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At least in my Malaise traps it is much more common than Siphona maculata itself. It is not the first time, when I hear about rarity of common species their in the West. In one Malaise trap from a suitable place that was exposed all season I usually obtain about 10 species of this genus, the most abundant are Siphona pauciseta, S. setosa, but S. genuculata is very common only in the western part of the country.