Images of mites found on Douglas-fir beetles, Dendroctonus pseudotsugae Hopkins (Coleoptera: Curculionidae), in and near Prince George, British Columbia, Canada. File names provide information on which operational taxonomic unit (OTU) is being represented, and the magnification level. 10x, 20x, and 40x scales are provided as image files -- the entire scale is 1 mm and the space between each unit is 10 µm. Slides and images were prepared by H.P. Mites were collected by L-A.B. and D.H.