Key to the South American genera of Lepturini

1. Pronotum with sides sinuate, hind angles not toothed–appearing; humeri obliquely truncated.................... ............................................................................................................................. Cyphonotida Casey, 1913

- Pronotum campanuliform, base strongly impressed on each side, giving hind angles a toothed appearance; rounded humeri............................................................................................................................................2

2. Intercoxal process of mesosternum narrow, from 1/3 to 1/2 the diameter of the coxal cavity, without projection; metatarsomere 1 longer than the others combined.........................................................................3

- Intercoxal process of mesosternum broad, at least 2/3 the diameter of the coxal cavity, and projecting beyond; metatarsomere 1 as long as or shorter than the others combined.................................................4

3. Elytra parallel-sided or slightly expanded to apices; ventrite 5 without sexual dimorphism........................ ................................................................................................... Lycochoriolaus Linsley & Chemsak, 1976

- Elytra tapering to apex; males often with the ventrite 5 strongly inflated at the sides.................................. ............................................................................................................... Strangalia Audinet – Serville, 1835

4. Elytra parallel-sided, without dorsal carinae ................................................ Megachoriolaus Linsley, 1970

- Elytra expanded apically, dorsal surface with carinae....... Euryptera Lepeletier & Audinet –Serville, 1828