Araschnia burejana (reverse eight-toed butterfly)

Japanese: サカハチチョウ(逆八蝶) - サカハチチョウ（英語表記）Araschnia burejana

An insect of the Nymphalidae family of the Lepidoptera order. A specialty of East Asia. Found throughout Japan, it is somewhat mountainous. Small, with a wingspan of 4-4.5cm, females are slightly larger than males, and have rounded wings. They emerge twice a year, three times in warmer regions. Unusually for Nymphalidae, they overwinter as pupae. The spring type has developed reddish-brown parts on the wings, giving it a similar impression to the leopard butterflies and false fritillaries, but the summer type has a thick white band running across a black-brown background, giving it a different appearance similar to the common fritillary. The Japanese name comes from the fact that the white band on the summer type looks like the reverse of the kanji character for eight.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

鱗翅目タテハチョウ科の昆虫。東アジアの特産。日本全国に産しやや山地性。小型で開張は4～4.5cm，雌は雄よりやや大きく，翅も丸みを帯びる。年2回，暖地では3回の発生。タテハチョウ科には珍しくさなぎで越冬する。春型は翅に赤褐色の部分が発達し，ヒョウモン類，ヒョウモンモドキ類に似た印象を与えるが，夏型は黒褐色の地に太い白帯が走り，イチモンジチョウ的で別種の観がある。和名は夏型の白帯が漢字の八の逆のように見えることに由来する。

出典　株式会社平凡社世界大百科事典第２版について　情報

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