66 NILS GYLDENSTOLPE, ZOOLOGICAI. RESULTS OF THE SVVEDISH ZOOLOGICAL EXPEDITIONS TO SIAM. 



The Fairy Blue-BLrd was fairly common in heavy jungle in the Northern parts of 

 the country, but never met with, as far as I can remember, in the Siamese Malaya. I 

 ne ver found it in flocks as stated by Davison (Stray Feathers. Vol. 6 p. 328. 1878) but 

 always in pairs or single. 



The young males are similar in plumage to the females and they change into 

 adult plumage without a moult. Some specimens collected at the end of April and in 

 May ha ve their upper plumage bluish green — like the females — but some feathers on 

 the crown, upper back and the lower tail-coverts are tipped with glistening cobalt like the 

 adult bird. Underparts of the body almost black, some of the feathers being tipped with 

 bluish green. 



It therefore seems that the underparts of the body are changing into their definite 

 colour in a way opposite to the upper parts of the body, which get their new colour from 

 the tips, while the underparts get their new colour from the bases of the feathers. 



116. Hypsipetes concolor yunnanensis. Anders. — Anderson's Black Bulbul. 



IFi/psipetcs concolor: Gyldenstolpe III p. 166. 



$ Koon Tan 4 /c 1914. L = 233 mm.; W = 123 mm.; T = 114 mm.; C = 22 mm.; Tarsus = 10 

 mm. — J 1 Koon Tan, May 1914. W = 113 mm.; T = 101 mm.; C = 20 mm. -- Irides: brown. Bill: brick 

 red. Legs: brick red. 



Fairly rare and only obtained in the hillforests of the Koon Tan mountain range. 

 When observed it was always in small parties haunting old clearings, and as the birds 

 were rather shy they were difficult to obtain. 



The race found in Northern Siarn is the same one which was described from 

 Yunnan by Anderson in his remarkable work »Anatomical and Zoological Researches of 

 the two Expeditions to Western Yunnan 1868 and 1875. 



My specimens ha ve their heads decidedly darker than the mantle, and a greenish 

 gloss on the pointed crest-feathers; middle of back, rump and upper tail-coverts dusky 

 black, the feathers edged with dar k slaty grey; abdomen and under tail-coverts ashy 

 grey, the latter a little darker and tipped with white; below the ear-coverts a black spöt; 

 wing-coverts, primaries and rectrices blackish brown edged with slaty grey. 



117. Microtarsus melanocephalus. Gm. — The Black-headed Bulbul. 



Micropus melanocephalus: Gyldenstolpe 1 p. 27; Kobinson & Kloss p. 57; Robinson II p. 148. 

 Prosecusa melanocephala: Mttller p. 381. 



£ Koh Lak is /ia 1914. L == 1G0 mm.; W = 79 mm.; T = 75 mm.; C = 12 mm. — Irides: påle 

 blue. Bill: black. Legs: black. 



The Black-headed Bulbul seems to be very locally distributed in Siarn at least in 

 the parts of the country visited by my Expedition. 



During the whole journey I only observed it at the neighbourhood of Koh Lak i ti 

 the Siamese Malaya, but down there it was fairly common occuring together with some 

 other kind of Bulbuls such as Pycnonotus blanjordi, Jerd., Aegilhina tiphia Linn. a. s. o. 



