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Hi Gerard
Can you tell me what evidence there is that this species hibernates as adults? I have seen Eristalis tenax and Eristalinus aeneus hibernating in buildings and caves, but I have never seen an Episyrphus hibernating - only flying aound or sitting on vegetation. I had always assumed that November and December individuals were active (often on Hedera blossom) through the autumn, and that individuals in March had emerged from overwintering pupae. Has anyone seen individuals or aggregations of Episyrphus actually hibernating in sheltered situations like Eristalis does?