Per Bugguide: Larvae live in and feed upon plant bulbs; adults nectar widely; locally important pest of daffodils (Narcissus spp.); accidentally introduced in the US, probably with bulbs
Merodon_equestris_Narcissus_Bulb_Fly_May_MMF
Male narcisscus bulb fly (Merodon equestris) in May. Photo © Mary Free