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Unfortunately, I need a female to tell certainly. It looks more like Urophora congrua, which is common in the mountain meadow and is associated with sticky-yellow-flowered Cirsium thistles, has black femora and wide subbasal crossband on the wing. The variability in U. terebrans (which has wider range of host plants) in montane populations remains obscure (terebrans specimens from Ukraine and Italy are yellow-legged, but a few known specimens from mountains also have black femora), so I'd keep myself from 100% ID as congrua until the tip of female aculeus can be examined.