[79]

Birds of New Zealand, 2nd ed. ii. London, 1888, pp. 154-160.

[80]

The Chatham Island bird is P. onslowi of H. O. Forbes (Ibis, 1893, p. 537), who discusses various other species. The American forms need further study.

[81]

P. L. Sclater, P.Z.S. 1882, p. 458.

[82]

Freeman and Salvin, Falconry, its claims, etc., London, 1859, pp. 327-349.

[83]

W. A. Forbes, P.Z.S. 1882, p. 210.