18 
the constructor of the nest might be an enormous Owl ; and if so, 
the cause of the bird being never seen, whilst the nests were not 
scarce, would be from its not going out until dark ; but from the 
very open and exposed situations in which the nests were found, I 
should rather judge it to be of the Eagle kind ; and that its powers 
are such as to render it heedless of any attempts of the natives upon 
its young.” — Flinders’ Voyage, vol. i. pp. 64 and 81. 
The accumulation of so large a mass of materials is readily ac- 
counted for when we remember that the bird is in the habit of re- 
sorting to the same eyry for a long succession of years, and of 
annually carrying additional materials to reconstruct the nest. 
I myself found and took young birds of this species from similar 
nests placed on the points of rocks and promontories of the islands 
in Bass’s Straits. 
Genus Haliastur. 
The range of the members of this genus extends over Australia 
and all the islands to India. 
4. Haliastur leucosternus, Gould Vol. I. PI. 4. 
Falco ponticerianus , Shaw, Nat. Misc., pi. 389. 
Haliaetus ( Ictinoaetus ) leucosternon , Kaup, Isis, 1847? p. 276. 
Confined, so far as I am aware, to Australia, and forming a beau- 
tiful representative of the Haliastur 'ponticerianus of India. 
5. Haliastur sphenurus Vol. I. PI. 5. 
Milvus sphenurus , Swains. Class, of Birds, vol. ii. p. 211. 
Haliaetus (Ictinoaetus) canorus , Kaup, Isis, 1847? p. 277. 
Inhabits all parts of Australia yet visited by travellers, even the 
Depot in the interior. 
Genus Pandion. 
Of the genus Pandion four species are now known ; one inhabit- 
ing America, another Europe and Asia, a third the Indian Islands, 
and the fourth Australia. 
6. Pandion leucocephalus, Gould Vol. I. PI. 6. 
Pandion Gouldii , Kaup, Isis, 1847? p. 270. — List of Birds in 
Brit. Mus. Coll., Part I. 2nd edit. p. 22. 
This species of Pandion performs precisely the same office in 
Australia that the P. haliaetus does in Europe and the P. Caroli- 
nensis in America; to both of which species it is very nearly allied. 
Genus Falco. 
As they are the most typical of all the Hawks, so are the members 
of the genus Falco the most universally dispersed over the face of 
the globe ; and I question whether the law of representation is in 
any case more beautifully and clearly shown than by the members 
of the present group. 
7. Falco hypoleucus, Gould Vol. I. PI. 7. 
Up to the present time only four examples of this fine Falcon have 
