490 BULLETIN 186, UNITED STATES NATIONAL MUSEUM 



The yellow-bellied tailorbird, until now recorded in northern Thai- 

 land only from Doi Ang Ka, Doi Chiang Dao, and Phu Kha, is an 

 uncommon resident of the evergreen between 4,400 and 5,500 feet. 



I have found it singly or in pairs on the steep slopes of ravines, in 

 the lalang of abandoned hai, and along the trails in deep, damp forest. 

 In all its actions it is quite like the species of the lowlands. 



A bird taken September 4 on Doi Ang Ka is in postnuptial molt; 

 another collected two days later at the same locality is in postjuvenal 

 molt. 



An adult female had the irides brown; the maxilla dark horny 

 brown ; the mandible with the basal half horny yellow, the apical half 

 dark horny brown ; the feet and toes fleshy yellow ; the claws brownish 

 horn. 



The adult has the forehead and crown bright orange-rufous, chang- 

 ing to dark olive-green on the occiput ; a broad nuchal band slaty gray ; 

 the remaining upperparts dark olive-green ; the remiges and rectrices 

 brown, edged along the outer web with olive-green, the two outer pairs 

 of tail feathers with the whole inner web white ; a narrow supercilium 

 ashy white (bright yellow immediately above the eye) ; the lores and 

 an indistinct postocular streak blackish; the sides of the head and 

 neck otherwise slaty gray, like the nape ; the chin, throat, breast, and 

 center of the upper abdomen ashy white, the gray bases of the feathers 

 showing through in places ; the remaining underparts bright yellow ; 

 the thighs dark olive-green. The juvenile differs from the adult in 

 having the crown and nape dark olive-green, like the remaining upper- 

 parts ; a narrow olive-yellow supercilium ; the white of the chin, throat, 

 and breast washed with pale olive-green. 



PRINIA HODGSONII ERRO Deignan 



Thai Gray-breasted Prinia 



Prinia hodgsonii erro Deignan, Smithsonian Misc. Coll., vol. 103, No. 3, 1942, 



pp. 6-7 (Chiang Mai, North Thailand). 

 Franklinia gracilis, de Schauensee, Proc. Acad. Nat. Sci. Philadelphia, 1928, p. 



563 (Chiang Mai ) .—Deignan, Journ. Siam Soc. Nat. Hist. Suppl., 1931, p. 149 



(Chiang Mai) ; 1936, p. 115 (Chiang Mai). 

 Franklinia gracilis [partini], de Schauensee, Proc. Acad. Nat. Sci. Philadelphia, 



1934, p. 229 (Chiang Mai [partim], Doi Chiang Dao).— Riley, U. S. Nat. 



Mus. Bull. 172, 1938, p. 427 (Chiang Mai, Doi Langka). 



Owing to the difficulty attendant upon distinguishing in the field 

 between the nearly allied P. r. rufescens and the present species in 

 winter dress, the ranges of the two must be defined from actual museum 

 specimens. These indicate that erro is common on the Chiang Mai 

 plain but is otherwise found only on a few of the higher mountains : 

 on Doi Ang Ka at 4,400 feet, on Phu Kha at 4,500 feet, and on Doi 



