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I recently received this query from a young French entomologist, translated by me, and since nematocera aren't really my thing I wondered if someone on the forum could help: 'In the case of nematocerans, with neither anal veins joining the wing margin, nor disc cells, nor ocelli, and with a reduced number of veins (no more than 8), the key often leads me to choose between Chironomidae and Ceratopogonidae, without either choice being fully convincing. Also, I regularly find myself at this stage, with very different individuals, not necessarily showing the distinctive antennae for these two families...'