[Syrphidae] Stackelberg 1922

[André van Eck]

Dear all,

I am searching for the following publication:

Stackelberg, A.A. 1922. De Syrphidarum (Diptera) speciebus duabus novis 
e Rossia europea

(description of Liogaster nigricans)

Thank you very much,

André
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