Colias nastes tyche werdandi
Arnold Spuler: Die Schmetterlinge Europas. 3, E. Schweitzerbartsche Verlagsbuchhandlung, Stuttgart 1910.
Date 24 October 2008
Author Harald Süpfle
Source: https://commons.wikimedia.org/wiki/File:Colias_nastes_werdandi_(Spuler).png

The Booth's sulphur or pale Arctic clouded yellow (Colias tyche) is a butterfly in the Pieridae family. It is found from Baffin Island west along the Hudson Bay and arctic coasts of the Nunavut and Northwest Territories mainland and the southern tier of Arctic Islands to northern Yukon, Alaska, and Eurasia.