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Hi,

As Gymnocheta viridis might already be in flight in Central Europe, I'll post this one as a reminder. G. magna is a bit later species, however at least in Finland the flight-times of the two overlap. Latest viridis in my collection is from July 12! The female magna specimen here is ~12 mm, so as big as the biggest viridis. The mouth edge is a good feature distinguishing the two!

Best,

Jaakko