Lethe dura, the scarce lilacfork, is a species of Satyrinae butterfly found in the Indomalayan realm."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.
Subspecies L. d. dura Himalays, West China, Formosa Assam, Burma, Thailand L. d. gammiei (Moore, ) Northwest India, Bhutan, Sikkim L. d. mansonia Fruhstorfer, 1911 Indo China, Vietnam L. d. moupiniensis (Poujade, 1884) West China L. d. neoclides Fruhstorfer, 1909 Taiwan
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