194 BIRDS OF THE 
the white pattern on the tail-feathers and the absence of the 
isabellina superciliary stripe. Wing 8 cm., tail 5,3—5,5; 
tarsus 2, culmen 1,8. 
Two fledged young birds (of and 9), killed. April 
24 and 5th, probably just after having left their nest, are 
dark brown, back and wing-coverts with a large rusty 
brown subterminal spot on each feather; the quills broadly 
margined with the same rusty brown, which color predomi- 
nates also on the whole head, where it forms broad shaft- 
streaks, as well as on fore-neck and chest. The centre of 
throat is already showing the white half-concealed spot of 
the adult female, the abdomen and under tail-coverts are 
white, but strongly suffused with dark brown. In both, 
male ') and female, the white pattern on the tail-feathers is 
indicated, though they hardly exceed a centimetre in length. 
The adult stage in male and female seems to be attained 
by a slow change of color rather than by a moult, beginning 
at the base and slowly proceeding towards the tip of the 
feather. 
The plumage of the adult is first acquired on back, 
upper wing-coverts and breast, and the last remnants of 
the rufous’ spots are found, as is shown by some specimens 
before me, at the base of the bill and on the superciliary 
region, 
This species belongs to the larger forms of the genus, 
and especially the bill is rather clumsy. Like its nearest 
ally, S. conereta from Tenasserim, it is only found in 
mountain-forests. 
Hab. Borneo: Mount Penrisen (Everett), Mount Dulit 
(Hose), Mounts Kenepai and Liang Koeboeng. 
102. Siphia unicolor. 
Cyorni sunicolor Blyth, J. A. 8. B, XII, pp. 941 and 1007 (1848); Oates, 
Faun. Br, Ind. Birds Il, p. 22. 
1) The young bird noted as a male might after all be a female,’on account 
of the white pattern on the tail-feathers, which is entirely absent in the 
adult male. 
Notes from the Leyden Museum, Vol. XXI. 
