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All Nymphalidae have only 4 fully-functional legs, while Pieridae have 6. Beware of Pierids with broken legs, or not using all for standing on (eg Leucidia, sometimes).
On M. helenor, the white mark in space 3 VFW is a crescent, and the white in the margin VHW is widens apically. On M. achilles, the white mark in space 3 VFW is pointed, and the white in the margin VHW is narrow throughout.