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Sorry, I've been off Diptera.info for a couple of weeks - so only recently got to see this! Very nice find! This species (correctly identified as Cremifania lanceolata of course) was described from a single male specimen from Hungary. Your specimen is essentially identical to the type (of which I have photos), and that arista is unique to this species within Cremifania. (I have in my notes that it is also known from the Czech Republic, but I haven't tracked down where I got that info!). In any case, the other two species in this genus (one Nearctic, the other Palaearctic [also introduced into the Nearctic for biocontrol of conifer adelgids]) are strictly known from adelgids on conifers. This species was collected in an area where the nearest conifers were about 1km away. In any case, it seems unlikely this would be feeding on scales on Euonymus or any other plant, unless Cremifania have some very odd host relationships! If you manage to get any more of these (keeping my fingers crossed), I would be very interested in specimens, as chamaemyiids are one of my specialty groups! ;) This genus has jumped between being considered a chamaemyiid and a cremifaniid (with no close relation to chamaemyiids) - I fall in the former category, considering this a chamaemyiid, and is a topic I'm working on.