Dalgleish on North American Birds in Europe. 67 
here to mention that an extensive series of observations on migra- 
tion, with reference particularly to the prevailing winds and weather 
at the periods of such, are at present being carried on in Great 
Britain, by Messrs. Cordeaux and Harvie-Brown, by means of returns 
kept by the keepers of the various light-houses on its coasts, with the 
sanction of the authorities, and with the co-operation of Herr Gatke 
at Heligoland by means of his observations there, and from which 
important results are expected. The first year’s report is to appear 
in the “ Zoologist” for May of this year. 
I have not ventured, on the other hand, to enter into any dis- 
quisition respecting the authenticity of the various records, but I 
have stated the doubts which have been thrown on some of these 
by others better qualified to give an opinion. I have considered it 
better to include such, with the doubts alluded to stated, rather 
than to omit these altogether, however well founded the latter 
may be. 
I have had some difficulty in determining which species should 
be included as North American birds, but, with two exceptions, I 
have excluded all those which appear in Bonaparte’s “ Comparative 
and Geographical List of the Birds of Europe and North America ” 
(1838) as common to both continents. These exceptions are Surnia 
funerea and Clangula kistrionica, the former being now considered 
as a distinct species from S. ulula, the European Hawk-Owl, and 
the latter I have retained, as Iceland is the only part of Europe 
where it may be said to be a permanent resident. I have also 
added a note of the occurrence of three species which, although not 
strictly North American, are yet oceanic in their distribution, and 
thus occur more or less irregularly on the shores of that continent, 
and whose appearance, moreover, in Eurdpe is worthy of notice. 
These are Sterna fuliginosa and S. aneestheta, the Greater and 
Lesser Sooty Terns, and Anous stolidus , the Noddy Tern. 
The various countries which have been visited by the different 
species are placed in the same sequence throughout, and the occur- 
rences in chronological order. The names of these countries are, 
for easy reference, printed in heavier type, and the date of each oc- 
currence, so far as known, is placed at the end of the record in simi- 
lar type. 
In some cases I have avoided general notices by authors where 
no particulars are given of the locality or date, believing that such 
are of no practical value. The references given are to the original 
