IN THE NORWICH MUSEUM. 39 
equally rare Australian species which form the fifth 
group. One of these Australian Falcons is of a uni- 
form dark brown colour, and bears the name of Falco 
subniger ; the other species is grey, and is called Falco 
hypoleucus. Falco hypoleucus has not been found be- 
yond the limits of Australia, but Falco subniger is said 
also to have been obtained in New Zealand. 
The only remaining group of typical Falcons con- 
sists of those which inhabit the most northern parts 
of Europe, Asia, and America, and bear the name of 
Gyr-Falcons. 
These are the largest and most powerful of the 
Falcons, and were the most highly valued of any that 
were anciently used for purposes of falconry. 
The most beautiful of the Gyr-Falcons is that in 
which the ground colour is white, and which bears the 
name of Falco candicans. This species is found mofé 
or less frequently in all the most northern countries 
of the globe, but it appears to be most numerous in 
Greenland, where it breeds, and in Iceland, where it 
occurs during the winter months. 
The northern portions of the Old and New Worlds 
also possess Gyr-Falcons, in which the ground colour- 
ing, instead of being white, as in Falco candicans, is of 
a dark grey. These grey Gyr-Falcons are divided 
into two species, the race which is found in Northern 
Europe and probably in Northern Asia also, having 
received the name of falco gyrfalco, or the Norway 
Falcon, whilst the somewhat larger race, which in- 
