Abstract: The fossil cricetids described in the present paper were obtained from the Middle Eocene of Yuanqu Basin by screen-washing in two field seasons of 1997 and 1998. This discovery not only adds the member of the Eocene faunal list of the Basin but sheds light on the age of the fossil-bearing bed.

摘要： 记述了在垣曲盆地郭家村火石坡地点发现的仓鼠类一新种和一个相似种———垣曲古亚鼠( Palasiomys yuanquensis sp. nov. ) 和垣曲古亚鼠相似种(Palasiomys cf . P. yuanquensis) 。新种以上臼齿前小尖不明显、m1 下前边尖与下原尖相连、个体大等特点区别于属型种锥齿古亚鼠(P. conulus) 。古亚鼠化石在火石坡的发现为垣曲盆地可能存在中始新世伊尔丁曼哈期地层提供了又一证据。