were first discovered in my hometown (Amherst, MA, per the reference I cited on the guide page), so I'm determined to find them too. They have never properly been described or illustrated, but that paper refers to the length of the mine at different larval stages, indicating a more or less linear mine like these.

The only area where I have found these leaf mines was in the local municipal park next to Black Earth Creek. There are a lot of these violets growing in our yard, too, but I haven't noticed any there, but I'm going to watch for them next summer.