The Microtine Rodents of the Mullen Assemblage from the Pleistocene of North Central Nebraska

The University of Nebraska State Museum has had an active collecting program in Hooker and Cherry counties, Nebraska, since the 1930\u27s. The following University of Nebraska State Museum collecting localities have been extensively excavated: Cr-10, Cr-102, Cr-11, Ho-101, Ho-102, and Ho-103. These localities have produced a large vertebrate fauna described by Jakway as the Mullen Local Fauna which he considered for the most part to be Early lllinoian. Further study of this local fauna now demonstrates that assemblage does include Early as well as Middle Pleistocene animals. The purpose of this paper is to report on the evidence regarding the microtine rodents of this assemblage. New species of Ploiophenacomys and Mimomys are described. Pliopotamys meadensis and Ondatra idahoensis are reported from this assemblage for the first time