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Hi Stephen, Just looking at it again, I can't be certain unless I see the genitalia. Oxycera is correct it would be a leap of faith! but its not C. crassicornis as M2 does not reach wing margin. Palpal segments are darkened so it is definitely not C.flaviceps, C.fasciata or C.parvipalpus that has yellowish brown palpal segments. The stem of M fork is more than 2.5 times as long as rm so it isn't C. fusca. I don't think it's nitidula as the CU fork base is slightly before the M fork. . C. semiflava males have 13 antennal flagellomeres whilst the females have 9. That leaves pusilla, murina, insons, fissa and pseudomurina. It gets a bit hazy after this in all honesty and making clearcut distinctions is based on visual which is inconsistent depending on lighting etc. I think Oxycera will agree, Apologies.:) :)