(Figs. 4–7, 9, 12, 15, 17, 18)
Thalpophila digna Butler, 1881, Transactions of the Entomological. Society of London, 1881: 176 (Type-locality: Japan: Yokohama).
= Acronycta michael Oberthür, 1884, Études d'entomologie 10: 18, pl. 2, fig. 13 (Type locality: [Russian Far East, Primorye reg.] Sidemi).
= Sidemia hoenei Matsumura, 1926, Insecta Matsumurana 1: 55, pl. 1, fig. 7 (Type locality: [Japan] Honshu, Asama).
= Acronycta agnata Draudt, 1937, Entomologische Rundschau 54 (30–32): 397, Pl. IV, fig. 3d (Type locality: reported: " In kleiner Anzahl vom Hoeng-Shan (Prov. Hunan), Anfang Mitte April 1935 "), syn. rev.
Type material examined. Holotype of Thalpophila digna (Fig. 4): ♂, handwritten label “ Japan, Yokohama, H. Piyer,
81–94” / handwritten label “ Thalpophila digna Butler Type” / printed label with QR-code "NHMUK010354632" /
printed round white label with red ring "Type" (coll. NHMUK); syntypes of Acronycta michael Oberthür (Fig. 5): 8 ♂,
printed label “Sidemi (Mantschourie), M. Jankowski 1882” / printed label “Typicum Specimen” / printed label “Ex
Oberthür coll. Brit. Mus. 1927–3.” / handwritten label “ Acronycta michael Oberthür (Etud. d'Entomol. X liv. pl. II fig.
13)” (Coll. NHMUK); neotype for Acronycta agnata Draudt (Figs. 6, 12), here designated: ♂, pink printed label
“ Hoengshan, Prov. Hunan, 16.IX.1933. Höne” / White label “Genitalpräp. ZFMK-Nr. [printed] 1850[handwritten]” /
white handwritten label “ agnata ” (Coll. ZFMK).
Other material examined: series of specimens of both sexes from Russian Far East (Amur, Khabarovsk, Primorye Regions), North Korea, Japan (Honshu), China (Sichuan, Shaanxi, Hunan, Guangdong) (Colls. CAV, CGH, NEFU, NHMUK, NMNS, SZMN, ZFMK, ZISP).
Taxonomic note. Draudt (1937) reported the type material of Acronycta agnata: "In kleiner Anzahl vom Hoeng- Shan (Prov. Hunan), Anfang Mitte April 1935.", but there are no specimens with date April 1935 in ZFMK collection. At the same time, the box with specimens determined as agnata in ZFMK collection is supplemented with an additional label " Type verloren" [Type lost]. Obviously, the types of Acronycta agnata, as well as the most part of the collection of M. Draudt, which was located in Darmstadt, Germany, have been destroyed during the Second World War. Because of A. digna and its closest relative A. metaxantha have overlapping geographic ranges in China, the neotype designation is necessary. Here we designate as a neotype the topotype specimen from ZFMK collection determined as agnata (Figs. 6, 12).
Distribution. East Siberia (Transbaikalia, Yakutia), Russian Far East (Amur, Khabarovsk, Primorye Regions). Korea, Japan (Honshu, Shikoku, Kyushu), China (eastern part of Inner Mongolia, Heilongjiang, Jilin, Henan, Shaanxi, Hunan, Hubei, Fujian, Sichuan, Taiwan) (Kononenko et al. 1998; Chen 1999; Han & Kononenko 2010).