Two articles disbound from 'The Ibis: A Quarterly Journal of Ornithology,' Volume IV, Twelfth Series, 1928. In two parts. January 1928 and April 1928. Article IV, pp. 23-51 and Article XVII, pp. 285-317. With notes by P. Jabouille and W.P. Lowe. Six colored plates after Gronvold, 3 b&w plates of photos, and 1 folding map.