Lethe gemina, Tytler's treebrown, is a species of Satyrinae butterfly found in the Indomalayan realm (West China, Naga Hills and, as subspecies zaitha Fruhstorfer, 1914, Taiwan)"Lethe Hübner, " at Markku Savela's Lepidoptera and Some Other Life FormsWeymer, G. 1910-1911. 4. Familie: Satyridae. In: Seitz, A. (Ed.), Die Gross-Schmetterlinge der Erde. Stuttgart, A. Kernen. 5: 185-225.
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