The adults are 7 to10 millimetres long. The prominent eyes and the legs are reddish brown. The brown or yellowish antennae are forward-pointing, with a hairy 3rd segment and a whitish arista. The dark grey wings are mottled by many greyish spots and with a blackish border.
Often found in damp areas. It may also be encountered in grasslands and woodlands, feeding on nectar or sipping dew.
When to see it
Late May until September or October peaking in August.
Larvae prey on terrestrial snails.
Widespread and fairly frequent in the southern half of Britain, but possibly mainly coastal in Wales and scarce north of Cumbria….Naturespot
A common medium-sized hoverfly, often found in gardens, the Narcissus Fly (also known as the ‘Greater Bulb Fly’) is a bumblebee mimic. Adults feed on nectar and pollen and can be seen around flowers like dandelions from March to August. Males can be spotted flying low over short grass in search of females. While females can be seen on the dying leaves of bulbous plants, such as Daffodils, Narcissi and Bluebells, where they lay their eggs. The larvae hatch and burrow into the bulb underground, feeding on it and even destroying it.
Covered in ginger hairs, with a black band around the middle and creamy tail, the Narcissus Fly is one of several species of bumblebee-mimic hoverflies. Common around Daffodils and Bluebells.
The adults grow up to 8–10 millimetres (0.31–0.39 in) long and can mostly be encountered from April through August in moist forests and meadows, feeding on nectar of flowers .
Their body is elongated, the thorax is metallic green, the head is hemispherical without hair, while the eyes are quite hairy. Antennae are short, the first antennal segment is longer than the second. The legs are black, only the knees are yellow. The abdomen is flattened and broad, blue-green in females, with a copper-green sheen in males. The wings are yellowish-brown.
The larvae develop in humus-rich soil, feeding on dead leaves and other decaying vegetal substances.