Hoverfly. Coloured scanning electron micrograph (SEM) of Rhingia campestris. Rhingia is a genus of hoverflies. They all have a very distinctive long snout. The long snout protects its rod-like proboscis which is exceptionally long for a hoverfly. It enables it to reach into deeper flowers than other nectar-feeding flies can. Flowers may be pollinated by feeding hoverflies. Its large compound eyes are red. Hoverflies are so named for their ability to hover in the air by beating their wings rapidly. This is usually done to allow them to feed on flowers without alighting. Magnification: x10 when printed 10 centimetres wide.