194 BIRDS OF THE 



the white pattern on the tail-feathers and the absence of the 

 isabellina superciliary stripe. Wing 8 era., tail 5,3 — 5,5; 

 tarsus 2, culmen 1,8. 



Two fledged young birds (cf and 9)> killed April 

 2'^ and 5^^, probably just after having left their nest, are 

 dark brown, back and wing- coverts with a large rusty 

 brown subterrainal 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 iu 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. concreta from Tenasserim, it is only found in 

 mountain-forests. 



Hab. Borneo: Mount Penrisen (Everett), Mount Dulit 

 (Hose), Mounts Kenepai and Liang Koeboeug. 



102. Siphia unicolor. 



Cyorni sunicolor Blyth, J. A. S. B. XII, pp. 941 and 1007 (1843); Oates, 

 Faun. Br. Ind. Birds II, 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 IMuseum, "Vol. XXI. 



