Euthalia franciae, the French duke, is a species of nymphalid butterfly found in the Indomalayan realm. Characteristic of the under surface is the delicate blue-green, bronze-like ground-colour which is richly suffused with silver-grey, and on the hindwings adorned with stripes of pale lilac, especially in specimens of the dry-season. The forewing underside with a large quadrate black spot at the anal angle, longitudinal band broad and clearer white.Seitz, A., 1912-1927. Die Indo-Australien Tagfalter. Theclinae, Poritiinae, Hesperiidae. Grossschmetterlinge Erde 9: 799-1107, pls. 138-175.
Subspecies Euthalia franciae franciae (Nepal, Sikkim, Bhutan) Euthalia franciae attenuata (Tytler) (Upper Burma) Euthalia franciae raja (C. & R. Felder, 1859) (Assam, Yunnan)"Euthalia Hübner, " at Markku Savela's Lepidoptera and Some Other Life Forms
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