X INTRODUCTION 



Sterna ani&stheta, 1 Procellaria castro. 1 



(doubtful) (piclced up dead) 



Pufflnus assimilis, 3 Pelagodroma marina, 2 



„ griseus,lZ (one found dead) 



Of the foregoing thirty odd species, the ma- 

 jority of those which have occurred but once 

 in so many years, e.g. Elanus caeruleus, Lanius 

 meridionalis, Sylvia suhalpina, Phylloscopus viri- 

 danus, Emheriza cioides, Butorides virescens, Sterna 

 aniestheta, and Pelagodroma marina, are mere waifs 

 and strays, and may never occur again. Of the 

 rest, a few may possibly do so, either because 

 they are migratory over an extensive area, or be- 

 cause their breeding haunts are not too remote 

 from the British Islands. In the former of these 

 two categories might be placed Falco gyrfalco, 

 LaniiiH major, Turdus /tnigratorius, Charadritis 

 fulvus, and Tringa acuminata ; in the latter, Sylvia 

 nisoria, Fringilla serimis, Linota exilipes, Pujfjinus 

 assinfiihs, and P. griseus. The appearance of the 

 two small American land birds Carduelis tristis and 

 Zonotrichia alhicollis is probably attributable to 

 their having escaped from captivity. 



One of the most noteworthy facts marking the 

 progress of ornithology in England during the last 

 quarter of a century, has been the repeated detec- 

 tion in the eastern counties of many species of 

 small warblers from the Continent which make 

 their appearance in autumn, and may perhaps be 

 found to do so annually now that they have been 



