Painted Ladies feed on a huge variety of host plants, and it doesn't surprise me that you found them on Comfrey. They usually prefer members of the Aster Family (esp Thistles) and Mallow Family (Malvus, Hollyhocks) as well as a few Legumes. Note: If you don't like the idea of growing ugly Thistles in your garden, try Globe Thistle. With its handsome silver foliage and attractive purple flowers, it makes a good companion to Hollyhocks Arabian Nights (black flowers) and is also a raging nectar source to a great many pollinators as well. Also drought tolerant.

Sophora Worm or Genista Worm, Uresiphita reversalis. Joe

I have caterpillar's that look similar, in that they have no obvious legs. But some are brown (slightly striped) and some bright green. They are eating leaves voraciously in my greenhouse and the basil in particular is struggling to grow faster than it is being eaten. I remove a kill as many as I can find but especially the green ones are hard to spot. It's now only August and some of the links above suggested that these larvae are only laid in late summer, and I've had the problem since July, and maybe earlier (but i first guessed slugs as i have lots of those too but pellets have more or less one that battle for the moment) HB

http://forums.gardenweb.com/discussions/3430414/tersa-sphinx-moth-caterpillars?n=7 http://forums.gardenweb.com/discussions/3459077/is-this-a-sphinx-moth-cat