Náttúrufræðingurinn - 1968, Síða 104

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NÁTTÚ RUFRÆÐINGURIN N
HEIMILDIR - REFERENCES
Brooks, A. 1920. Notes on some American ducks. Auk 37:353—367.
Dinesen, G. B. 1926. 10 Aars Ophold iblandt Nordislandske Fugle. Köbenhavn.
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SUMMARY
The Common (loldeneye (Bucephala clangula) in Iceland,
with notes on identification
by
Arnthor Gardarsson, Museum of Natural Histoiy,
Rcykjavík.
1. Earlier reports in the literature regarding Bucephala clangula in Iceland are
rather misleading and sorne of these occurrences liave not been adequately
described in print. In this paper all records of the species, including a num-
ber of new ones, have been compiled.
2. Series of B. clangula and li. islandica in tlie Museum of Natural History in
Reykjavík and the Museum of Vertebrate Zoology, Berkeley, California, as
well as a few skins from the U. S. National Museum in Washington, were
examined in order to find a reliable method of separating young or females
of the two species in the hand. The width of the nail relative to that of the
bill at the anterior angle of the nostrils was found to separate all fullgrown
birds (Fig. 1), the downy yonng may sliow a slight overlap in this ratio. In
fully grown islandica the width of the nail is over 42% of the billwidth at