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- Cambridge, (l) 21 Jul 2001, (r) 26 Jun 2002.
- Checklist: 59.031
- Seen here the two summer forms, f. hutchinsoni (left), lighter in colour, which emerges early in summer and produces a second generation; and the normal darker form (right)
- Larval foodplant: nettle, hop, elm.
- The undersurface (seen in the defensive posture adopted after a wasp flew past) shows the white mark which gives rise to its English and Latin names.
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