. The Canadian field-naturalist. Natural history. lb Polyaticia ateller'i ^ sSorTiateria V-nigra Arctonetta c/^o^a/jo/v J^i5cheri cheek feathering projects forward of that of the crown. Atlantic Eider, Somaleria moUissima. Plate II, Figs. 1, la, 2, 2a. The long Y-shaped arms of the bill processes ex- tending up the sides of the crown are distinctive of the male Atlantic and the Pacific Eiders. In the females of these species the crown feathering not nearly reaching to the nostrils and the cheek feathers extending beyond those of the crown are diagnostic. In the 1910 Check List, the
. The Canadian field-naturalist. Natural history. lb Polyaticia ateller'i ^ sSorTiateria V-nigra Arctonetta c/^o^a/jo/v J^i5cheri cheek feathering projects forward of that of the crown. Atlantic Eider, Somaleria moUissima. Plate II, Figs. 1, la, 2, 2a. The long Y-shaped arms of the bill processes ex- tending up the sides of the crown are distinctive of the male Atlantic and the Pacific Eiders. In the females of these species the crown feathering not nearly reaching to the nostrils and the cheek feathers extending beyond those of the crown are diagnostic. In the 1910 Check List, the standard au- thority, the American Eider is given as a full species, Somateria dresseri. Late investigation, how- ever, has shown that it is only a subspecies of the eider common to the New and Old Worlds (At- lantic Eider), as all intermediates between it and Atlantic specimens this throat mark is said to be present, in which case and in females, the relatively larger and heavier bill, the shorter and more acutely pointed bill processes on the fore crown, and the slightly blunter ending of the feathering on the sides of the bill of the Pacific seem to be the only diagnostic guides. None of these points are satis- factorily obvious or reliable but the ranges of the two species are so widely separated that it only be birds from a limited section of the Arctics or occasional stragglers that need ever be confused. Spectacled Eider, Arcioneita fi^cheri. Plate III. Figs. 3, 3a. 7 he white spot about the eye and the black spec- tacle mark of the male Spectacled Eider is unmis- takable. In the female this white eye spot is indi-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Ottawa Field-Naturalists' Club. Ottawa
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