Thysanoplusia intermixta Warren, 1913. In orichalcea the end of the brass band towards the wing base is more wedged shape, more rounded in intermixta. In orichalcea, the position of the orbicular stigma is positioned mid way below the bottom portion of the greenish-golden finger. 

Diagnosis (Vide MOB). The pale lustrous green areas of the forewings are distinctive except for possible confusion with a congener, intermixta Warren (below), which occurs sympatrically with orichalcea throughout the Oriental tropics to Java but has not yet been recorded from Borneo. T. intermixta has a forewing green area of somewhat yellower tone, crossed by a more distinct irregular submarginal; the green area extends slightly less basad and is basally more blunt; the hindwings are paler, more yellowish.