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Yesterday I took some more photos of these flies, they seem to be frequent at the moment (in contrast to the Lauxaniid experts!). Meanwhile I waded through the forum archive to learn more about the yellow species and would now declare mine a Meiosimyza. I tended strongly to M. rorida as an autumnal species. However, I was unable to detect the av ctenidia on f1 that Roger depicted so nicely (http://www.dipter...ost_142793), and also the thoracal chaetotaxy is difficult to interpret. I can hardly see dc rows (even if the obviously broken setae were included) and have difficulties to spot the suture. Therefore the genus character "no presut dc" makes me trouble. By jizz, however, I would label the flies "Meiosimyza spec." and would be grateful for correction, if necessary!
Thanks, Sundew