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A sawfly larva (Pristiphora)

Observed: 8th July 2013 By: ThistleThistle’s reputation in InvertebratesThistle’s reputation in InvertebratesThistle’s reputation in InvertebratesThistle’s reputation in Invertebrates
a sawfly larva (Pristiphora)
Description:

A sawfly larva ... but which one? I thought that the brown head and lack of black spots should make this one fairly easy to identify but I've not been able to find it. On Birch.
Edit: Changed to match Martin's ID. Many thanks.

Identifications
Species interactions

No interactions present.