The boundaries and relationships of the ground beetle group Chilioperyphus Jeannel (a subgenus of the cosmopolitan genus Bembidion Latreille) are examined using DNA and morphological data. DNA sequence data from seven genes (six nuclear and one mitochondrial) indicates that Chiliopeiyphus (as newly defined) is monophyletic, and is related to the subgenera Antipetyphanes Jeannel and Plocanoperyphus Jeannel, within the South American Antiperyphanes Complex. Chilioperyphus includes two described species, B. iendocinum Jensen-Haarup and B. orregoi Germain. Beinbidion cassinense Roig-Juñent and Gianuca as well as Bembidion cuyanum Roig-Juñent and Scheibler, formerly placed in subgenus Chilioperyphus, are transferred to subgenus Antipetyphanes. Bembidion cuyanum is considered a junior synonym of B. hirtipes Jeannel. The male genitalia of Chilioperyphus is unique in having a very long flagellum that is folded twice, allowing it to fit much of its length within the walls of the median lobe. However, the brush sclerite and basal part of the flagellum are not contained within the median lobe, as they extend anterior to its base.
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