40 RAPTORIAL BIRDS 
habits Iceland, Greenland, and the arctic portion of 
the mainland of North America, has been named 
falco islandicus, or the Iceland Falcon. There are, 
however, some slight differences in the plumages of 
the Grey Falcons which are included under the latter 
appellation, and these, in the opinion of some 
Naturalists, are sufficient to subdivide the western 
Grey race into three distinct races—the Icelandic, 
the Greenlandic, and the Labrador. 
Both the White Gyr-Falcon, and also the Grey Gyr- 
Falcons of Iceland and of Scandinavia, occasionally, 
but very rarely, occur in Great Britain as winter 
visitors. 
We have dwelt at some length on the typical 
_ Falcons as forming a genus to which, from its associa- 
tions with ancient falconry, great interest attaches, 
and must now pass on to the family of Buzzards, a 
widely-spread group of birds of prey, somewhat re- 
sembling the Falcons in their general form, but greatly 
inferior to them in power of flight and general vigour, 
courage, and activity; in consequence of which the 
Buzzards prey less upon the larger gallinaceous and 
aquatic birds, than is the habit of the typical Falcons, 
and more upon the smaller quadrupeds and reptiles. 
The Buzzards are arranged in four genera, Archi- 
buteo, Luteo, Tachytriorchis, and Leucopternis. The 
first of these contain the Rough-legged Buzzards, so 
called because, in them only, the tarsi are clothed 
with feathers—not all round the leg as in the 
