Diapause pupal color diphenism induced by temperature and humidity conditions in Byasa alcinous (Lepidoptera: Papilionidae)

► It is thought that the diapause pupal color of Byasa alcinous consists of a monochromatic color of light-brown. ► We examined the effect of temperature and humidity on the diapause pupal color of B. alcinous. ► A diapause pupal color comprising yellow (or brown) types was induced by high (or low) temperature and high (or low) humidity as environmental cues. ► Diapause pupae of B. alcinous exhibit pupal color diphenism involving brown and yellow types, and not a monochromatic color.