This just hatched at my house. Marvelous right? I have had a large stand of bronze fennel planted for three years, waiting for these critters. I planted it because I never eat it (not in quantity at least) and I wanted to distract the b'flys from my dill.
This summer I discovered three LARGE catterpillars munching away and their little golden green pupae sacs. You can see it down on the porch under the just born's wings!