The clouded yellow, latin name: Colias croceus . It's a small butterfly of the Pieridae family. We call it, 'de Oranje Luzernevlinder', in English: The Orange Alfalfa Butterfly. I've never seen this butterflies before. But this week I noticed two of them every day, opposite our house; they were so hard to 'catch'. I run after them very fast, I think the neighbors have had fun when they saw me again, same every day. But here's a copy, unfortunately not with open wings. Too bad, because they are so beautifully drawn. Thank you very much for your look! Zoom will help, 'cause it's a macro-shot.