A new genus, Plesioxylion Liu & Beaver gen. nov., is described for Amintinus gambianus Borowski, 2018 from West Africa with a more detailed description and new records of both sexes. We also provide a key to the ten Afrotropical genera in the tribe Xyloperthini Lesne, 1921 as the baseline information for a future study.

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We describe Polycaon sinensis sp. n., the first Asian species of this otherwise American genus, and Melalgus plesiobatillus sp. n., from the same montane locality in China (Zhejiang). The following new synonym is proposed: Melalgus batillus (Lesne) (=Melalgus japonicum Chûjô syn. n.). We comment on the species, Melalgus borneensis (Lesne) sensu Borowski & Węgrzynowicz (2012), and provide a key to the Chinese species of Polycaoninae.