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it is on does not look like berberis. There are several other dark blueblack Arge.
Certainly wasn't on Breberis, though it appeared to be basking rather than doing anything necessarily plant-specific. Have been learning the Athalia spp, but Arge are still on the 'to do' list...
Lat/Lng: 50.9, -1.4
OS grid ref: SU4619