Macrosiphum subarcticum Robinson 1979 = Macrosiphum valerianae (Clarke 1903)

Paratypes of M. subarcticum, described from Epilobium angustifolium in northern Manitoba, agree fully with other material from this host in Canada in the BMNH collection identified by several authors as M. valerianae . Types of valerianae are lost, and Robinson suggested that it should be regarded as a nomen dubium, but there is no adequate justification for this, and this species is relatively well­known as valerianae in western USA (e.g. Palmer, 1952; Antolin & Addicott, 1988).