Some new information on the genus Lethe Hübner, 1819 from Nujiang (upper Salween) valley, western Yunnan is provided. Lethe laodamia Leech, 1891 is recorded from this area for the first time, which turned out to be a new subspecies and described herein, viz. L. laodamia murasameae S.-Y. Huang & Lang ssp. n. Little known Lethe liae Huang, 2002 is rediscovered, and its relationship with its allied taxa is discussed. Adults and male genitalia of the aforementioned and related taxa are illustrated.