Abstract: Renewed interest in the early history of cricetids has developed within the past 15 years, but there is little evidence to support these studies. The systematic position of Simimys from the upper Eocene of North America has long been unsettled. Cricetodon schaubi, a unique Eocene cricetid definite, wag described by Zdansky (1930) only on the basis of -two lower molars. In that case, it is necessary to do further field work for discovery of new material. Fortunately, about two hundred isolated teeth assignable to a new genus were gathered in the Middle-Late Eocene deposits of the Yuanqu Basin by means of screenwashing recently. It seems that the new genus has a close relationship with the known Oligocene cricetids.

摘要： 本文记述了两种中、晚始新世仓鼠类:任村祖仓鼠(Pappocricetodon rencunensis gen.et sp. nov.)和绍氏祖仓鼠(P. schaubi (Zdansky, 1930)).化石分别采自我国中部垣曲盆地河堤组任村段和寨里段。文中探讨了早期仓鼠类的一些进化趋势。通过对比，认为源于亚洲的仓鼠类至少有两次向北美扩散，一次在中始新世，一次在始新世末;大概在“大间隔”前后移往欧洲。