Local outbreaks of Lecanium coryli L. on white elm, Ulmus americana L., at Indian Head and Regina, Saskatchewan, were investigated from 1957 to 1960. Information on the seasonal occurrence, habits of the females, natural mortality, and chemical control of the scale has been reported (Peterson, 1960). During this investigation, data on insects attacking the scale were collected and are presented in this paper. Eleven species of hymenopterous parasites and one dipterous predator were collected. All were associated with the late nymphal stage and/or the adult stage of the female host. Table I lists the hymenopterous species and shows the numbers of adults and their emergence periods, recorded from 1958 to 1960.