Berger's Clouded Yellow Butterfly

Since I know virtually nothing of Butterflies I have to rely on you guys. Thanks for the help.

Looks perfect to me bayucca, as per usual! :-)

Already checked ;-)...

Tricky and interesting one!! In my eyes it must be a Colias alfacariensis, but I am not very happy with the dark margin of the hindwing, although I know that Colias sp. and Colias alfacariensis are very variable. It is a female for sure. Need anyway verifying. To my knowledge Colias hyale is not found in Castilla y Leon, and you can not separate Hylae and Alfacariensis from a picture, not even exactly with DNA. I didn't found another Colias sp. which looks like yours and is within your range. What do you think??