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I didn't see any syrphids for many weeks, not even E. tenax as last year. We had some cold days in november. Today I saw the first one this year, a Episyrphus balteatus a male. Warm Wind -> 7?C at Lake Thun. Switzerland. No Photo.
There is much Hedera around. I searched for flies or pupae, but didn't find any.
Looking forward for spring
Maja