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First of all I would like to compliment Benoit on the nice photos of the Geomyza's. Paul could be right, it might concern Geomyza tripunctata. However there is a species which closely resembles G tripunctata! Geomyza nartshukae looks very much like G. tripunctata. Where the thorax of G. tripunctata may vary from completely black to completely reddish, it is completely reddish in G. nartshukae (in most cases). The two species can best be distinguished by looking at the terminalia. For the females (your photos concern a female) you should look at the shape of the 8th sternite (See Carlos-Tolra, M. 1994. Three New Species of Opomyzidae (Diptera) from Spain. Entomological Review, 73(1): 91-95.). If you have collected specimens it is possible to make sure which of the two species you're dealing with. If you only have pictures of the specimens, I'm afraid you will never be sure!

Jan Willem van Zuijlen