312 BULLETIN 186, UNITED STATES NATIONAL MUSEUM 



The wing lengths of seven Thai specimens range from 64.5 to 

 68.8 mm. 



PARUS XANTHOGENYS SUBVIRIDIS Blyth 



Tenasserimese Yellow-cheeked Tit 



Parus subviridis "Tickell" Blyth, Journ. Asiat. Soc. Bengal, vol. 24, 1855, p. 267 

 ("Mountainous interior of Tenasserini," where it seems to occur only on 

 Muleyit). 



Machlolophus spilonotus, Williamson, Journ. Nat. Hist. Soc. Siam, 1918, p. 15 

 (Doi Nga Chang). 



Parus spilonotus, Gyldenstolpe, Ibis, 1920, p. 468 (Doi Nga Chang). 



Machlolophus spilonotus subviridis, de Schauensee, Proc. Acad. Nat. Sci. Phila- 

 delphia, 1929, p. 528 (Doi Suthep). — Deignan, Journ. Siam Soc. Nat. Hist. 

 Suppl., 1931, p. 135 (Doi Suthep). 



Parus spilonotus subviridis, Chasen and Boden Kloss, Journ. Siam Soc. Nat. Hist. 

 Suppl., 1932, p. 246 (Doi Suthep). — de Schauensee, Proc. Acad. Nat. Sci. 

 Philadelphia, 1934, p. 180 (Doi Suthep). 



Machlolophus xanthogenys subviridis, Deignan, Journ. Siam Soc. Nat. Hist. 

 Suppl., 1936, p. 104 (Doi Suthep). 



Machlolophus spilonotus subviridis, Riley, U. S. Nat. Mus. Bull. 172, 1938, p. 312 

 (Doi Langka, Doi Hua Mot). 



With the addition of Doi Ang Ka and Doi Nang Kaeo, the localities 

 listed above give the entire Thai range of this form of the yellow- 

 cheeked tit, so far as it is now known ; on these mountains it is common 

 at the edge of the evergreen and in the open hill-forest from 3,300 to 

 5,500 feet. 



It is a social bird that travels in small parties through the bushes 

 and lower trees in company with nuthatches, tree creepers, and such 

 arboreal babblers as Mesia, S tecchy ris, and Aleippe. De Schauensee 

 observes (1929) that it makes the chattering sounds of other titmice 

 but, in addition, has a loud and cheerful song of three notes, resembling 

 the syllables chee-chee-pui, the first two of which are pitched the same, 

 while the third is accented and about two tones lower. 



A specimen from Doi Suthep, February 24, had the gonads greatly 

 enlarged. Numerous examples taken between August 26 and November 

 19 are in postnuptial molt. 



Adults have the irides brown ; the bill black ; the feet, toes, and claws 

 plumbeous-blue or slaty blue. 



This species is so typical a titmouse that a detailed description is 

 scarcely necessary. The adult male somewhat resembles the same sex 

 of the great tit but has a conspicuous black crest ; the forehead, nape, 

 and sides of the head and body bright yellow ; the back heavily streaked 

 with olive-green and black; the upper wing coverts black with bold, 

 white, apical spots. The adult female differs from the male in her 

 generally duller coloration and in the complete absence of black from 

 the underparts. 



