Euphydryas colon By Matt Young August 30, 2021 11:00 MST Snowberry checkerspot butterfly, by Malcom Schongalla. Photography Contest, Honorable Mention. Euphydryas colon – snowberry checkerspot butterfly, Hillscreek, Oregon, June, 2021. The photographer writes, "Some references list this as a subspecies of Euphydryas chalcedona (chalcedon or variable checkerspot). I am not a butterfly expert and this is my best attempt at identification."