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It is surely none of the North American Palpada, and I also first thought of Kertesziomyia, but none of my specimens or the one I could finds pics of have a yellow face. Looking deeper in my collection I found several species of Austalis Thompson 2003 (yes NOT Australis), which are greenish metallic and have a yellow face. Also the space between the eyes is narrow in Kerteszomyia, but broader in Austalis, which also better matches the pictures. The distribution is From New Caledonia, through Australia to Asia, so really far away from the Azores! Very interesting find... now we need some specimens collected!!