The three remaining species are separated primarily by checking the shape of the PM line. Two of the species are visually identical and cannot be separated from an image alone:
The PM line has three arcs: Gondysiasmithii or telma
Unless you have evidence of rearing, dissection or a DNA test, the images of moths in these two species should be placed ----> here
Larvae:
Range
Most species are widespread in the south-eastern USA. (2)(3)
Print References
Sullivan, JB and A. Legrain 2013. Gondysia preceeded Neadysgonia (Lepidoptera, Erebidae, Erebinae), a new generic synonymy from Southeastern United States – Corrigendum.(1)