White form Colias hecla sulitelma
White form Colias hecla sulitelma
Just off the board today. White form Colias hecla sulitelma from Northern Norway this year. Never seen a white form. Maybe Bob would know how frequently they occur? Normal female beneath for comparison.

Re: White form Colias hecla sulitelma
As far as I know, they're extremely rare. I've only ever seen a couple.
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