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Many thanks for your expert input on this David. I'm always wary of internet IDs, but was interested to find what looked like a visual match for my fly, but could see it differed from your E. capucina images in the gallery.

OK, I'd be happy to upload this image for the gallery as E. pectoralis, giving a link to this thread. I don't have many more shots, as these flies were quite hard to get close to. Three or four were around and trying to feed on some globe thistles, but some aggressive wasps seemed to view the flowers as theirs and kept chasing bombylids off to my frustration! But I found where they were resting on a rock face nearby and managed to get these without falling..

I attach one shot of a different fly, though, slightly more side on. This individual (or maybe the camera angle) shows more brown colour on the abdomen.

Is it possible to sex either of my flies before I post them? Maybe not possible from a photo in this species..?