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I am 99% sure of the identification but I just thought I'd sanity-check it with the experts here before I make a complete fool of myself :D These were seen last weekend, attacking Lackey moth larvae on a coastal site called Cogden Beach, in Dorset.

They seem to key very well ... hairy r4+5 plus long, converging sub-apical scutellars leading to Siphonini; then a weak ventral katepisternal bristle, lack of hinged proboscis and many anterodorsal bristles on the mid tibia leading to Goniocera :)





Apologies for the size of the images - though I think they should scale OK on most computers. Finally here is a brief and quite bad-quality video of them chasing the host larvae and being chased off ;)

http://youtu.be/T...