In a recent revision of Spilodiscus Lewis, several species were removed from that taxon to Hister L. These five species, Hister militaris Horn, H. lucanus Horn, H. pioti Marseul, H. humilis Fall, and H. sarcinatus Lewis, form a clade within Hister and are not closely related to Spilodiscus (though species in both groups commonly exhibit red elytral markings). Here the species are revised, and comments on some unusual facets of their morphology and biology are discussed in light of a tentative phylogenetic hypothesis.
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Vol. 95 • No. 3