1 literature reference for Proprioseiopsis okanagensis (Chant, 1957):

Author: Chant, D.A.
Year: 1957
Title: Descriptions of some phytoseiid mites (Acarina, Phytoseiidae). Part I. Nine new species from British Columbia with keys to the species of British Columbia. Part II. Redescriptions of eight species described by Berlese
Source: The Canadian Entomologist, Canada, 89(7), 289–308.