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Andrzej, Kahis, Ruud, Thanks very much for the good work on this ID!

I see that my usual reference for which species live in North America, nearctica.com, lists these Suilla species:

Suillia apicalis Loew 1862 (Helomyza)
Suillia barberi Darlington 1908 (Helomyza)
Suillia convergens Walker 1849 (Dryomyza)
Suillia longipennis Loew 1862 (Helomyza)
Suillia nemorum Meigen 1830 (Helomyza)
Suillia plumata Loew 1862 (Helomyza)
Suillia quinquepunctata Say 1823 (Helomyza)
Suillia sororcula Czerny 1926 (Suillia)

This website is the web version of the print publication Nomina Insecta Nearctica.