The genus Thambemyia Oldroyd is revised. Five species are recognized. Three new species -T. bisetosa, T. bruneiensis and T. hui -are described, and T. pagdeni Oldroyd, 1956 is redescribed. A new subgenus is founded for one new Japanese species, T. (Prothambemyia) japonica. A key to all known species of the genus is provided. Their distributions are also discussed.
The following two species of the genus Hercostomus from Taiwan are described as new to science: Hercostomus (Hercostomus) siveci sp. nov. and H. (H.) taipeiensis sp. nov. Their relationships with related species are discussed.
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