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Species Merodon equestris - Narcissus Bulb Fly

Bee to ID - Merodon equestris - female Narcissis Bulb Fly- - Merodon equestris - male Merodon equestris Unknown insect - Merodon equestris HF-2316-2318-2319 - Merodon equestris Fly 8794 & 8707 - Merodon equestris - male   - Merodon equestris - male Bee fly inside my house - Merodon equestris
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Diptera (Flies)
No Taxon ("Aschiza")
Family Syrphidae (Hover Flies)
Subfamily Eristalinae
Tribe Merodontini
Genus Merodon
Species equestris (Narcissus Bulb Fly)
Other Common Names
Large Narcissus Fly, Greater Bulb Fly, Large Bulb Fly
Synonyms and other taxonomic changes
Merodon equestris (Fabricius)
Orig. Comb: Syrphus equestris Fabricius 1794
12-14 mm(1)
Color variable:

eyes meet at the frons in males (below left), separated in females (below right), but the difference is not visible from behind

Wing veins include a pattern that resembles a sock:
native to Europe, adventive and now widespread in North America (wherever daffodils (Narcissus spp. are grown), Japan, and Australasia(1)(2)
mostly: April-July (BG data)
Larvae live in and feed upon plant bulbs; adults nectar widely (BG data)
Life Cycle
overwinters as large maggot(2)
locally important pest of daffodils (Narcissus spp.)(1); accidentally introduced in the US, probably with bulbs