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Mesnil (in Lindner) very clearly states that the parafacial is hairy on 'upper half' in Ptesiomyia alacris, and even more in other species of this genus.
This is little more than half, but given all the evidence I still think it is Ptesiomyia alacris.
The main question should be: what are these 'Ptesiomyia' with bare parafacials ? Those are the aberrant ones.


Theo