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Dear Piet, thank you for this rare paper.
As for the case, it is not easy still after your kind help.
I collected on the corner of Russia, China and N Korea the series of about 4 males and 6 females of Elgiva I had never seen before. It has an unusual wing pattern, so my best guess was E. manchurica. But according to Rozkosny and Knutson decription wings in E. manchurica is rather usual.
I have to add that there are questions with E. divisa. Personally I had never collected it. What's more, if one trys Forum Search here: there is no one post (!!!) with E. divisa during 10 years. (And E. divisa is a species distributed from W Europe to Kamchtka according to Rozkosny!
So, it requires some calm thinking when I'll be back in Moscow...