They weren't as common as the Circotettix maculatus, but I did see them at several high-elevaton locations above 11,000 feet. The hind wings in this population are a pinkish orange.

Now that is interesting, I've never seen C. neglectus with other than yellow wings. C. lateritius is often orange, but this isn't that. Now I'm going to have to add a trip to the high Sierras to my list of places to visit again.

Could there be a problem with the ID? I was pretty sure that it was a Cratypedes, and the lateral lobes of the pronotum point to neglectus rather than laeteritius. But with both the habitat and the hindwing color being odd for neglectus, I have to wonder about the ID.

I don't think the habitat is that odd, just higher than I knew about. C. neglectus is a mountain bug, and I've seen it above 10,000 ft in Colorado (but the equivalent environment in California is lower). The wing color is just interesting, yet since most of the related species have varied colors of yellow to orange, pink, or red wings, it's not that unexpected. I think you got the ID correct. C. lateritius is much less likely to be up that high, and I'm sure it's not that anyway. Also, I'm a sucker for seeing the "odd-balls", so just want to go enjoy seeing them alive.

Your clarification reassures me of the ID.