Key to the Mermiria of the Southeastern United States
Adapted from Otte 1981

1 Lateral pronotal carinae present and cut by two sulci; postocular bands and a dorsal central stripe are pinkish
  Lateral pronotal carinae absent, but with the edge of the pronotal disk cut by three sulci; postocular bands and dorsal stripe, if present, brown
2
2 Dorsum of body without central dark stripe; dorsal field of forewings dark along margins, and pale medially
  Dorsum of body with central dark stripe; dorsal field of forewings pale along margins, and dark medially; coastal