on Dr. Jerdon's 'Birds of India.' 351 



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 arc 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 race 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. S. 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. subrujicollis 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. subruficullis, 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 count ryf- 



* The Burmese Hornbills are as follows : — 



1. Dichoceros bicornis. luclo-Chinese coimtries, Malayan Peniusiila, 

 and Sumatra. In Bm-ma much more numerous, and far less shy than in 

 India. 



2. Hijdrocissa albirostris. Bengal, Nipal, Asam, Indo-Chinese countries 

 (Sumatra, Java, and Borneo, teste Schlegel. Qu. H. convexa ?). 



3. Anorrhinus tickelli, nobis (Ibis, 18G4, p. 173 ; J. A. S. B. xxiv. p. 266, 

 xx^-iii. p. 412). Tenasserim provinces. 



4. Rliyticeros plicatus. 



5. R. suhnificollis. 



6. Aceros nijMlensis. S. E. Himalaya, Munipur, Tenasserim pro\ances. 

 t In India it should be borne in mind that the name Hindiistdn refers 



