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from my litle experience I saw that E.corollae can be easy confused with E.luniger (I am refering mostly at females). A far as I know E. corollae doesn't have black hairs on the scutellum.but now when I looked again at your photo and I compare with other pictures from the site, I am not relly convinced that it is E. corollae. It seems that corollae has the spots on the tergites reaching the margins.
And in your picture I didn't see the black hairs, but I looked again and I didn't see that the spots reach the margins.
Take a look yourselfand let me know your opinion.
best wishes, Amalia