Taxa included

Ewing, H.E. (1911). Notes on pseudoscorpions; a study on the variations of our common species, Chelifer cancroides Linn., with systematic notes on other species. Journal of the New York Entomological Society 19: 65–81.

Taxon
Chelifer cancroides (Linnaeus, 1758) (Pseudoscorpiones: Cheliferidae) 66–75, 77–78, figs 1–8, Chelifer cancroides (Linnaeus)
Idiochelifer nigripalpus (Ewing, 1911) (Pseudoscorpiones: Cheliferidae) 73, Chelifer cancroides nigripalpus
Chelifer cancroides dentatus Ewing, 1911 (Pseudoscorpiones: Cheliferidae) 73, (synonymised by Hoff, 1949b: 486–487), Chelifer cancroides dentatus
Chelanops corticis Ewing, 1911 (Pseudoscorpiones: Chernetidae) 75–76, 79, fig. 9, Chelanops corticis
Chernes sanborni Hagen, 1868 (Pseudoscorpiones: Chernetidae) 76, 79, fig. 12, Chelanops sanborni (Hagen)
Dinocheirus pallidus (Banks, 1890) (Pseudoscorpiones: Chernetidae) 76, 78, (misidentification; see Parachernes (Parachernes) virginicus (Banks)), Chelanops pallidus (Banks)
Microcreagris magna (Ewing, 1911) (Pseudoscorpiones: Neobisiidae) 76–77, 79, fig. 14, Blothrus magnus
Microbisium brunneum (Hagen, 1868) (Pseudoscorpiones: Neobisiidae) 76, 79, fig. 13, Obisium brunneum
Parachernes (Parachernes) floridae (Balzan, 1892) (Pseudoscorpiones: Chernetidae) 76, 79, fig. 10, Chelanops floridae (Balzan)
Parachernes (Parachernes) virginicus (Banks, 1895) (Pseudoscorpiones: Chernetidae) 76, 78, fig. 11 (misidentification), Chelanops pallidus Banks
Chthonius longipalpis Banks, 1891 (Pseudoscorpiones: Chthoniidae) 77, 80, fig. 15 (as Chthonius longipalpus [sic]), Chthonius longipalpis
Americhernes oblongus (Say, 1821) (Pseudoscorpiones: Chernetidae) 79, Chelanops oblongus (Say)
Tuberocreagris rufula (Banks, 1891) (Pseudoscorpiones: Neobisiidae) 79, Ideobisium rufulum (Banks)
Apochthonius moestus (Banks, 1891) (Pseudoscorpiones: Chthoniidae) 80, Chthonius moestus
Chthonius pennsylvanicus Hagen, 1868 (Pseudoscorpiones: Chthoniidae) 80, Chthonius pennsylvanicus