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Nikita, Andrzej, thanks for your help with this fly!

Andrzej, how does one determine this fly is a female?

I must confess I find the information about Scoliocentra and Amoebaleria confusing. So this is a case where experts disagree how to arrange the genera in Heleomyzidae, and which species to include in each genus?

I see at Nearctica.com these three entries listed for Scioliocentra in North America:

Scoliocentra fraterna Loew 1863 (Scoliocentra)
Scoliocentra thoracica Collin 1935 (Scoliocentra)
Scoliocentra tincta Walker 1849 (Helomyza)

And these are listed for genus Amoebaleria:

Amoebaleria caesia Meigen 1830 (Helomyza)
Amoebaleria confusa Wahlgren 1918 (Helomyza)
Amoebaleria defessa Osten Sacken 1877 (Blepharoptera)
Amoebaleria flavotestacea Zetterstedt 1838 (Helomyza)
Amoebaleria glauca Aldrich 1908 (Leria)
Amoebaleria gonea Garrett 1925 (Amoebaleria)
Amoebaleria helvola Loew 1862 (Scoliocentra)
Amoebaleria infuscata Gill 1962 (Amoebaleria)
Amoebaleria perplexa Garrett 1924 (Amoebaleria)
Amoebaleria sabroskyi Gill 1962 (Amoebaleria)
Amoebaleria sackeni Garrett 1925 (Amoebaleria)
Amoebaleria scutellata Garrett 1921 (Amoebaleria)
Amoebaleria spectabilis Loew 1862 (Blepharoptera)
Amoebaleria triangulata Garrett 1925 (Amoebaleria)
Amoebaleria tularensis Gill 1962 (Amoebaleria)

So Andrzej, you are saying that under Gill's 1962 revision, this fly would likely be included in Amoebaleria, and it may be A. helvola?