Posted: 13/09/2014 at 00:41
In fact this paper lists them as both being members of the Symphyta, which is presumably a suborder of the Hymenoptera.
Tbh I've never heard of this lot, other than the goosberry one; my original comment was a guess!
If they are sawflies they will pupate in the soil after dropping off the leaves. If you cut the canes down as soon as they die off instead of waiting till February, and stir up the surface of the soil a bit (gently cos the roots are shallow) you'll probably expose some of the little beggars and provide some winter bird food. And delay mulching next spring for the same reason. (A guess - or perhaps extrapolation from what you do on gooseberries).
If they reappear next year (or indeed are still active now) you might try spraying with garlic emulsion, or simply water - might discourage them.