Johnston et al. 2015
Diagnosis: Body elongate to ovate, glabrous. Pronotum subquadrate, anterior angles rounded, faintly or not projected forward, posterior margin similar in width to anterior. Elytra smooth (ssp chihuahuaensis) to sulcate (ssp. obsoletus). Prosternum with distinct, though short, process projected posteriorly of procoxae. Profemur always unarmed, inner tibial spur in females, if elongate, tapering evenly from base to apex, not spatulate. Tarsi without tomentose setae beneath. Female genitalia with outer lobe of coxite strongly produced, rounded, much larger than inner margin.
Distribution: Mohave, Coconino, Navajo, Apache, Yavapai, Gila, Graham, Greenlee, Maricopa, Pinal, Pima, Santa Cruz, Cochise counties, AZ. Broadly distributed in Canada and United States west of the Rocky Mountains and western Mexico.