Capillaria cadovulvata was first described in 1945 by Madsen who found that it occurred commonly in the caeca of adult pheasants, and occasionally among partridges in Denmark. It is recorded now from a grey partridge Perdix perdix in England, where it had set up pathological changes which had been the cause of death. Madsen does not mention the presence of any lesions in association with this parasite. Though this is the first record of the species in England, it may be more common, for the species of Capillaria are not always easy to differentiate without recourse to fairly high magnification. In view of this, and because of its pathogenic nature, it seems worth while recording its occurrence and the lesions that may follow its presence.