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