Insect and Spider Identification: CLOSED: Cool caterpillar on a cleome, 1 by Katlian

Katlian wrote:
I was collecting seeds from Cleome lutea plants north of Reno, Nevada, and I saw this caterpillar on one of the plants. I've narrowed it down to the Pieridae (whites, yellows, and sulfurs) but I'm not sure which genus. It seems distinctive but doesn't quite match any of the photos I've seen so far. There were a lot of white and blue butterflies in the area but I didn't get any good shots of those.