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Van Veen's key is not up-to-date for this genus. There is another species closely related to T. bombylans in Europe: T. angustistriatum. Here in Finland we have only the latter. Both species are quite rare in Scandinavia and at least T. angustistriatum seems to be bound to old aspen (Populus tremula) stands. Unfortunately I do not have any idea how to separate these species, I have to ask our local syrphidae gurus for help. It's not a fulltime job for them: T. angustistriatum is very rare in Finland with only 3-4 known recents records.

Here the only Temnostoma angustistriatum is my collection.