66 NILS GYLDENSTOLPE, ZOOLOGICAL RESULTS OF THE SWEDISH ZOOLOGICAL EXPEDITIONS TO SIAM. 
The Fairy Blue-Bird 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 
never 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 have 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. ANprers. — Anderson’s Black Bulbul. 
Hypsipetes concolor: Gyldenstolpe III p. 166. 
@ Koon Tan 4/6 1914. L = 233 mm; W = 123 mm.; T= 114 mm.; C = 22 mm.; Tarsus = 16 
mm. — ¢ 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 Siam 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 have 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 dark slaty grey; abdomen and under tail-coverts ashy 
grey, the latter a little darker and tipped with white; below the ear-coverts a black spot; 
wing-coverts, primaries and rectrices blackish brown edged with slaty grey. 
117. Microtarsus melanocephalus. Gm. — The Black-headed Bulbul. 
Micropus melanocephalus: Gyldenstolpe I p. 27; Robinson & Kloss p. 57; Robinson II p. 148. 
Prosecusa melanocephala: Miller p. 381. 
3 Koh Lak /i2 1914. L = 160 mm; W = 79 mm; T= 75 mm; C = 12 mm. — Irides: pale 
blue. Bill: black. Legs: black. 
The Black-headed Bulbul seems to be very locally distributed in Siam 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 in 
the Siamese Malaya, but down there it was fairly common occuring together with some 
other kind of Bulbuls such as Pycnonotus blanfordi, JERD., Aegithina tiphia Linn. a. s. 0. 
