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Hi Jürgen, thank you for the enquiry! I agree, arcuata is resembling notha and brevicornios and it's difficult to identify if the abdomen is not visible dorsally. Even then it's hardly possible to identify from a photo. Due to the fact that arcuata flies quite early in the year, it's better to take it for T. notha.

In Anbetracht der späten Flugzeit sollte man wohl Tenthredo cf. notha annehmen.

Greetings, Eric