyon, 15 miles east of Ephraim, Sanpete County, show that this subspecies occurs also on the Wasatch Plateau of central Utah. These latter specimens extend the known range of the red-backed mouse in Utah approximately 100 miles southward. Owing to the practically continuous nature of the central mountain ranges of Utah, students of mammals of Utah usually suspect that most montane mammals occur throughout these mountain ranges. The red-backed mouse has been sought for in vain in the mountains south of the Wasatch Plateau. Suitable habitats for this mouse occur throughout the Fishlake Mountains, Thousand Lake Mountains and the Aquarius Plateau, but despite