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For Insects, Spiders & Their Kin
For the United States & Canada
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Species Condylostylus patibulatus

Longlegged Flies (Dolichopodidae) - Condylostylus patibulatus Tiny metallic green fly - Condylostylus patibulatus Is this a Long-legged Fly? - Condylostylus patibulatus - female Longlegged Fly - Condylostylus patibulatus fly?  - Condylostylus patibulatus - female Diptera - Condylostylus patibulatus Possibly Toxomerus? - Condylostylus patibulatus 3022365 LLF - Condylostylus patibulatus - female
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Diptera (Flies)
No Taxon (Orthorrhapha)
Superfamily Empidoidea
Family Dolichopodidae (Longlegged Flies)
Subfamily Sciapodinae
Genus Condylostylus
Species patibulatus (Condylostylus patibulatus)
Synonyms and other taxonomic changes
Dolichopus patibulatus Say 1823
Psilopus patibulatus
Condylostylus patibulatus
Wings usually with a U-shaped marking
Anterior crossband at least as thick as posterior crossband (distinctive when visible)
Legs are usually entirely dark, rarely fore tibiae can be dark brown
Face with hair on the upper and lower halves

If the wings are unmarked, check the leg chaetotaxy - if there are no long bristles as seen in C. mundus females, C. patibulatus is a safe bet
Eastern USA, Southern Canada
This is the only species of the C. patibulatus group found eastward of Texas.
Internet References