Bassarona durga, the blue duke,"Bassarona Moore, " at Markku Savela's Lepidoptera and Some Other Life Forms is a species of nymphalid butterfly found in the Himalayas.
Description Euthalia durga resembles Euthalia duda, but is much rarer; on the forewing the white median band is broader, the subapical spots smaller, on the hindwing the median area steeper and distally dentate. Under surface chiefly blue instead of yellowish-green, the distal portion of both wings nearly grey-black.Seitz, A., 1912-1927. Die Indo-Australien Tagfalter. Theclinae, Poritiinae, Hesperiidae. Grossschmetterlinge Erde 9: 799-1107, pls. 138-175.
Range It is found in Sikkim, Abor Hills and Nagaland. In June 2022, it was declared as the State Butterfly of Sikkim.
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