164 VISCOUNT WALDEN ON THE BIRDS 
PyYRRHOCENTOR, Cabanis. 
65. * PYRRHOCENTOR MELANOPS. 
Centropus melanops, Lesson, Traité d’Orn. p. 137, “ Java!” errore (1831) ; Pucheran, R. et M. Z. 
1852, p. 473; Cassin, Un. St. Exp. Exped. p. 249, pl. 22. fig. 1 (1858); Walden, Tr. Zool. 
Soe. viii. p. 56. 
Centropus nigrifrons, Peale, Un. St. Expl. Exped. Ist ed. p. 137, “ Mindanao” (1848); Hartlaub, 
Wiegmann’s Archiv, 18ter Jahrgang, i. p. 107, no. 72 (1852). 
Pyrrhocentor unirufus, Cab. Mus. Hein. iv. p. 118, “ Philippines ” (1862). 
Hab. Mindanao (Peale). 
I have followed Cassin in the above identification of C. melanops with C. nigrifrons, 
ond I have little doubt, for reasons already stated (Walden, /.c.), that P. wnirufus is 
the same species in immature plumage. 
BUCEROTID. 
Bucrros, Linnzus. 
66. * BucEROS HYDROCORAX. 
Hydrocorax, Brisson, Orn. iv. p. 566, no. 1, pl. 45, “ Moluccis insulis,” av. juv. 
Buceros hydrocorax, Linn. 8. N. i. p. 153, no. 2 (1766), ex Brisson ; Temm. Pl. Col. 283, “ Philip- 
pines,” ¢ adult. 
Calao des Moluques, D’Aubent. Pl. Enl. 283, av. juv.; Buffon, Hist. Nat. Ois. vii. pp. 140, 147. 
Le Calao & casque plat, Le Vaillant, Ois. d’Afr. v. p. 127, pl. 240, rostrum. 
Le Calao roux, Le Vaillant, Ois. Rares, i. p. 18, pl. 6, av. juv. 
Buceros planicornis, Merrem.’ fide Bp. Consp. i. p. 89. 
Buceros platyrhynchus, Pearson’, J. A. 8. B. 1841, p. 652. 
Buceros obscurus, Peale, Un. St. Expl. Exped. Ist ed., Birds, p. 125, “ Philippines” (1848), 2 juw., 
nec Gm.; Hartlaub, Archiv fiir Naturgesch. 18ter Jahrgang, i. p. 105. 
Hab. Luzon. Iris in both sexes yellow (Meyer). 
It is with some difficulty that we can bring ourselves to recognize the large red-billed 
Philippine Hornbill in Brisson’s description and plate. 
The dimensions given by that author fall far short of those possessed by the adult; and 
a plumage is described which I have not observed, and which is not possessed by a much 
younger individual, judging by the casque obtained by Dr. Meyer. The figure by 
D’Aubenton (/. ¢.) bears a striking resemblance to that in the ‘ Ornithologia,’ and would 
almost seem to have been copied from Brisson’s plate. The description, too, given by 
* The reference to this title, as given by Giebel (Thesaurus, p. 499), is to me unintelligible. 
* A title published, without description, in his Catalogue of the Birds of the Asiatic Society of Bengal at 
Calcutta. Mr. Blyth (op. cit. 1843, pp. 988, 989) gave a full description of the specimen—although he erro- 
neously identified it with B. cristatus, Vieill. Later, in his Catalogue of the Calcutta Museum, p. 43, no. 176, 
he correctly identified the species. 
