Systematic descriptions 29

Eight rodent species from the Upper Oligocene of Pareja are described. The Therido-myidae are represented by Issiodoromys minor and Archaeomys (A.) gervaisi and the Eomyidae by Eomys cf. molassicus. Four cricetid species are described: Heterocrice-todon landroveri sp. nov., Eucricetodon margaritae sp. nov., Eucricetodon cf. atavus, and Eucricetodon sp. One new glirid species, Gliravus caracensis, is recognized. The fauna of Pareja is considered to be somewhat older than that of Carrascosa del Campo, an