perognathus

Century Dictionary and Cyclopedia

1. n. The typical genus of the subfamily Perognathinæ, having an upright antitragal lobe of the ear and the soles nearly naked. There are several species, as the tuft-tailed pocketmouse, P. penicillatus, and the fasciated, P. fasciatus, inhabiting the United states west of the Mississippi. They resemble mice, but have external cheek-pouches.

WordNet 3.0

1. n. pocket mice