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Very interesting. Wing venation is very characteristic here, need to check my collection.

Presence of palpus is sexual dimorph in Eloceria. If this would be Eloceria, it would be a female. Which would be strange, given the swarming behaviour.

Swarming is known from males Siphona ingerae and male Entomophaga. Clearly, both don't fit here.

Theo