Noun | 1. | ![]() mammal genus - a genus of mammals Cricetidae, family Cricetidae - mostly small New World rodents including New World mice and lemmings and voles and hamsters Peromyscus leucopus, vesper mouse, white-footed mouse - American woodland mouse with white feet and underparts deer mouse, Peromyscus maniculatus - brownish New World mouse; most widely distributed member of the genus cactus mouse, Peromyscus eremicus - burrowing mouse of desert areas of southwestern United States cotton mouse, Peromyscus gossypinus - large dark mouse of southeastern United States |