Tasa Wesołowska, 1981 is a small chrysilline genus distributed in East Asia, with two currently known species: T. davidi (Schenkel, 1963) and T. nipponica Bohdanowicz & Prószyński, 1987, both species having been recorded in China.The combination Tasa koreana (Wesołowska, 1981) comb. rev. is re-validated, based on the characteristics of the copulatory organs of both sexes. A re-description and diagnostic photographs are also provided.