Abstract
Two new species of the genus Trichrysis Lichtenstein, belonging to the cyanea species group, are described from northeastern Vietnam (Cao Bang Province) and China (Yunnan Province) as new for science: T. sinica Rosa, Nguyen & Wiśniowski, sp. nov., and T. striata Nguyen, Wiśniowski & Rosa, sp. nov. The redescription of T. tonkinensis (Mocsáry, 1914) and additional descriptive characters for T. chamchuensis Wiśniowski & Nguyen, 2020 are provided.
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