(1908:95) reported this subspecies, under the name Peromyscus nebrascensis, from Glen, and Dice (1941:17) reported the subspecies from Agate, both localities being in Sioux County in the northwestern part of the State. Osgood (1909), however, did not mention Nebraskan specimens of this subspecies and excluded it from the State on his (op. cit.) distribution map of the subspecies of P. maniculatus. In addition, Quay (1948:181) reports, as P. m. nebrascensis, deer mice obtained by him in the badlands of northern Sioux County and adjacent Niobrara County, Wyoming. Four deer mice referable to P. m. osgoodi have been obtained from several localities on the Pine Ridge in Dawes County as follows: 3 mi. E of Chadron, 2; Chadron State Park, 1; 3 mi. SW of Crawford, 1. When compared with specimens of P. m. nebrascensis, geographically adjacent to the east, these mice are seen to be notably darker and less buffy than nebrascensis and to average significantly larger in both external and cranial measurements. All deer mice from the Pine Ridge and adjacent badlands of extreme northwestern Nebraska probably are best referred to P. m. osgoodi. External measurements of two adult females are respectively: Total length, 180, 175; length of tail-vertebrae, 78, 74; length of hind foot, 19, 20; length of ear, 17, 16.

Neotoma floridana campestris J. A. Allen. Florida Wood Rat.—Five wood rats from 5 mi. N, 2 mi. W of Parks, Dundy County, in extreme southwestern Nebraska, provide the first record of occurrence of this subspecies in Nebraska. These animals were trapped in outlying sheds at the Rock Creek State Fish Hatchery. Two large wood-rat houses were in a dense thicket of brush and young trees in a small draw on the west side of the most westwardly hatchery lake. Brown rats (Rattus norvegicus) inhabited a combination garage-storage barn at the hatchery and no wood rats were taken there.

Microtus pennsylvanicus pennsylvanicus (Ord). Pennsylvania Meadow Mouse.—This subspecies occurs in eastern and central Nebraska (see Bailey, 1900:18 and Swenk, 1908:104). Additional records of occurrence are as follows: 5 mi. E of Rising City, Butler County, 5; 4 mi. SE of Laurel, Cedar County, 1; Wayne, 2, and 2-1/2 mi. E of Wayne, 1, Wayne County; 2-1/2 mi. N of Ord, Valley County, 4.

Synaptomys cooperi gossii (Coues). Cooper Lemming Mouse.—Fichter and Hanson (1947:1-8) reported the first known occurrence of this microtine in Nebraska, recording specimens from several localities in Lancaster County and one from near Valentine, Cherry County. Recent records of this mouse which help to clarify its distribution in Nebraska are as follows: 4 mi. N, 1/2 mi. E of Octavia, Butler County, 1; 5 mi. N, 2 mi. W of Parks, Dundy County, 1; 1 mi. N of Pleasant Dale, Seward County, 1.

An adult female from Dundy County provides the westernmost record of distribution of the species in North America. The animal was trapped on November 1, 1952, in association with Microtus pennsylvanicus modestus in a marshy area at the Rock Creek State Fish Hatchery on spring-fed Rock Creek. The pelage on the back is notably darker than in S. c. gossii, and resembles S. c. paludis from the Cimarron River drainage in Meade County, Kansas, but in the sum total of its characters it most closely resembles S. c. gossii among named subspecies.

Mustela rixosa campestris Jackson. Least Weasel.—The least weasel occurs in eastern and central Nebraska (see Swenk, 1926:313-330 and Hall, 1951:192) but is known by only a single specimen from each locality of record save for the area around Inland, Clay County (Swenk, op. cit.). Additional records of the distribution of this mustelid in Nebraska are: Hastings, Adams County, 1 (HM); Schuyler, Colfax County, 1 (NGFPC);