The crow butterflies are members of the subfamily Danainae (milkweed butterflies) of the family Nymphalidae (brush-footed butterflies). The milkweed butterflies are split into the tribes of Euploeini, of which there are five species in Taiwan, and Danaini, of which Taiwan has eight species (see chart, p. 37).
紫斑蝶屬於蝴蝶 5 大家族中「蛺蝶科」下的斑蝶亞科，又分為「紫斑蝶族」和「青斑蝶族」等二個家族，下面又分別有 5 種紫斑蝶和 8 種青斑蝶（表見 34 頁）。