I only called it anicia because I thought chalcedon was a more western bug. What's the total range of each species?

E. chalcedona is mostly found west from the Continental Divide; however, it extends east into the Black hills / Niobrara region where the subspecies bernadetta was described from. So, generally E. anicia ranges a bit further east, is a bit less prevalent near the west coast and seems to range a bit further north into Canada, and a bit further south in Arizona. For the most part though, they are both widespread through mountainous regions west from the Rockies. It is not unusual to find the two together in the same area (as in the Black Hills). Almost (if not quite) universally, E. chalcedona is blacker looking, with much less orange above; almost black and white (or yellow). Below there is little difference. E. chalcedona tends to average larger in any given region, but it's not consistent enough, and overlap is too great to rely on size. The books have mixed them together so much lately that the definition of the two has been badly blurred, and some people still consider that each region has a different species, so it's confusing.

Awesome, thanks so much for the info! I really appreciate it.