references to some of the works in which the several species 

 are mentioned or described^ and especially to those which 

 contain information likely to prove useful to the ornitho- 

 logical student as to the habits of the birds and their geogra- 

 phical distribution, but for the most part excluding articles 

 already referred to in my Notes. I have also given, where 

 possible, references to at least one figure of each species. In 

 the fourth column I have recorded the number of specimens 

 of each species preserved in the Norwich Museum, in the 

 hope of drawing attention not only to the interesting 

 collection which there exists, but also to its desiderata, and 

 of facilitating the acquisition of these, which I am anxious 

 to promote, both as regards the collection of Diurnal Rap- 

 tores and also of the Strigidse, in Avhich group the Norwich 

 Museum is already almost equally rich. 



Since my Notes on Mr. Sharpens volume were published 

 in the ' Ibis,^ I have seen occasion to modify my views as 

 regards a few species, and have obtained additional infor- 

 mation as to some others ; and these results I have added to 

 my present list in the form of footnotes, or, when too lengthy 

 to be so introduced, in the shape of Appendices. 



For the sake of convenience, I did not deviate much in my 

 Notes from the arrangement adopted by Mr. Sharpe ; but in 

 the present list I have consulted my own views as to the 

 most natural or, perhaps I should rather say, the least 

 unnatural arrangement which I could adopt. 



Every individual species being the centre of a group of 

 approximate forms which resemble it in various degrees, it 

 is obvious that a serial arrangement can only record with 

 precision the connection of each genus and of each species 

 with two of the forms which are thus grouped around it, 

 and is therefore so far imperfect that it must of necessity 

 disregard other natural connections^ the existence of which 



