The antler moth, Cerapteryx graminis (L.), first discovered in Newfoundland in 1966, has now successfully established itself over an area of approximately 60 km in the greater St. John’s area and surrounding localities. It has become a pest of limited economic importance in hay and pasture fields, and lawns. Black light traps, operated at Mt. Pearl and Kilbride during 1966–1978, were used to monitor population build-up. Notes on the life history of the antler moth in Newfoundland, with some comparisons with that in Great Britain and Europe, are provided. Natural controls are also discussed.