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According to the Stuckenberg's article on Lampromyia: http://www.zfmk.d...BB48H7.PDF

in page 77 it appears this info: median vitta of mesonotum broad, dar, mat, not divided longitudinally by a pale midline stripe; costal cell conspicuously dark smoky brown. And also conspicuous greyish pruinose bands on abdomen...

so it should be L. canariensis. Also the antennae profile fits the one in the article with the specimen you sent to me kindly. Thanks.