THE BIRDS OF NORTHERN THAILAND 335 



olivaceous suffusion ; the flanks ashy, suffused with olivaceous-brown ; 

 the bend of the wing, the under tail coverts, and the region of the vent 

 bright yellow, this color sometimes faintly invading the albescent 

 lower abdomen. 



Riley's recently taken series of eous (Annam) were compared with 

 aged and discolored specimens of flnlaysoni, and I believe that the 

 supposed differences would not have appeared had he seen truly 

 comparable material. There is some chance, however, that the pop- 

 ulation of northern Thailand and Indochine will prove separable 

 from flnlaysoni by their rather longer wing ; I have unfortunately not 

 examined enough skins to settle this point. 



PYCNONOTUS FLAVESCENS VIVIDUS (Stuart Baker) 



Tenasserimese Flavescent Bulbul 



Xanthiscus [sic] flavescens vivida [sic] Stuart Bakek, Bull. Brit. Orn. Club, 



vol. 38, 1917, p. 16 (Salwin ; Mount Muleyit). 

 Xanthixtis flavescens vivida [sic], Williamson, Journ. Nat. Hist. Soc. Siam, 



191S, p. 19 (Doi Nga Chang). 

 Xanthiscus [sic] flavescens vivida [sic], Gyldenstolpe, Ibis, 1920, p. 492 (Doi 



Nga Chang). 

 Xanthixus flavescens vividus, de Schauensee, Proc. Acad. Nat. Sci. Philadelphia, 



1929, p. 539 (Doi Suthep) ; 1934, p. 202 (Doi Suthep, Doi Chiang Dao).— 



Riley, U. S. Nat. Mus. Bull. 172, 1938, p. 384 (Doi Aug Ka, "Ban Ta Pai," 



Khun Tan, Doi Langka, Doi Hua Mot). 

 Xanthixus flavescens flavescens, Chasen and Boden Kloss, Journ. Siam Soc. 



Nat. Hist. Suppl., 1932, p. 242 (Doi Suthep). 

 Pycnonotus flavescens vividus, Deignan, Journ. Siam. Soc. Nat. Hist. Suppl., 



1936, p. 110 (Doi Suthep). 

 Xanthixus flavescens berliozi, Gkeenwat, Bull. Mus. Comp. Zool., 1940, p. 175 



(DoiAngKa). 



The flavescent bulbul is a bird of the brush and grasslands at eleva- 

 tions in excess of 3,500 feet ; it is common, or even abundant, at suitable 

 places on all the higher peaks of the North (including Phu Kha). 

 On Doi Suthep it abounds along the highest ridges in the lalang and 

 stunted trees, is common among the pines on the northern face of the 

 mountain, and occurs in small numbers at an ancient hai in the ever- 

 green near H. B. M. Consul's bungalow. 



As it travels in loose bands through the thickets, tall grass, and 

 lowest branches of the smaller trees, this species attracts attention 

 to itself by its own curiosity ; while at the first alarm the members of 

 the flock seek shelter in the densest undergrowth, whence only soft, 

 cheeping notes give evidence of their presence, first one, then another, 

 comes up to investigate the disturbance — ruffling the crown feathers 

 and nervously twitching the tail for a moment, before diving again 

 into the concealing vegetation. 



A male shot on Doi Ang Ka, April 17, had the gonads greatly en- 

 larged. A specimen in late postnatal molt was taken April 7 on 



