Taxa included

Théis, C. de (1832). Lettre adressée à M. Audouin, sur quelques Arachnides des genres Hydrachna et Chelifer. Annales des Sciences Naturelles 27: 57–78.

Taxon
Chthonius ischnocheles (Hermann, 1804) (Pseudoscorpiones: Chthoniidae) 63–66, (misidentification; see Chthonius orthodactylus (Leach)), Obisium ischnocheles Hermann
Chthonius orthodactylus (Leach, 1817) (Pseudoscorpiones: Chthoniidae) 63–66, plate 1 figs 3, 3a–c (misidentification), Obisium ischnocheles Hermann
Neobisium Chamberlin, 1930 (Pseudoscorpiones: Neobisiidae) 63, Obisium Illiger
Obisium muscorum Leach, 1817 (Pseudoscorpiones: Cheliferidae) 66–67, plate 1 figs 4, 4a, Obisium muscorum
Neobisium (Neobisium) theisianum (Gervais, 1844) (Pseudoscorpiones: Neobisiidae) 68, plate 2 fig. 1 (misidentification), Obisium carcinoides (Hermann)
Obisium walckenaerii Théis, 1832 (Pseudoscorpiones: Cheliferidae) 68–69, plate 2 figs 2, 2a–c, Obisium walckenaerii
Chelifer Geoffroy, 1762 (Pseudoscorpiones: Cheliferidae) 69, Chelifer
Chelifer cancroides (Linnaeus, 1758) (Pseudoscorpiones: Cheliferidae) 69–73, plate 3 figs 1, 1a–c, Chelifer cancroides (Linnaeus)
Chernes cimicoides (Fabricius, 1793) (Pseudoscorpiones: Chernetidae) 73–75, plate 3 figs 2, 2a–b (misidentification), Chelifer scorpioides Hermann
Pselaphochernes scorpioides (Hermann, 1804) (Pseudoscorpiones: Chernetidae) 73–75, plate 3 figs 2, 2a–b (misidentification; see Chernes cimicoides (Fabricius)), Chelifer scorpioides Hermann
Chelifer nepoides Hermann, 1804 (Pseudoscorpiones: Cheliferidae) 75–77, plate 3 figs 3a–b, Chelifer nepoides