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A woolly alder sawfly, Eriocampa ovata (Hymenoptera: Tenthredinidae), so-called because its larvae are woolly and live on alder trees.

I photographed another adult at about the same time last year but, at the time, I mistakenly thought it was a Eutomostethus ephippium.   However, the latter have more red down the sides of the thorax, and their antennae are thicker (compare this with this).

Photos taken in Whiteknights Park, Reading University grounds, Reading, UK, on 2010-05-06

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