While collecting in Nevada during the summer of 1935 in the Toiyabe Range of Mountains, which rise to an elevation of almost 12,000 feet, and the southern end of which is approximately 75 miles north of Tonopah, I came across a colony of butterflies that have ever since caused me much speculation. From this colony and from another in the nearby Toquima Range, just across the Big Smokey Valley, I secured forty-seven specimens all of which are similar to one another but distinctly different from any other satyrid that I have encountered.