Key to species of Oncochelyna OPITZ

1 Elytral disc dark castaneous, without dark markings (Argentina) ......................................... ................................................................... Oncochelyna barrigai (SOLERVICENS) (Fig. 91)

- Elytral disc light castaneous, with dark markings (Argentina, Paraguay) ............................. .............................................................................. Oncochelyna tuberculata (PIC) (Fig. 92)