Papilio macilentus is a Papilionidae butterfly found in Japan

Japan

Japan is an island nation in East Asia. Located in the Pacific Ocean, it lies to the east of the Sea of Japan, China, North Korea, South Korea and Russia, stretching from the Sea of Okhotsk in the north to the East China Sea and Taiwan in the south...

, China

China

Chinese civilization may refer to:* China for more general discussion of the country.* Chinese culture* Greater China, the transnational community of ethnic Chinese.* History of China* Sinosphere, the area historically affected by Chinese culture...

 and Korea

Korea

Korea ) is an East Asian geographic region that is currently divided into two separate sovereign states — North Korea and South Korea. Located on the Korean Peninsula, Korea is bordered by the People's Republic of China to the northwest, Russia to the northeast, and is separated from Japan to the...

. It is found in the valleys or the margins of the forest. This species has the longest tail in the family Papilionidae. The spring type is found from April to June, and the summer type from July to August. The larvae feed on citrus. During daytime, females fly low and lay eggs one by one on the leaves of the plants. The species hibernates in the pupal stage. Males have whitish markings in the overlapping part between the fore wings and the hind wings.