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Family Lonchaeidae - Lance Flies

Fly Dark Metallic Blue Fly Dark Metallic Blue Fly Small Metallic Blue Fly Lance Fly Fly Larvae and fly
Classification
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Class Insecta (Insects)
Order Diptera (Flies)
No Taxon (Acalyptratae)
Superfamily Tephritoidea
Family Lonchaeidae (Lance Flies)
Numbers
Nearctica lists 6 genera with 123 species; 72 species in the genus Loncheae and 36 in Dasiops.
Habitat
Most larvae live behind bark of dead trees; some live on decaying fruits or vegetables.
Food
Some feed on larvae of bark beetles.
Remarks
Some of them even can be considered to be beneficial insects.