Here is a new silphid for bugguide. Taken with pitfall trap baited with rotting jackrabbit entrails. Of note are the plain, smooth elytra, sans markings or ridges.

This one had an unwelcome rider, an ant that clamped its mandibles on the beetle's left rear tarsus and held on after death. Ants were found in many of the 12 variously-baited pitfalls I had set out.