Lambdin, Paris, Hodgson, Christopher & Grant, Jerome, 2007, Description of the adult male elongate hemlock scale, Fiorinia externa Ferris (Coccoidea: Diaspididae), with notes on the seasonal development of the species on eastern hemlock, Tsuga canadensis (L.) Carrieré (Pinaceae), in the southern Appalachian region (U. S. A.).

Lambdin, Paris, Hodgson, Christopher & Grant, Jerome, 2007, Description of the adult male elongate hemlock scale, Fiorinia externa Ferris (Coccoidea: Diaspididae), with notes on the seasonal development of the species on eastern hemlock, Tsuga canadensis (L.) Carrieré (Pinaceae), in the southern Appalachian region (U. S. A.)., Zootaxa 1615, pp. 29-39

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