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Family Lonchaeidae - Lance Flies

Fly Fly Small Fly - Lonchaea unidentified Diptera Fly Lonchaeidae - Genus Dasiops? Tiny violet irridescent fly. Lonchaeidae (Lance Flies)? teneral fly
Classification
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Diptera (Flies)
No Taxon ("Acalyptratae")
Superfamily Tephritoidea
Family Lonchaeidae (Lance Flies)
Explanation of Names
Lonchaeidae Rondani 1856
Numbers
~120 spp. in 6 genera in our area (72 spp. of Lonchaea and 36 of Dasiops)(1); ~580 spp. in 9 genera total(2)
Identification

ID difference between Fanniidae and Lonchaeidae:
One way is the wing. In Fanniidae Sc and R1 are widely separated and Sc is straight for most of its length. In Lonchaeidae Sc is close to R1, the space between them is often darker, and the wing margin bulges out before the tip of Sc.[Comment by John F. Carr]
Habitat
Most larvae live behind bark of dead trees; some live on decaying fruits or vegetables.
Food
Some feed on bark beetle larvae
Life Cycle
Click on an image to view the life cycle:
Remarks
Mostly saprophagous - the larvae feed on dead or damaged plants, although some also feed on live, healthy plants. Several species of lonchaeids form swarms near or above trees, hovering and milling around in the air. This behavior is common in several families of flies (midges, black flies, dance flies, etc.), but lonchaeids are one of the few groups of "higher" flies (calyptrates and acalyptrates) that do it. (Comment by Terry Wheeler)
Some can be considered beneficial