MORPHOLOGY
External characteristics
Male
Wingspan (mm): 62 - 78 (DBpedia, n.d.).
Hindwings The hindwing underside has a black-ish brown colouration in the distal area and the proximal area is yellow coloured (Pequin, 2021).
Female
The females generally have a different underside wing surface than the males, by being darker with broader margins on both wings (D'Abrera, 1982).
Subspecies and variation
Two subspecies are described. The forewing underside of ssp. echo has a larger white area and only small subapical spots (Pequin, 2021).