THE BIRDS OF NORTHERN THAILAND 493 



Examples with the gonads enlarged were taken at Chiang Mai, 

 May 21, and at Ban Mae Klang, August 30. Birds in full winter 

 dress have been collected between January 18 and February 20 (Doi 

 Suthep, Doi Khun Tan) ; in complete prenuptial molt, between Feb- 

 ruary 25 and June 8 (Phu Het, Doi Ta Kong, Doi Khun Tan) ; in 

 full summer dress, between May 21 and August 30 (Chiang Mai, Ban 

 Mae Klang, Ban Mae Mo) ; in complete postnuptial molt, between 

 August 29 and November 25 (Doi Hua Mot, Doi Khun Tan, Chom 

 Thong, Doi Chiang Dao). A specimen from Doi Hua Mot, August 

 20, shows postnatal molt; another from Ban Mae Mo, August 25, 

 wears full juvenal plumage. 



A breeding male, May 21, had the irides bright brown; the bill 

 blackish; the feet and toes fleshy yellow. Winter-taken examples 

 differ in having the bill horn color. 



In nuptial plumage, the adult of either sex has the front, crown, 

 and nape brownish slate; the mantle dark rufous-brown; the wings 

 dark rufous; the graduated rectrices dark rufous above, ashy brown 

 beneath, with a rufous-gray tip and a black subterminal spot; the 

 well-marked supraloral streak (often continued beyond the eye as 

 a short supercilium) and the tiny feathers of both eyelids white; 

 the underparts white, washed with buff, most strongly along the 

 flanks and on the thighs and under tail coverts. In winter, it differs 

 in having the front, crown, and nape rufous-brown, tinged with slate ; 

 the mantle bright rufous-brown; the underparts white, washed with 

 rufous-buff, most strongly along the flanks, over the greater part of 

 the abdomen, and on the thighs and under tail coverts. Juveniles 

 have the posterior underparts strongly washed with creamy yellow. 



PRINIA INORNATA BLANFORDI (Walden) 



Burmese Plain-colored Prinia 



Drymoeca blanfordi Walden, in Blyth, Catalogue of the mammals and birds of 



Burma, Journ. Asiat. Soc. Bengal, vol. 43, pt. 2, extra no., 1875, p. 118 (Toun- 



goo, Burma). 

 Prinia inornata burmanica, Deignan, Journ. Siam Soc. Nat. Hist. Suppl., 1931, 



p. 150 (Chiang Mai) ; 1936, p. 118 (Chiang Mai).— -de Schaxjensee, Proc. Acad. 



Nat. Sci. Philadelphia, 1934, p. 232 (Chiang Mai). 

 Prinia exter, Riley, U. S. Nat. Mus. Bull. 172, 1938, p. 443 (Ban Nam Khian). 



A form of the plain-colored prinia that, on the basis of fine-plumaged 

 January specimens, may quite safely be called blanfordi, is a very 

 common permanent resident of the rice plain at Chiang Mai. The 

 species is otherwise known from our area only by two summer ex- 

 amples from Muang Fang (Mae Khong drainage) and one from Ban 

 Nam Khian, which cannot, at this time, be subspecifically identified 

 with any degree of certainty. 



