Records of mites parasitizing pseudoscorpions are summarized and new host-parasite associations are reported. Trombidium brevimanum (Berlese 1910) (Trombidiidae) has been found on Neobisium bernardi bernardi Vachon 1937 in France (new country record for T. brevimanum), and T. mediterraneum on N. carcinoides (Hermann 1804) in Norway (new country record for T. mediterraneum). These are the first cases in which both the mite and the pseudoscorpion have been identified. An additional record of Trombidium sp. (probably T. mediterraneum) on Neobisium fuscimanum (C.L. Koch 1843) is given from Poland. A previously unpublished record of a Leptus larva on a pseudoscorpion, possibly belonging to the genus Neobisium, is noted from France. Parasitism of Roncus lubricus L. Koch 1873 by an unidentified larva of Parasitengona (probably Trombidiidae) is also noted from Germany. The stylostomes (feeding canals) formed in pseudoscorpions by trombidiid mites are similar to those produced in other hosts. Scars in the pleurum of the pseudoscorpions are interpreted as the result of attempts at fixation by the mite larvae. Pseudoscorpions appear to represent alternative hosts for Trombidium larvae, although the successful completion of development has yet to be demonstrated.