INTRODUCTION. XXXIX 



Table X. 



Comparative View of the number of Species in the neighbourhood of Philadelphia, on the 

 Banks of the Saskatchewan, in the 64th parallel, in the Arctic Islands, and in the Fur 

 Countries in general. 



t,. ., , ,;.,,, In the Arctic Fur Countries 



rmiaa. 5>asKatcn. 64th parallel. Islands. in general. 



Lat.40°. Lat. 54°. Lat.74° 



Resident, and of course breeding . 44 24 16 40 



Migratory, that summer or breed . 60 117 87 34 198 



„ that winter only 71 1 



,, that pass in spring or autumn 55 37 10 



,, doubt if they breed or pass merely 8 



Accidental visiters . . 51 2 



281 189 113 34 238 



This summary shews, that the number of species which are known to rear 

 their young on the banks of the Saskatchewan amount to 141, while there 

 are only 104 species enumerated as breeding in the vicinity of Philadelphia, 

 where ornithology has been so much more thoroughly investigated. It also 

 appears that as great a variety of birds breed in the 64th parallel as in the 

 40th. The number of species that arrive from the north merely to winter in 

 Pennsylvania exceeds those that come from the south to breed there ; while 

 the birds that simply pass on their way to the north nearly equal the latter. The 

 resident birds diminish gradually as the latitude increases. 



Table XI. 



List of Species common to the Old World and to the Fur Countries. 



Falconid^. Aquila chrysaeta, A. (Haliseetus) leucocephala, A. (Pandion) haliaeeta, Falco 

 peregrinus, F. islandicus, F. sesalon, Accipiter (Astur) palumbarius, Buteo vulgaris, 

 B. lagopus, B. (Circus) cyaneus. 



Strigid^e. Strix otus, St. brachyota, St. nebulosa, St. nyctea, St. funerea, St. Tengmalmi. 



Sylviad^:. Parus atricapillus, An thus aquaticus. 



Ampelid.&. Bombycilla garrula. 



Fringillid^;. Alauda calandra? A. cornuta, Emberiza (Plectrophanes) nivalis, E. (PI.) 

 Lapponica, Pyrrhula (Corythus) enucleator, Linaria minor. 



CorvidjE. Corvus corax, C. corone, C. pica. 



