as a direct result of the same; on the one hand, species recorded erroneously in certain districts, on the other hand, species overlooked. The call notes and songs must always be the guiding factor to the ornithologist, as by them alone is it possible to recognize new species, and judge the movements of those that are well known. To those who are aware of these variations of song, and who are able to recognize them, there can be very little fear of mistakes; but to those naturalists who either cannot, or who have not taken the trouble to learn the notes of every species with which they have come into contact, the possibility of mistakes from the above cause must be very great.
The following is a list of all the species that came under my notice during the fortnight I was on the island:—
Turdus viscivorus, T. musicus, T. iliacus, T. pilaris, T. merula, Saxicola œnanthe, Pratincola rubicola, Erithacus rubecula, Regulus cristatus, R. ignicapillus, Accentor modularis, Parus major, P. cæruleus, Troglodytes parvulus, Motacilla lugubris, M. melanope, Anthus obscurus, Ligurinus chloris, Passer domesticus, Fringilla cœlebs, Acanthis cannabina, Emberiza miliaria, E. citrinella, E. cirlus, Sturnus vulgaris, Pyrrhocorax graculus, Pica rustica, Corvus monedula, C. corax, C. corone, Alauda arvensis, Alcedo ispida, Accipiter nisus, Falco tinnunculus, Phalacrocorax carbo, P. graculus, Sula bassana, Ardea cinerea, Querquedula crecca, Columba palumbus, Charadrius pluvialis, Vanellus vulgaris, Hæmatopus ostralegus, Scolopax rusticula, Larus argentatus, L. fuscus, Rissa tridactyla, Alca torda, Colymbus arcticus, Podicipes griseigena.
