Description: Elongate-oblong, robust, small to large-sized, ranging from about 11–30 mm in length. Integument generally dark brown, ferrugineous, or black with whitish, ferrugineous, and ochraceous pubescence. Head with frons subquadrate, about as wide as width of two lower eye lobes. Eyes with lower lobes ovate-oblong. Genae subquadrate to elongate, distinctly shorter than lower eye lobes. Antennal tubercles prominent, moderately separated; tubercles not armed at apex (females) or armed with a small projection, or with a short to moderately long, blunt or acute horn directed forward (males); antennae about as long as overall body length, or as much as twice as long; scape clavate, about as long or shorter than antennomere IV; antennomere III variable in shape, from nearly straight to curved to sinuate, longer than scape and antennomere IV; antennomere XI shorter than X (females) or longer than X (males). Pronotum transverse, roughly cylindrical to conical, wider at base, with lateral tubercles. Elytra with sides roughly parallel; elytral apices individually or jointly rounded; elytra generally uniform in coloration or speckled, or with distinct maculae; base of elytra without tubercles or with two prominent tubercles at humeri, often with several additional prominent, shiny tubercles. Basal 1/3 of elytra with sparse to dense punctation, surface finely punctate, coarsely punctate, or granulate-punctate. Procoxae without projection, or with an obtuse tubercle. Mesosternal process with apex subtruncate to deeply emarginate. Metafemora moderate to short in length, about 1/3–1/4 as long as elytra.
The combination of the following characters will help to distinguish this genus: subquadrate frons; strongly transverse pronotum, roughly cylindrical to slightly conical, with lateral tubercles; base of elytra with two prominent tubercles at humeri; and elytra with sides roughly parallel to slightly attenuate.
South America (Argentina, Bolivia, Brazil, Colombia, Ecuador, El Salvador, French Guiana, Guyana, Paraguay, Peru, Trinidad & Tobago, Uruguay, Venezuela)
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