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Hi,
Here is a dark Scaeva female from Austria, Tyrol, Niederthai (1.500 m). I'd like it to name it S. pyrastri var. unicolor (see http://www.dipter...ead_id=126), but I am not fully convinced... S. pyrastri has white, oblique markings, but here the rather straight markings might have been basically yellow as in S. selenitica. The margins of the last tergites are yellow, too, and in the middle of the hind tibiae there is a dark ring like in S. selenitica. However, the dark sternite markings are square and broader than high, which fits S. pyrastri. Can we make a decision between the two species in this case?
Many thanks for help, Sundew