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These flies have been photographed several times over the last two years on the wings of dragonflies and as in this picture, on the thorax of a damsel fly. They appear to have distended abdomens as if sucking haemolymph ... In one of the oases in the mountains of northern Oman, eastern Arabia. Can anyone provide an ID or information? Ceratopogonidae?
Drew

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I cannot see the image (make sure there are no spaces in the file name) but there are several species of Ceratopogonidae that will attack larger insects like damselflies and dragonflies to suck haemolymph.

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Find a little more info here: http://www.inbio....howand.htm (specifically for Costa Rica but in general useful everywhere).

EDIT: I added a link to the Cerayopogonid Web Page to the Web Links (Families: Nematocera).

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I think, damselfly is Platycnemididae.

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You are right about Platycnemididae. I think the species is Arabicnemis caerulea