This small sawfly was one of many on a forsythia shrub. It was so thickly coated in pollen that I don't know how it could see as its eyes were also completely covered. Here, it is doing some serious cleaning of its face, but try as it might it seemed unable to remove the pollen which must be particularly sticky. Sawflies, by the way, are NOT flies, but wasps, and they don't sting. This particular species is an introduced sawfly, native to Europe.