=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); Goehner, Seward County, 1 (NSM); 10 mi. S of Ord, Valley County, 1 (NGFPC). The last mentioned specimen, a skull only, was obtained from a pellet of an unidentified raptorial bird. LITERATURE CITED BAILEY, V. 1900. Revision of American voles of the genus Microtus. N. Amer. Fauna, 17:1-88, June 6. BAIRD, S. F. 1858. Explorations and surveys for a railroad route from the Mississippi River to the Pacific Ocean. War Department. 8 (Mammals, Part 1): xxxii + 757, July 14.