A new genus of malachiine Melyridae, Platyintybiagen. nov., is described based on several male-specific characters, along with description of its type species, Platyintybia zhongshanensissp. nov., from China. A new combination, Platyintybia sarawakensis (Champion, 1921), comb. nov., is proposed after examining the type specimen; this species is newly recorded from China. A key to the genera of Chinese Apalochrini is provided for the first time.

A new stag beetle fossil is described from the Yixian Formation in northeastern China. A new genus is established based on this well-preserved specimen. Prolucanus beipiaoensis gen. et sp. nov. is firmly placed in the extant lucanid subfamily Lucaninae based on its broad prosternal process and geniculate antennae. Our discovery represents the first fossil record of Lucaninae from the Late Mesozoic of China and the oldest reliable record belonging to the subfamily. We also summarize the fossil species of stag beetles found in China and the described fossil species of the subfamily Lucaninae found in the world. A key to all fossil genera of Lucanidae from China is provided.

In this paper, the subgenus Thailandia Bílý, 1990 of the genus Anthaxia Eschscholtz, 1829 from China is reported, including two species: A. (T.) svatoplukbilyi Qi & Song, sp. nov. from Guangxi and A. (T.) rondoni Baudon, 1962 from Yunnan. The description and illustrations of the new species are provided, the illustrations and information of A. (T.) rondoni from Yunnan are given for the first time, and the diagnostic characters are provided to distinguish the new species from other related species.

A new species Coomaniella (Coomaniella) dentatasp. nov.from Guangxi Province, China, is described and placed in the C. (C.) chinensis species-group. The variability is discussed, and a new adult host plant is recorded. New distributional records are given forC. biformissimaJendek & Kalashian, 1999 andC. lingafelteriJendek & Pham, 2013.

In this study, a new stag beetle of the genus Dorcus MacLeay, 1819 is described and illustrated, namely Dorcus liyuani Qi & Zhan, new species, from Gansu Province, northwestern China. The new species is very similar to its related species, especially D. tianlongi Wang & Zhou, 2019 and D. liyingbingi Huang & Chen, 2013, in external characters, but can be clearly distinguished by male genital features. There is also a clear geographical isolation between the new species and the closely related species.