Atrophaneura_mencius
Byasa mencius
Species of butterfly
Byasa mencius[1] is a butterfly from the family Papilionidae (swallowtails). It is found in China. The species was first described by Cajetan Felder and Rudolf Felder in 1862.
The wingspan is 10–11 cm. The wings are dark brown with chain of large red spots on the hindwings. The underside of the body is covered in red hairs.[2]
The larvae feed on Cocullus carolinus.