*This is not an eggs update that happens to be mysterious, it's an update on some mysterious eggs!
Well, I found the egg mass by chance, 12 hours later they'd hatched, 12 hours after that, you would never know they had been there! I haven't been able to ID them, but I have a few guesses. I was thinking maybe sawflies, now I'm thinking some kind of moth. When they were still on the plant, if I tapped the stem, the tiny 1 millimeter caterpillars would drop from a strand of silk, and the stem they were on was covered in silk by the time the left. It was hard to see, but they moved like an inchworm. That makes me think moth. Maybe a type of cutworm moth. That's the best I could do, unless I see something getting massively defoliated, I'll probably never know for sure.
Click on the picture to see a larger version, it's hard to get the camera to focus on 1 millimeter caterpillars.