Key to the South American species of Lycochoriolaus

1. Each elytron with one or two weak longitudinal carinae from base to apex...............................................2

- Elytra without carina. Brazil (Minas Gerais) (Fig. 7)............................................. L. ater (Gounelle, 1911)

2. Elytra distinctly expanded toward the apical half, apices rounded..............................................................3

- Elytra weakly expanded toward the apical half, apices narrowly, transversely truncated. Brazil (Bahia to Santa Catarina) (Fig. 5) ................................................................................... L. angustatus (Melzer, 1935)

3. Antennae black; basal half of the elytra partly black, except yellowish humeri. Colombia, Brazil (Rondônia, Mato Grosso), Bolivia (Fig. 8). ..................................................... L. lyciformis (Pascoe, 1866)

- Antennae brownish; basal half of the elytra entirely yellowish, without black marks. Brazil (Goiás) (Fig. 6) ............................................................................................................. L. angustisternis (Gounelle, 1911)