NOVA SCOTIA: Colchester County: Debert, 25 June 1952, Dept. Natural Resources, 10 specimens, NSMC; Shelburne County: Shelburne, 24 June 1965, R.C. Clarke, 10 specimens, CNC; Shelburne, 7 July 1965, R.C. Clarke, 2 specimens, CNC.
McNamara (1991) reported this Palearctic species in both Nova Scotia and New Brunswick based on accounts in Gordon (1976, 1985) that, in turn, are derived from reports in Clarke and Brown (1961) and CIBC (1971) of deliberate introductions made in New Brunswick, Nova Scotia, and Newfoundland between 1951 and 1955, and then again between 1962 and 1966. These were done for biocontrol of the balsam wooly adelgid, Adelges piceae (Ratzeburg). While S. impexus survived for up to five years (Gordon 1976), the introduced populations declined and there is no evidence of longterm persistence. Contemporary collecting has not found this species at sites where it was introduced or anywhere else. Since there is no evidence of persistence we do not consider it to be presently part of the fauna of Nova Scotia or New Brunswick.