Judson, M.L.I. (1990a). On the presence of Chthonius (C.) halberti Kew and Chthonius (C.) ressli Beier in France with remarks on the status of Kewochthonius Chamberlin and Neochthonius Chamberlin (Arachnida, Chelonethida, Chthoniidae). Bulletin du Muséum National d'Histoire Naturelle, Paris (4) 11: 593–603.
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