IV 



PREFACE. 



Of the eight birds described and named as new by 

 Forster at the end of this memoir, six, according to the 

 most recent authorities on North American birds, are 

 entitled to remain under Forster's designation, namely, 



Falco safer, Forst. =Hierofalco gyrfalco var. sacer (Forst.) 

 Strix nebulosa, Forst. = Syrnium nebulosum (Forst.) 

 Emberiza leucophrys, Forst. = Zonotrichia leucophrys (Forst.) 

 Muscicapa striata, Forst. = Dendrceca striata (Forst) 

 Parus hudsonicus, Forst. = Parus hudsonicus (Forst.) 

 Scolopax borealis, Forst. = Numenius borealis (Forst. ) 



But it has been pointed out to me by Prof. Newton . 

 and, I think, correctly, that the species described by Forster 

 as Falco sacer is not the American form of Hierofalco 

 gyrfalco as commonly supposed, but Astur atricapillus. 



Of the remaining two species described in the Appendix, 

 Fringilla hudsonias of Forster is usually identified with 

 Junco hy emails (Linn.), and his Anas nivalis with A user 

 Jiyperboreus (Pallas). 



Falco spadiceus, shortly mentioned as a new species 

 in the first part of the memoir (p. 383), is commonly 

 referred to Circus hudsonins (Linn.). 



P. L. S. 



ii, HANOVER SQUARE, LONDON, W. 

 March list, 1882. 



