Parnassian Evermanni Thor are a rare species that are found in Northern Asia and Alaska. They have also a small distribution in northern British Columbia and Yukon. They are rare mountain butterflies, usually found fluttering fast and low among high altitude grassland and moss covered rocks. The female is characterised by her off-white wing colour while the mle sports an unusual yellow ground colour. The typical wing span for the Parnassian Evermanni Thor is 46 to 54 mm. Generally, it takes two years for the Parnassian to reach maturity, spending time in each stage as an egg, caterpillar, chrysalis, and finally reaching maturity as a butterfly. The long gestation period requires the egg to overwinter, surviving the long winters that can reach as cold as -50 degrees Celsius. The adult Parnassian Evermanni Thor reaches their flight season in late June and early July. This is the optimal time for butterfly observers to visit the Parnassian Evermanni Thor. The Yukon is home to over 90 known species of butterflies. This specimen was collected by local resident John Vanags in the Keno Hill region. Keno Hill is one of the most accessible areas in the world to view these rare specimens. Due to the major mining and mineral exploration in the area, drivable roads lead to the top of the hill, requiring only a small walk to observe the butterflies. Collecting butterflies in Yukon requires a permit.
Keno City Mining Museum, Keno City