[139]

Cf. North, Nests and Eggs of Australian Birds, Sydney, 1889, pp. 11-13.

[140]

Cf. Ibis, 1879, pp. 413, 414.

[141]

Professor Newton and other writers seem to consider that the true Gyr-Falcon only inhabits Scandinavia and H. candicans Greenland and Arctic America; but this does not preclude occurrences elsewhere. Cf. however, Ibis, 1889, pp. 143-144.

[142]

Cf. H. Gadow, Bronn's Thier-Reich, Aves, Syst. Theil. 1893, pp. 160-164.

[143]

H. Gadow, Bronn's Thier-Reich, Aves, Syst. Theil. 1893, p. 176.