A new species group, Hesperus babai group, is proposed based on characters of the subserrate antennae and apical portion of median lobe hatchet-like, along with description of a new species: H. pengi sp. n. (Hainan). A new species of the Hesperus borneensis group is described: H. flexibilis sp. n. (Xizang). Hesperus birmanus Cameron, 1932 is newly recorded from China (Yunnan, Hainan). Habitus and diagnostic characteristics of all mentioned species are provided. A key to Chinese species of the borneensis group and babai group are also provided.
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CAI et al. (2024) studied this question.
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