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Species Condylostylus patibulatus

Long-legged Fly - Condylostylus patibulatus Condylostylus patibulatus - male Longlegged Fly - Condylostylus patibulatus Long-legged fly - Condylostylus patibulatus Longlegged Flies Condylostylus patibulatus  - Condylostylus patibulatus - female Dolichopodidae - Longlegged Flies - Condylostylus patibulatus Condylostylus patibulatus 3022365 LLF - Condylostylus patibulatus - female
Classification
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
Identification
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
Range
Eastern USA, Southern Canada
Remarks
This is the only species of the C. patibulatus group found eastward of Texas.
Internet References