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Hi Susan Hard to use the key which early on relies on minute characters especially the presence of setulae on the underside of the radiocubital node (no glossary entry yet - a closeup photo would be great). However comparison with specimens in the collection here in Belfast (checked by Adrian Pont and Fonseca years back) indicates this may well be Helina duplicata (Meigen, 1826) a common species here and with you too. If you have a specimen I'll take a look at it or guide you through the key. How did you get it to Helina by the way? This is terrific progress.They are not easy without help in the early stages. Robert
Hint:p if you have Fonseca (RESL Handbook) :p:p take duplicata through the key backwards.

As was the case with Nikita's Pegomyia (gallery) this is well worth chasing up as reliably identified .... Am I repeating myself? Good galery candidate once the id is firmed up.