[Syrphidae] pdf request: Mallota paper Stackelberg1950

[Frank Van de Meutter]

Dear all,
does anyone have a pdf of the following article by Stackelberg?

Stackelberg, A. A. 1950 Kratkij obzor palearcticeskich vidov roda
Mallota MG. Diptera, Syrphidae). - Entomologiceskoe Obozrenie 31 285-296;
Leningrad.

many thanks & all the best,
Frank
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