P.  Wygodzinsky and Schmidt, K., ?Survey of the Microcoryphia (Insecta) of the northeastern United States and adjacent provinces of Canada.?, vol. 2701, pp. 1 - 17, 1980.

F.  Silvestri, ?Contribo alla conscenza dei Machilidae dell' America settentrionale?, vol. 5, pp. 324 - 350, 1911.