www.ukbutterflies.co.uk

I saw these two in the Seirra Nevada a couple of days ago. Pretty sure the lighter one will be helice, but how can I tell the difference between that and Berger's?
Thanks

There were a lot more Clouded Yellows higher up in the Sierra Nevada on my next visit. The majority were cream in colour.

OK, let's try with this one. Also seen in the Sierra Nevada. Marbled Skippers, or maybe Southern Marbled Skippers?