The Junonia ("buckeye") genus has become a complex all of its own. There seem to be intermediates everywhere. Sure some clear-cut examples, at least superficially, exist everywhere too.
Let us briefly go to Junonia evarete "Tropical Buckeye". We do get this species out here. However it is the "dark" form. Here are some pics from Maravillas Ranch, 5 June 2012:
Junonia evarete nigrosuffusa "dark Tropical Buckeye"
This is typical of the "dark" Tropical Buckeye way out here. However, the immediate difference between "our" dark tropical and the darks in portions of South Texas is on the upperside of the forewings.
The largest "eyespot" has basically zero color outlining around it. The thin orange/pink fades then terminates below it.
The Junonia-complex is one that needs much further study, though recent research shows that Junonia species have likely been inter-breeding for a long time.
Personal communication with certain authorities have pretty much been "we don't know where to put that dark buckeye that occurs in the trans-Pecos.."
So, dark Tropical Buckeye, (Junonia evarete nigrosuffusa) ? Really?
If we must hold onto an ancient common name at the moment, then "'dark' Tropical Buckeye."
Beautiful bug with an unknown taxonomical future.
Come out and see for yourself. This property will be accessible through guided tours and hikes during the "Birds and Butterflies of Big Bend" event. Click there or scroll up the main page.