on Ulmus, https://www.inaturalist.org/observations/218960778, underside leaf https://www.inaturalist.org/observations/219268210 (think belonged to the unhairy ones, but not entirely sure), https://www.inaturalist.org/observations/219267968
I know that you can Lucilia not ID to species from photos normally. But this looks so different and match the other photos of this species