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thanks Theo,

yes it's the key to Central Europe (Tschorsnig & Herting) that I refer to in my question, couplets 5-7 for this genus, and figures 193, 194, 188 etc. I'll try and get a close-up dorsal view of the terminalia then and hopefully match it to one of the illustrations. At the same time I'll try tilting the head and light-source to see what dusting becomes evident

Jeremy