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I now have inspected many specimens (from traps) of Trachysiphonella, and the differences between the specimen of the present post and the specimen of this post: https://diptera.info/forum/viewthread.php?forum_id=5&thread_id=99207
appear to be consistent. They are most likely two distinct species. If someone knows about a detailed description of the two western European species (T. scutellata and T. ruficeps), let me know, so that I can figure out which is which.
Thanks