Duskywing Caterpillar (Erynnis sp.)

Duskywings can be identification challenges as both adults and larvae. This caterpillar was observed feeding on Southern Red Oak (Quercus falcata).

Duskywing Caterpillar
Mixed forest edge, Orange Co., NC
11 Oct 2013

Both Juvenal's and Horace's Duskywings occur at this site. Any idea how to distinguish their caterpillars in order to identify this individual?

North Carolina Butterflies | North American Butterflies | Jeff's Nature Page

Created on ... Oct 19, 2013 | jeffpippen9@gmail.com