THE BIRDS OF NORTHERN THAILAND 149 



DUCULA BADIA GRISEICAPILLA Walden 



Burmese Mountain Imperial Pigeon 



Ducula griseicapilla Warden, Ann. Mag. Nat. Hist., ser. 4, vol. 16, 1875, p. 22S 

 (Karen Hills ; type series from "the Cineona plantations about 16 miles east 

 of Tonghoo," fide Wardlaw Ramsay, The Ornithological Works of Arthur, 

 Ninth Marquis of Tweeddale, 1881, p. 416). 



Ducula insignis griseicapilla, Gyldenstolpe, Journ. Nat. Hist. Soc. Siam, 1915, 

 p. 234 (listed) ; Ibis, 1920, p. 741 ("Northern, North-western Siam"). 



Ducula badia griseicapilla, de Schauensee, Proc. Acad. Nat. Sci. Philadelphia, 

 1929, p. 5S0 (Doi Suthep) ; 1934, p 272 (Khun Tan, Doi Suthep, Doi Chiang 

 Dao). — Deignan, Journ. Siam. Soc. Nat. Hist. Suppl., 1931, p. 166 (Doi 

 Suthep) ; 1936, p. 85 (Doi Suthep). — Chasen and Boden Kloss, Journ. Siam 

 Soc. Nat. Hist. Suppl., 1932, p. 232 (Doi Suthep).— Riley, U. S. Nat. Mus. 

 Bull. 172, 1938, p. 109 (Doi Aug Ka, Khun Tan, Doi Langka, Doi Kiu Chong). 



This handsome pigeon is very common on all the higher peaks of 

 the North, occurring in the evergreen and rarely seen below 3,000 feet. 



The mountain pigeon is the most numerous of its family in our high- 

 land forests, and its booming call, ngnm-rigum, from which the Lao 

 name is derived, carries far and can be heard constantly during the 

 day. It is usually found in pairs, but an abundance of food may 

 attract as many as a dozen to a single tree. It must range widely for 

 suitable fruits: I have constantly noticed it flying high above the 

 jungle at sunset, apparently headed for some habitual roosting place. 



A specimen taken on Doi Ang Ka, April 30, had the ovaries enlarged. 

 Birds of July 15 and 16 are beginning the postnuptial molt. 



A breeding female had the irides with an ashy-white inner, gray 

 outer ring; the bill dull purplish red, tipped violet-brown; the feet 

 and toes dull purplish red; the soles pale brownish gray; the claws 

 dark horny brown. 



This species has the crown gray ; the hindneck vinaceous-pink, deep- 

 ening on the back and changing gradually to brownish slate on the 

 wings and to slate on the rump and upper tail coverts; the tail slate 

 at the base and gradually changing to black but with a broad brown- 

 ish-slate terminal band; the throat whitish; the remaining underparts 

 gray, washed with pink on the breast and sides of the neck ; the under 

 tail coverts pale buffy. 



COLUMBA LIVIA INTERMEDIA Strickland 



Indian Blue Rock Pigeon 



Columba intermedia Strickland, Ann. Mag. Nat. Hist., vol. 13, 1S44, p. 39 (India; 



type locality restricted to Calcutta, apud Peters). 

 Columba livia intermedia, Deignan, Journ. Siam Soc. Nat. Hist. Suppl., 1931, p. 



167 (Chiang Mai) ; 1936, p. 85 (Chiang Mai). 



The common rock pigeon is a common and well-known species of the 

 towns and larger villages throughout the northern provinces. 



