The genus Xenanastatus Bouek (Hymenoptera: Eupelmidae) is recorded for the first time in China based on a newly described species, X. imbricatius Wu & Peng sp. nov. The new species is described and illustrated based on females from Guangdong province; internal transcribed spacer 2 (ITS2) and partial mitochondrial cytochrome oxidase subunit I (COI) and 28S ribosomal DNA (28S) sequences are provided. The world species of Xenanastatus are differentiated in a key based on females.