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btw, interesing that Collin mentions that it is as variable as lutea. Sometimes I am quite convinced to have some other species than lutea in front of me, but then it is just a very dark variation or a very, very light one.
First I look at the 2nd tibiae. Then to the scutellum, thirdly to the antennae. When I see no bristle on the 2nd tibiae, the scutellum is not black and the antennae are dark, I draw the conclusion that it is lutea. But perhaps dangerous when you are in an area where also bifurcata is common.