Byasa alcinous alcinous
 
Byasa alcinous, the Chinese windmill, is a butterfly of the family. Papilionidae Byasa alcinous has a wingspan reaching about 9–10 centimetres (3.5–3.9 in). The basic colour of the wings is black or dark brown. The hindwings have long tails and a chain of red spots at the edges. The thorax and the abdomen are mainly black on the upperside and the underside, with several black spots, while the other areas are red. Adults are on wing from May to August in two generations.
The larvae feed on Aristolochia species including A. mandshhuriensis, A. debilis and A. manchuriensis. Subspecies has been recorded on A. shimadai, A. liukiuensis, A. kankauensis, A. elegans, A. debilis, A. kaempferii, A. onoei, A. tagala, Cocculus trilobus and Metaplexis chinensis. The species overwinters as a pupa.
This species can be found in the Asian part of the Palaearctic ecozone and partially in the Indomalaya ecozone, from Bhutan, and eastern China to the southern Ussuri region, Korea and Japan. Atrophaneura alcinous, also called Chinese Windmill is a butterfly from the Palaearctic ecozone (Asia). The first description was in 1836 by Klug. The wingspan is about 9 – 10 cm. This butterfly is a member of the family PAPILIONIDAE. Atrophaneura alcinous is black. It has yellow or red spots on its hind wings. The underside of the body has yellow or red hairs. The female is dark-brown or black.