Observation notes: After reading the info sounds like caterpillars are tough to identify. I'm ok if we don't know! I left the specimen out in the field since I didn't know it would be somewhat hard to tell what it is. I found it about 2 meters from a slow moving creek in washoe county about 40 miles down Red Rock rd. on BLM land to be specific. It was resting on Artemisia tridentata (big sagebrush) with Prunus andersonii (desert peach), and Chrysothamnus viscidiflorus (rabbit brush) adjacent to it. It was overcast and about 65 degrees out, raining and hailing. The specimen was slow moving even when touched. There was also a Sulfur (Coalias?) butterfly nearby but was unable to see it long enough to confirm that.