16G SIXTH UKl'ORT — 1836. 



ized by Mr. Swainson in the PMlosojihical Magazine for 1827, 

 and upwards of one hundred and thirty named by Lichtenstein 

 appear in the sale-list of duplicates of the collection made for 

 the Berlin Museum by Herren Deppe and Schiede. As the 

 authors of these two lists do not appear to have been aware of 

 each other's labours, some of the species are probably twice 

 named ; and as we have no means of knowing whether many of 

 these Mexican birds pass the tropic, or at least frequent the 

 elevated table-lands, so as properly to enter the North American 

 fauna, all their names are put in italics. The other parts of the 

 lists have been compiled chiefly from Audubon's work ; and 

 that I might be enabled to refer to the species which will be 

 comprised in the fourth volume, he has obligingly furnished me 

 with a list of the plates which it will contain. Additions are made 

 from the other works already quoted. The arrangement' adopted 

 is that proposed by Mr. Vigors, with Mr. Swainson's alterations. 

 The extreme range of each species as far as ascertained is noted, 

 and the birds which have been actually detected in Mexico or 

 California are distinguished by abbreviations of the names of 

 these countries. 



The similarity of the North American ornithology to that of 

 Europe is evinced not only by the identity or close resemblance 

 of the generic forms, but also by a third part of the species 

 being common to the two faunae. Europe is visited by a few 

 of the meropidcE, jjromeropidce, and struthionidce, families 

 which have no members in North America ; the muscicapidce, re- 

 presented in Europe by four species, which go pretty far north, 

 furnish to the American fauna only the todus viridis and psaris 

 cay amis, w\\\c\\ do not ascend higher than Mexico ; butthis family 

 is amply replaced in America by the tyrammlce, which, though ar- 

 ranged by Mr. Swainson as part of the Z««2arf<^, were considered by 

 previous writers as fly-catchers, and scarcely to be separated from 

 the Linnean genus muscicapa. North America, on the other hand, 

 enumerates in its fauna certain families not found in Europe, viz., 

 the trochilidcB, psittacidce, rhamphastidfs, and trogonidce, but 

 none of the two latter groups go st* far north as to reach the paral- 

 lel of the south of Europe. The subjoined tablehasbeen construct- 

 ed to show at a glance the chief points of agreement or difference 

 between the two faunae, the terms of comparison being assimi- 

 lated by the omission of the American species which do not attain 

 the 36th parallel of latitude. The number of species which 

 compose the cori-esponding groups of each fauna often coincide 

 remarkably, and this occurs even in families which have few or 

 no species common to each country. There is a discordance 

 with this remark observable in some families of denfirostres, 

 which is perhaps owing to my imperfect arrangement of the 

 species. The agreement between the faunae is greatest among 



