One of these Thereva species, which I have tentatively identifed as Thereva strigata, was conspicuous and active on the boulders pictured here - where I nabbed a few. The irregular surfaces and the activity of the flies made catching them a challenge. Otherwise, I collected the therevids here using malaise traps set out along the hillside and at a locality northeast of Madrid.

Males, like the one in this picture, flew up from the rock surface at incoming flies, but females were also collected from these boulders at lower positions. A macro lens would have been perfect for me at this moment, but I was happy enough to get it in the net a few moments later.

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