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I seem to have forgotten what little I taught myself a few years ago about identifying species such as this, so any help would be appreciated. Thanks.

It was photographed in Yegen, Sierra Nevada, Spain on 19 April. It was on a willow tree with a lot of aphids and a variety of aphid predators.

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Anthomyiidae (female).

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Thanks. I wondered if it was but descrfiptions always talk about the anal vein which I can never see.