I' KEF ACE. 



THE Comparative List of Birds of Rome and Philadelphia, 

 which was first published in the 33rd No. of the " Nuovo 

 Giornale de j Letterati," arid printed as a separate Tract at Pisa 

 in 1827, having met with the kind attention of several eminent 

 Ornithologists, both in this country and on the Continent, I 

 have been induced to publish on the same plan, a general enume- 

 ration of the Birds of Europe and North America, which, besides 

 giving the comparative Ornithology of these two regions, con- 

 tains the most complete list hitherto published of the Birds of 

 each, arranged under their respective Genera and Tribes accord- 

 ing to the present state of Ornithology. 



The Genera are arranged in these lists in Families and 

 Tribes according to the general system of Birds on which I have 

 been long engaged, and which I now hope very shortly to bring 

 before the Public. It is necessary to make this remark, as some 

 of the groups may not appear to follow in their most natural 

 order, if the Birds in the list are alone taken into consideration ; 

 but this arises from my series of affinities being filled up and 

 completed by Birds which are not found cither in Hurope or 

 North America. 



