Taxa included

Say, T. (1821). An account of the Arachnides of the United States. Journal of the Academy of Natural Sciences of Philadelphia 2: 59–82.

Taxon
Parachelifer muricatus (Say, 1821) (Pseudoscorpiones: Cheliferidae) 63–64, Chelifer muricatus
Americhernes oblongus (Say, 1821) (Pseudoscorpiones: Chernetidae) 64, Chelifer oblongus