Summary Adventive and potentially pestiferous species are a constant threat to the agriculture of Florida. Fiorinia externa Ferris (Hemiptera: Diaspididae), the elongate hemlock scale, is a recent but persistently intercepted pest of Fraser fir and related species grown out-of-state and imported annually into Florida as cut Christmas trees. Although this and a second species, Hemiberlesia ithacae (Ferris) (Hemiptera: Diaspididae), the hemlock scale, may not become established in Florida on native or cultivated hosts, the risk remains and illustrates the importance of continued vigilance against pest species incursion.