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I think Hollmann-Schirrmacher only set out to monograph Philygria s.s.
In the process, his cladistic analysis suggested that Nostima should be included within Philygria, but he didn't deal with all the Nostima species (probably not having access to semialata among others).
From your description of the venation, they certainly sound like semialata. Collin figured the wings in his paper in The Entomologist - unfortunately don't have a copy here which I can scan for you. Let me know if you'd like a copy after Christmas!