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OK, I have had a quick look at Stephen's specimen this morning and I have to agree that the distinction between male seperata and multispina is a little 'marginal'.

The tuft of hairs (short and fairly dense) and the tergite dusting (very sparse and vanishing dorsally) lean towards seperata but I wouldn't call the calyptrae 'dark brown', except for a small patch where it joins the body.

So, in the absence of a determined M.multispina we'll call it M.seperata, as Theo suggested. :)