Pig-tailed macaques. Don't know whether northern or southern.
They left the collection in 1989 to be replaced by Sulawesi crested macaques. This enclosure was the largest monkey run in the Sobells and was replaced by the gorilla night dens in the present Gorilla Kingdom.
This group stemmed from two males and three females kept in the old Monkey House. I believe descendants of the group are still in a European(German?) Zoo but can't remember which they went to.