1918. ] H. C. Rosinson & C. B. Ktoss: Birds. 207 
the peak, and were very hard to obtain. Unfortunately, in 
the absence of careful inspection and until we secured the 
only fully adult bird obtained, we thought that we were only 
dealing with young birds of Cichloselys sibirica, though we 
were surprised to find that species, reputed migratory, breeding 
on the mountain. We did not meet with it higher on the peak. 
Nearly all birds of this species obtained seem to be young, 
this having been the case with Doherty and Everett in the 
lesser Sunda Islands, as well as ourselves. The young birds 
have the feathers of the head and mantle with buff shaft 
stripes and the greater wing coverts tipped with orange buff. 
On the under surface all the feathers are regularly edged with 
black and are washed subterminally with pale buff. In the 
adult the breast is uniform clear grey, the middle of the belly 
almost pure white and the diamond shaped scale-like edgings 
to the flank feathers very clear and distinct. Comparison of 
the only adult with two recently obtained in Western Java 
discloses no material differences though the Sumatran bird 
has a slightly larger bill. 
The generic separation of this section with elongated, 
compressed and strongly hooked bill seems well justified. 
The species is an addition to the fauna of Sumatra, 
though it has been recorded from the off-lying island of 
Engano by Salvadori. 
135. Cichloselys sibirica subsp. davisoni (Hume). 
Turdus stbiricus, Pall., Reis. Russ. Reich. 11, p. 694 (1776); 
Wardl. Rams., P. Z. S. 1880, p. 16; Vorderman, Nat. Tijd. 
Nederl. Ind. xlix, p. 409, no. 360 (1889). 
Geocichla sibivica, Seebohm, Cat. Birds Brit. Mus. v, 
p. 180 (1881); Buttikofer, Notes Leyden Mus. ix, p. 70 (1887). 
Oreocincla inframarginata, Blyth, Journ. Asiat. Soc. Bengal. 
XX1xX, D. 106 (1860). 
Geocichla davisom (Hume), Stray Feath. v, pp. 63, 136 
(1877) ; Seebohm, Bull. Brit. Orn. Club, iv, p. xix, (1895) ; 
Sharpe in Seebh. Monogr. Turdidae, p. 1o1, pl. xxi (1898); 
Ogilvie Grant, Fascic. Malay. Zool. 11, p. 78 (1905). 
Cichloselys sibiricus, Robinson, Journ. Fed. Malay States 
Mus. ii, p. 206 (1909). 
Cichloselys mutabilis, Temm.; Vorderman, op. cit. p. 409, 
no. 361 (1889). 
a. 16. Siolak Daras, Korinchi Valley, Sumatra, 
3,000 feet. 28th March, 1914. [No. 494.] 
b-g. 34,1 6 imm., 2 ¢. Korinchi Peak, Sumatra, 
7,300 feet. 24th-28th April, 1914. | Nos. 
III2-3, 1118-9, 1158, 1233. | 
h-t. 16,12. Korinchi Peak, Sumatra, g-10,000 feet. 
29th April, 1914. [Nos. 1277-8.] 
Part Me Vertebrata, 
