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Blue Sawfly

A dark blue sawfly, probably Arge berberidis (Hymenoptera: Argidae).  Although this specimen was on wild carrot (Daucus carota), the larvae of this species eat the leaves of barberry bushes (Berberis sp) which I seem to remember seeing growing somewhere in the Reading University grounds.

According to this page at the Royal Horticultural Society, A. berberidis is a recent introduction to Britain having been first noticed here in 2002.

Photos taken in Whiteknights Park, Reading, UK, on 2010-08-19.

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