Lethe insana, the common forester, 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. The larva feeds on Arundinaria falcata
Subspecies L. i. insana Northwest India, Bhutan, Sikkim, Nepal, Assam to Indo China L. i. procris Leech, 1891 Thailand, Laos, Vietnam L. i. formosana Fruhstorfer, 1908 Taiwan L. i. brisanda de Nicéville, 1886 Bhutan, Assam, Northeast Burma L. i. baucis Leech, 1891 West China, Central China
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