Hi. The placename on your census is Fetterangus. The parish of St Fergus, although surrounded by Aberdeenshire, was actually a detached part of Banffshire. Sometimes you find records for it under Aberdeenshire, sometimes under Banffshire. Part of the parish of Old Deer, where Fetterangus is, was also at one time part of Banffshire, the rest of it in Aberdeenshire.
Graham.