Byasa daemonius

{{Short description|Species of butterfly}}

{{Speciesbox

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| taxon = Byasa daemonius

| authority = (Alphéraky, 1895)

| synonyms=

• Papilio daemonius Alphéraky, 1895{{cite web |last=Savela |first=Markku |url=http://ftp.funet.fi/pub/sci/bio/life/insecta/lepidoptera/ditrysia/papilionoidea/papilionidae/papilioninae/atrophaneura/#daemonius |title=Atrophaneura daemonius (Alphéraky, 1895) |website=Lepidoptera and Some Other Life Forms |accessdate=6 December 2017}}
• Atrophaneura daemonius (Alphéraky, 1895)
• Papilio alcinous plutonius ab. fatuus Rothschild, 1895
• Papilio daemonius var. yunnana Oberthür, 1907

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Byasa daemonius{{cite web |url=http://www.insects-online.de/frames/papilio.htm |title=Papilionidae – revised GloBIS/GART species checklist (2nd draft) |author1=Häuser, Christoph L. |author2=de Jong, Rienk |author3=Lamas, Gerardo |author4=Robbins, Robert K. |author5=Smith, Campbell |author6=Vane-Wright, Richard I. |date=28 July 2005 |work=Entomological Data Information System |publisher=Staatliches Museum für Naturkunde Stuttgart, Germany |accessdate=21 June 2013 |archive-date=9 September 2010 |archive-url=https://web.archive.org/web/20100909141739/http://www.insects-online.de/frames/papilio.htm |url-status=dead }} is a butterfly described by Sergei Alphéraky in 1895. It is found in Tibet and western China, that belongs to the windmills genus Byasa, comprising tailed black swallowtail butterflies with white spots and red submarginal crescents.