Buethobius

Genus Buethobius Chamberlin, 1911

Uniarticulate leg tarsi 1–12 supposedly distinguish this genus from Yobius . The new genus Spleopsosobius is distinct from Buethobius in having modified tergites and a much greater number of antennomeres (up to 60 as opposed to 35–45 in Buethobius). The tarsus of leg 13 of Buethobius species can be either uniarticulate or biarticulate, depending on the species and perhaps on the developmental stage of the specimen. Pores are found only on the last four coxae, as opposed to the last five coxae in Zygethobius . All tergites have rounded corners and practically straight posterior margins. The distribution of the genus is not well defined. The two Ohio species described by Williams & Hefner (1928) are difficult to recognize from the descriptions and have never been reported subsequent to the original publication.