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I think I have some specimens of Sphegina sibirica from Breconshire, Wales, but there seems to be some inconsistency in the literature. Stubbs & Falk 2nd edition says the chitinous plate behind the hind coxae is incomplete, and the face is yellowish. But van Veen's 2004 book says the face is black, and if I have interpreted it correctly his fig. 733 shows the chitinous plate has no gap in it. My specimens fit van Veen's version. Is it just a variable species? Any comments, please?

John Bratton, Menai Bridge