Lupinus paynei host. First three photos are of the same mine. Last photo of another mine shows how it starts very narrow on the abaxial leaf without visibly mining the other side.
Is this what's making these spots??
loop Newtonbrook Creek Ravine to East Don Parkland Trail, Finch Ave East.
Minor working on Canadian Thistle
Reared from Quercus robur.
Adult emerged on 4/11/24.
Batch reared with three others, see more images and info here: https://www.inaturalist.org/observations/206310617