A predicted new Geotrupes from the mountains of Oaxaca, Mexico, and a description of the male of Geotrupes lobatus (Coleoptera: Geotrupidae)

<i>Geotrupes nuntiatus</i> Kohlmann & Arriaga-Jiménez, sp. nov., is described from the Mixteca shield, in the mountains of Oaxaca, Mexico. Its habitat, distribution, and ecology are discussed. The male of <i>Geotrupes lobatus</i> Howden, 1974 is described for the first time. An updated key of the genus for the state of Oaxaca is presented to facilitate identification. Photographs of the specimens, diagnostic features, and their aedeagi, as well as distribution maps, are also included.