Synchroa medogensis, a new species of Synchroidae Lacordaire, 1859, is described and illustrated, based on a single male collected from Mêdog, Xizang, China. This new species is close to S. elongatula Nikitsky, 1999 and S. melanotoides Lewis, 1895, but could be distinguished by the elongated antennae and elytra, the apically narrowed prosternal process and the stout parameres.The new information of this new species provided in this paper include: description, type information, distribution and comparison amongst S. medogensis sp. nov., S. elongatula and S. melanotoides.