Scaeva pyrastri is a relatively large hoverfly with distinctive comma-shaped markings on a black ground on its abdomen which give it its common name of the Pied Hoverfly. Although on the wing in the UK typically from about April to September, they are at heir most numerous during high summer.
Ball and Morris (2105) state that it is a migratory species that arrives in Britain in highly variable numbers from year to year. It is widespread, but scarcer in the uplands.
The specimen shown above is a female as indicated by the widely-spaced eyes.
The Marmalade Fly is the UK’s most common hoverfly
Episyrphus balteatus, also known as the Marmalade Fly or the Marmalade Hoverfly, is found in large numbers throughout the UK . It can be seen in all months of the year, although the peak abundance is in late July.
It is a very variable species with the ground colour depending on the temperature at which the larvae developed. Dark individuals are typically found earlier in the year and are associated with cooler conditions.
Larvae feed on a variety of aphid species, including crop pests such as cereal aphids and Cabbage Aphid. Marmalade Hoverflies are valued by gardeners as the adults help pollinate flowers and food crops.