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In Europe this definitely would be Trichinomyia. First record for the Nearctic of an undescribed species (presumably because only the female was found):
Cumming, J.M., B.J. Sinclair, S.E. Brooks, J. Mlynarek & T.A. Wheeler, 2018. Diversity of saproxylic dance flies and long-legged flies (Diptera: Empidoidea) in a temperate deciduous forest in Quebec, Canada. - Zootaxa 4521(2): 287-293.