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c. 4mm, Clitheroe UK, 6 June 2012

I see these every year, and in http://www.dipter...d_id=31687 we debated between M. separata/multispina. That specimen ended up in Chris's collection as M. separata. Checking this year's model in the European key, I can't help arriving at multispina again. The length of the tuft (just over 1/3 of T5), the distribution of the hairs just as in the diagram and the presence (albeit only laterally) of a distinct band of strong fore-marginal dusting all seem to point the same way. On this specimen the surstyli happen to be exserted, but I have no drawings to tell if this helps. Thoughts?