344 BULLETIN 18 6, UNITED STATES NATIONAL MUSEUM 



Hypsipetes concolor, Gyldenstolpe, Journ. Nat. Hist. Soc. Siam, 1915, p. 166 

 (listed). 



Hypsipetes concolor yunnanensis, Gyldenstolpe, Kungl. Svenska Vet.-Akad. 

 Handl., 1916, p. 66 (Khun Tan) ; Ibis, 1920, p. 491 (Khan Tan). 



Microscelis psaroides concolor, de Schatjensee, Proc. Acad. Nat. Sci. Philadel- 

 phia, 1929, p. 538 (Doi Suthep) ; 1934, p. 201 (Doi Suthep, Doi Chiang Dao, 

 Doi Khun Tan). — Deignan, Journ. Siam Soc. Nat. Hist. Suppl., 1931, p. 139 

 (Doi Suthep) ; 1936, p. 109 (Doi Suthep).— Riley, U. S. Nat. Mus. Bull. 172, 

 1938, p. 379 (Doi Ang Ka, Doi Suthep, Doi Khun Tan, Doi Langka, Doi Hua 

 Mot). 



Microscelis leucocephalus concolor, Chasen and Boden Kloss, Journ. Siam Soc. 

 Nat. Hist. Suppl., 1932, p. 243 (Doi Suthep). 



The Tenasserimese black bulbul is a common species of the ever- 

 green on the Thanon Thong Chai and Khun Tan chains, at eleva- 

 tions between 2,900 (Doi Suthep) and 8,000 feet (Doi Ang Ka). 



The movements of this bird are largely governed by the antheses of 

 such nectariferous trees as Cassia and Bomb ax, so that, while it is a 

 permanent resident of the two ranges named above, it is at the same 

 time highly erratic in its appearances and numbers at a given locality. 

 Occurring in flocks, great or small in proportion to the abundance 

 of desirable food, it usually keeps to the tops of quite high trees, in 

 clearings or at the edge of the forest. Whether flying or at rest, it 

 is one of the most clamorous of its family and is almost impossible 

 to overlook. 



A female from Doi Suthep, February 13, had the gonads enlarged. 

 Smith took a specimen in advanced postnatal molt on Doi Langka, 

 May 2; de Schauensee reports (1934) a juvenile from Doi Suthep, 

 July 22. Postnuptial molt appears in examples collected between May 

 12 and August 29. 



Adults have the irides brown; the bill, interior of the mouth, 

 tongue, feet, and toes bright coral red; the claws horny brown. 



Old birds have the lanceolate feathers of the front and crown black, 

 glossed with steel blue; the remaining upperparts bluish slate (the 

 mantle more or less strongly suffused with blue-black) ; the feathers 

 of the wings and tail black, their exposed portions narrowly edged 

 with bluish slate; a spot below the anterior ear coverts glossy black 

 (this color sometimes continued as a narrow line beneath and behind 

 the ear coverts) ; the remaining underparts slaty gray, paler poste- 

 riorly (the feathers of the center of the abdomen sometimes edged 

 with white) ; the under tail coverts slaty gray, always narrowly 

 fringed with white. 



microscelis madagascariensis leucothorax mayr 



Szechwanese White-headed Black Bulbul 



Microscelis leucocephalus leucothorax Mayr, Journ. fur Orn., vol. 89, 1941, p. — 

 ("Chung Chiang Miao, [W ?] Szetschwan"). 



