Species name
Koyaga numisma (Staudinger, 1888) キモンコヤガ
Taxonomy  Erastria numisma Staudinger, 1888, Stettin. ent. Ztg 49: 265 (TL: RFE, Primorye terr., Vladivostok ["Wladiwostok"], Askold Isl., bassin Razdolnaya river [Suifun] [MNHU, Berlin])
Erastria olivacea Leech, 1889, Proc. Zool. Soc. Lond. 1889: 526, pl. 53: 1 (TL: Japan,, Oiwake; Korea: Wonsan [Gensan], "Chang-yang" [BMNH, London])
Geographical range Far East Russia, Korea, Japan (Hokkaido, Honshu, Shikoku, Kyushu, Yakushima)
沿海州, 朝鮮半島、日本に分布. 北海道から九州に至る本土域と屋久島に産する.
Distribution map 
Biology 幼生期は不詳.
Flying season 5-8月に出現.
Remark

前翅はオリーブ色を帯び, 翅底から中脈に沿い淡色条が貫く. 環状紋は明瞭, 白色を帯びた楔状紋を表す.

Japan
Hokkaido
Japan
Hokkaido
Japan
Hokkaido
Female genitalia 
References  Y. Kishida (E.d.), 2011, The Standard of Mothss in Japan II: 285
VS Kononenko, S.B. Alm, L. Ronkay, 1998, Illustrated Catalogue of Noctuidae in Korea,161