Subspecies based on ranges described in Emmel, T., 1969. Also, more recently, a range map was published by Calhoun, J., Journal of Lepidopterists' Society, 70(1): 20-46, March 2016. Despite Wikipedia listing Texas as the range of similar-looking subspecies C. pegala alope, this is apparently incorrect. That subspecies is not even found west of the Mississippi River.