Ig18. | H. C. Ropinson & C. B. Kioss: Birds. 99 
the same outline as Celebes has at the present. It is at any- 
rate certain that the granitic mass of Kinabalu must have been 
separated from the other Indo-Malayan land-masses at a 
period subsequent to the evolution of many existing genera but 
yet at a period much more remote than the separation of Java 
from Sumatra by the Sunda Straits or the Malay Peninsula 
from Sumatra. 
1. Arboricola rubrirostris (Salvad.). 
Peloperdix rvubrivostris, Salvad. Ann. Mus. Civ. Gen. xiv, 
p- 251 (1879); Snelleman in Midden-Sumatra Exped. Vogels 
Iv, p. 46, pl. ui (1887) ; Buttikofer, Notes Leyden Mus. ix, p. 78 
(1887); Vorderman Nat. Tijd. Nederl. Ind. xlix, p. 414, 
no. 435 (1889). 
Arboricola rubrirvostris, Grant, Ibis, 1892, p. 396; id. Cat. 
Birds Brit. Mus. xxi, p. 215 (1893); id. Ibis, 1905, p. 167. 
a-c. 246,1?. Siolak Daras, Korinchi Valley, Suma- 
tra, 3,000 feet. 18-25th March, 1914. [Nos. 
215, 360, 424.| 
d—ft. 11 6, 11%, 7d imm. Sungei Kumbang, Korin- 
chi, Sumatra, 4,700 feet. 2nd April-15th 
May, 1914. [Nos. 557-8, 663-4, 689-691, 
756, 844-5, 878, 894, 921, 922, 957-8, 1019-22, 
1033, 1036-7, 1084-7, 1089, 1581.]} 
git. 7 6,2 2,16 imm. Korinchi Peak, Sumatra, 
7,300 feet. 24th April-13th May, 1914. 
[PNossst1t7, TIZ1, 11 77-Ouesre. 374, 1410, 
1431-2, I514.] 
“Male, irides hazel, orbital skin crimson lake, bill coral 
red, feet vermilion ; females and young birds have the colours 
duller, the feet more orange.” 
Extremely abundant in the flat jungle land in the neigh- 
bourhood of Sungei Kumbang and apparently fairly common 
around Siolak Daras, where several snared birds were brought 
to us by the natives. Found in pairs, or small.coveys, run- 
ning with great speed when disturbed and only taking to flight 
with reluctance. The note is a clear single whistle like that of 
Rollulus roulroul, but louder. 
The large series before us, nearly all of birds in fresh 
plumage and nearly all fully adult, shows that the differences 
in the sexes of this species are but slight. Laid ouit by sexes it 
can be seen that on the average the throat of the females is 
very much blacker than that of the males, while the feathers 
of the breast below the pectoral band are greyer than the 
males. The banding on the upper surface is on the whole less 
marked in the male than in the female and the dimensions of 
the latter, especially those of the tarsus and bill, are decidedly 
smaller. 
Part IL: Vertebrata, 
