Two new species of the tribe Synanthedonini are described from Taiwan: Synanthedon auritinctaoidis sp. nov. and Paranthrenella helvola sp. nov. Diagnostic characters for the two species are presented using body color, wing pattern, and genitalia. New records of the relationships between host plants and the immatures are also provided. S. auritinctaoidis feeds in the trunk of Cinnamomum camphora (Lauraceae) and P. helvola in callus tissue of Helicia formosana (Proteaceae) or Prunus campanulata (Rosaceae).
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