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The Apatemyidae are a unique radiation of insectivorous mammals known from the Paleogene of North America, Europe, and India. Apatemyids are rare components of the faunas where they are found, and small sample sizes create difficulties in interpreting variation and establishing meaningful taxonomy. Despite disagreement regarding the number of genera and species, there is agreement that two apatemyid genera exist sequentially during the Eocene in North America. The genus Apatemys appears during the Wasatchian and persists through the Duchesnean, followed by Sinclairella, which persists from the Duchesnean through the Arikareean. Here, we describe apatemyid specimens collected from three sites in Sioux County, Nebraska, during field seasons from 2011–2016. All three localities include specimens of Sinclairella dakotensis, nearly doubling the number of known specimens of Sinclairella from Nebraska. In addition, one of these localities, the Whitehead Creek locality, includes two upper molars of a second apatemyid taxon that we assign to the genus Apatemys. Reevaluation of the apatemyid sample from the temporally and geographically proximate Raben Ranch locality suggests that one m1, previously assigned to Sinclairella, belongs to the same species of Apatemys represented at Whitehead Creek. When taken in conjunction with a single M2 from Chadronian-age deposits of the Cypress Hills Formation, Saskatchewan, these new specimens indicate that at least two species of Apatemys persist into the late Eocene of the Great Plains Faunal Province. Moreover, they add to a growing list of taxa that persist as relicts in the Chadronian of the Great Plains after extinction elsewhere. Matthew A. Tornow. Department of Anthropology, Saint Cloud State University, 720 4th Avenue South, Saint Cloud, Minnesota 56301, USA. matornow@stcloudstate.edu Tafline C. Arbor. Division of Biomedical Sciences, Marian University College of Osteopathic Medicine, 3200 Cold Spring Road, Indianapolis, Indiana 46222, USA. tarbor@marian.edu

Apatemyids (Mammalia, Apatotheria) from the middle Chadronian (late Eocene) of Sioux County, Nebraska, US