Alex Hyde / Bog hoverfly (Sericomyia silentis) Strumpshaw Fen, Norfolk, UK, September.

Alan Williams / Hoverfly (Sericomyia silentis) on Knapweed (Centaurea nigra) flower in meadow Cheshire, UK, September.

Alan Williams / Hoverfly (Sericomyia superbens) feeding on Knapweed (Centaurea nigra) at forest edge, North Wales, UK, September.

Alan Williams / Hoverfly (Sericomyia silentis) feeding on Knapweed (Centaurea nigra) fllower on roadside verge, North Wales, UK, August.

Alan Williams / Hoverfly (Sericomyia superbens) feeding on Knapweed (Centaurea nigra) at forest edge, North Wales, UK, September.

Chris Mattison / Hoverfly (Sericomyia lappona) female, covered in pollen, Cumbria, England, UK, May.

Alex Hyde / Hoverfly (Sericomyia silentis) Peak District National Park, Derbyshire, UK. August.

Duncan Mcewan / Hoverfly (Sericomyia silentis) feeding on Spear Thistle. UK

Duncan Mcewan / Hoverfly (Sericomyia silentis) on Bracken frond. UK

Konrad Wothe / Hoverfly (Sericomyia silentis) on flower, Bavaria, Germany

Konrad Wothe / Hoverfly (Sericomyia silentis) resting on Small scabious flower (Scabiosa columbaria), Bavaria, Germany. July.

Chris Mattison / Large hoverfly (Sericomyia lappona) covered in pollen, resting on leaf, Cumbria, England, UK.