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I presume this is a Stevenia - but which one ?
- following Cerretti: R4+5 setose about halway to r-m: umbratica
- following Zeegers: T2 and T3 with discals as well as marginals: atramentaria
- not sure what to say of the hairs on the arista
From indoors in Belgium (Leuven, 12/3/2002).
Joris