Key to the South American species of Euryptera

1. Prothorax and elytra orange. Brazil (Mato Grosso, Goiás, São Paulo) (Fig. 3). E. leonina Gounelle, 1911

- Prothorax and elytra bicolored, orange and black.......................................................................................2

2. Pronotum orange, with a median black vitta; elytron with at least three elevated longitudinal carinae, apical spines feebly developed. Brazil (Espírito Santo to Santa Catarina), Paraguay, Argentina (Misiones) (Fig. 4) ......................................................................................................... E. unilineatocollis Fuchs, 1956

- Pronotum orange, with two apically diverging black stripes; elytron with two carinae, and with apical spines well developed. Brazil (Rondônia, Mato Grosso, Goiás, Espírito Santo to Rio Grande do Sul), Bolivia, Paraguay, Argentina (Tucumán, Jujuy, Salta, Misiones) (Fig. 2) .................................................... ....................................................................................... E. latipennis Lepeletier & Audinet –Serville, 1828