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This one has evaded me for a long time, perhaps someone can let me have it:
Van der Goot, V. S., & Van Veen, M. (1996). De Spillebeenvliegen, Wortelvliegen en Wolzwevers van Noordwest Europa. Jeugdbondsuitgeverij, 3.
I suspect it has the best keys for Loxocera (s.l.) prior to my attempts (https://identikit...silidae/l/)