351 
on Dr. Jerdon’s f Birds of India.’ 
from the Papuan R. ruficollis (Vieillot): the sole distinction of plu¬ 
mage, and that in the male sex only, being that in the Tenasserim 
race the dark colour of the cap contrasts strongly with the 
yellowish-white of the cheeks (as also in R. plicatus ), whilst in 
the Papuan race these colours are more or less blended. The 
cheeks and gular skin are, however, clear pale yellow in the 
male of the Tenasserim bird; whereas Mr. Wallace informs me 
that the males of the Papuan i-ace have the bare skin of the 
throat bluish-white, while in the females it is milk-white, with 
the margins merely tinged with bluish. Irides salmon-coloured 
in the Papuan race, crimson in the Tenasserim race. This 
latter, and the mode of growth of its casque, is noticed in the 
‘ Catalogue of the Birds of the India Museum/ ii. 600 (also 
P. Z. IS. 1839, p. 452). The very slight differences between 
the two would never be recognized as of specific import by Prof. 
Schlegel, while the identification of them as one species involves 
a remarkable anomaly in geographical distribution, since no 
corresponding form has been obtained from the intervening- 
countries. I have only seen R. subruficollis from the Tenasserim 
provinces, whereas R. plicatus ranges northward to the hills 
bordering on Sylhet, and southward into the Malayan Peninsula, 
Sumatra, and Java. In the India Museum is a drawing of a 
fresh specimen of R. subruficollis, taken under the superintend¬ 
ence of the late Dr. Wallich*. 
Prof. Schlegel gives certain species of Hornbill as inhabitants 
of “ Hindustan/’ which have never occurred to British observers 
in that countryf. 
* The Burmese Hornbills are as follows:— 
1. Dichoceros bicornis. Indo-Chinese countries, Malayan Peninsula, 
and Sumatra. In Burma much more numerous, and far less shy than in 
India. 
2. Hydrocissa albirostris. Bengal, Nipal, Asam, Indo-Chinese countries 
(Sumatra, Java, and Borneo, teste Schlegel. Qu. II. convex a ?). 
3. Anorrhinus tickelli, nobis (Ibis, 1864, p. 173 ; J. A. S. B. xxiv. p. 266, 
xxviii. p. 412). Tenasserim provinces. 
4. Hhyticeros plicatus. 
5. Ii. subruficollis. 
• 6. Aceros nipalensis. S. E. Himalaya, Munipur, Tenasserim provinces. 
t In India it should be borne in mind that the name Hindustan refers 
