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Looking at records for the UK, I can see Pericoma nubila and trivialis and Pneumia as a subgenus of Pericoma, but no Pneumia nubila or P trivialis. Another example of the confused Psychodid taxonomy I suppose...

Am I right in thinking the key characteristic to separate nubila from trivialis would be a microscopic examination of the facial structures?

Thanks again for your help.

Martin