Distinctive, large eyes, dark body with prominent raised elytral ridges, variable red-orange, sometimes yellow, markings on elytra, though these sometimes absent. Sometimes has red tinge to body. Males have distinctive leg morphology: expanded hind femora with a large tooth on each, and expanded foretarsi.
(1) Also, abdomen of male appears to jut out from under abdomen much more than female, at least based on this individual:
The black body with orange markings resembles the pattern of the related Sexton Beetles, Nicrophorus. Perhaps this is a mimicry complex.