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Species associations of oribatid mites in maritime lichens on the island of Ailsa Craig, Firth of Clyde, were investigated. The thirteen lichen species examined yielded a total of seventeen oribatid species assignable to two discrete associations. One was characteristic of foliose lichens on exposed rocks and the other was found in terricolous fruticose lichen on acid healthland. Morphology of the lichen thallus and altitude of the collection site were found to influence the abundance, occurrence and species diversity of the mites.

A new genus (Traskorchestianoetus gen. nov.) represented by two species T. spiceri sp. nov. and T. brevipes sp. nov. (Acari, Histiostomatidae) are described from the hypopial stage phoretic on the amphipod Traskorchestia traskiana (Stimpson, 1857), from Vancouver Island, Canada.