The larger, ground-dwelling invertebrates were collected from a heather moor in Dunbartonshire. The commoner species included Bradycellus ruficollis, Olophrum piceum, Othius angustus, O. punctulatus, Quedius boops, Aleocharina and Neobisium muscorum. After isolation in captivity they were offered various living animals and/or plants as food and records were kept, from March to August 1955, of the species and quantity eaten. The smaller staphylinids favoured the collembola but also ate some mites whilst O. punctulatus fed on the larger invertebrates. Neobisium ate the larger active collembola and Bradycellus fed on Calluna and a few collembola.