54a. Byasa impediens impediens (Seitz, 1906)

[ Papilio alcinous] imperius Rothsch. Fruhstorfer, 1901; Soc. ent., 16 (15): 113. [ISS]

Distribution: found in S. and S.E. Yunnan; also found in Guangxi, Sichuan, to Shaanxi in China.