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I can add some information that might help. I figured out that at least eight specimens of E. manchurica where collected at the same locality in the period of 1941-1950 by the same collector V. N. Alin. This material is not in best condition and was not examined by Rozkosny & Knutson but shows all the same wing colouration as your specimen. So it is quite possible that it belongs to manchurica as well. There is an additional species with bare prosternum, the same wing pattern but distinct ventral setae on front femur, and different genitalia from the same locality represented in five specimens.

Regards

Piet