(1859) Columba leuconota gradaria.
THE TIBETAN SNOW-PIGEON.
Columba leuconota gradaria Hartert, Nov. Zool., 1916, p. 85 (Szetchuan). Columba leuconota. Blanf. & Oates, iv, p. 32 (part.).
Vernacular names. Lho-peu-rentiep (Lepcha) ; Bya-don (Bhut.).
Description. Head paler and more slate-grey than in the Western Snow-Pigeon; the mantle paler and more grey, less brown; the wing-coverts are also paler.
Colours of soft parts as in the preceding bird.
Measurements. Wing 239 to 262 mm.
Distribution. North-West China, Szetchuan and Kansu, South Tibet and West to Sikkim; Yunnan.
Nidification. I have eggs of this race taken from Eastern Tibet and others taken from near Gyantse," probably between Rhamtso Lake and Gyantse, said to have been taken from nests in cliffs similar to those of the preceding bird. Capt. Stein, I. M. S., was the first to take the eggs, which he sent to Dresser; these also were taken " near Gyantse " and since then they have been taken in great numbers from further South. The eggs only differ from those of C. l. leuconota in being larger on an average, twenty eggs averaging 30.9 x 28.9 mm.
Habits. Similar to those of the preceding bird. Bailey found this bird mixing with the Rock-Pigeon on the Gyantse Plain * and records eight being shot there.
* Meinertzhagen's remarks on this Pigeon ('Ibis,'1927, p. 619; were probably written in India, where he had no access to the literature on the subject.