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Tony, are you sure the first one isn't C. arcuatum (=fasciatum)?

I do often find the lengths of antennal segments very difficult to judge correctly. The ratios apparently depend on gender and size of specimens and wind direction and, well, you get the idea.;) C. arcuatum and C. festivum and the two most common Chrysotoxum at latitude 60 in Scandinavia. But C. elegans has never been found on the Swedish mainland, the only records are from the ?land island where it is very rare and endangered!

Fauna Eur. lists elegans from Finland, but all specimens we have found in collections and checked belong other species (mainly C. arcuatum).