The Genus Betapsestis was established by Matsumura in 1921, based on B. takeuchii from Honshu in Japan. It belongs to the subfamily Thyatirinae in the family Drepanidae, which is distributed in the Palaearctic and Oriental regions (Laszlo et al. 2007; Matsumura 1921). Only two species, B. umbrosa (Wileman, 1911) and B. brevis (Leech, 1900), have been known to date. Among them, B. brevis is endemic to China (Shaanxi, Sichuan, and Yunan), and B. umbrosa is endemic to Japan (Hokkaido, Honshu, Shikoku, and Kyushu), respectively (Laszlo et al. 2007; Matsumura 1921; Zhao 2004; Zhuang 2017). In this ...