The genus Nagiella was studied using morphological and DNA barcode data. Nagiella bispina sp. nov. is described as a new species, and N. hortulatoides Munroe is recorded in China for the first time. The diagnosis of this genus is revised, and the genitalia description of N. quadrimaculalis (Kollar and Redtenbacher) and N. inferior (Hampson) are given in English for the first time. Nosophora incomitata (Swinhoe) stat. rev. is removed from the synonym of N. quadrimaculalis. Photographs of the habitus and genitalia as well as COI DNA Barcode data of these four species are provided.
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