330 ON THE BIRDS INHABITING [1875. 



Examples from the islands cited in no way differ. A very distinct species, somewhat smaller 

 than C.javancntiis, Dumont. Wings deep rufous as in C. chlororhrjnclius, Blyth ; remainder of the 

 plumage, tail included, black, shaded with bronze-green. Sexes alike {Jide Meyer). 



Tr. Z. 8. ix. Ptekhocentor, Cabanis. 



^' ' 65. * Ptrrhocextoe mela^vops. 



Centrojnis melanops. Lesson, Traite d'Orn. p. 137, " Java ! " errore (1831) ; Pucheran, R. et 

 M. Z. 1852, p. 473 ; Cassin, Un. St. Expl. Exped. p. 249, pi 22. fig. 1 (1858); Walden, Tr. Zool. 

 Soc. viii. p. 5C. \_Antea, p. 158.] 



Centropus nigrifrons, Peale, Un. St. Expl. Exped. 1st ed. p. 137, " Mindanao " (1848) ; 

 Hartlaub, Wiegmann's Archiv, ISter Jahrgang, i. p. 107, no. 72 (1852). 



Pyrrhocentor unirnfiis. Cab. Mus. Hein. iv. p. 118, " Philippines " (1862). 



Hob. Mindanao {Peale). 



I have followed Cassin in the above identification of C. melanopjs with C. nigrifrons, and I 

 have little doubt, for reasons already stated (Walden, I. c), that P. vnirttfus is the same species 

 in immature plumage. 



BUCEROTID^. 

 BucEROS, Linnaeus. 



66. * BuCEROS HTDROCOE.\X. 



Hydrocorax, Brisson, Orn. iv. p. 566, no. 1, pi. 45, " Moluccis insulis," av.juv. 



Pnceros hydrocorax, Linn. S. N. i. p. 153, no. 2 (1766), ex Brisson ; Temm. PL Col. 283, 

 " Philippines," d adult. 



Calao des Moluques, D'Aubent. PL Enl. 283, av.juv. ; Buffon, Hist. Nat. Ois. vii. pp. 140, 

 147. 



Le Calao a casque plat, Le Vaillant, Ois. d'Afr. v. p. 127, pi. 240, rostrum. 



Le Calao roux, Le Vaillant, Ois. Pares, i. p. 13, pi. 6, av.juv. 



Bt(ceros planicornis, Merrem f , _^^/e Bp. Consp. i. p. 89. 



Buceros pAatyrhynchus, Pearson J, J. A. S. B. 1841, p. 652. 



Buceros ohscurus, Peale, Un. St. Expl. Exped. 1st ed., Birds, p. 125, "Philippines" (1848), 

 ? juv., nee Gm. ; Hartlaub, Archiv fiir Naturgesch. 18ter Jahrgang, i. p. 105. 



Hah. Luzon. Iris in both sexes yellow {Meyer). 



It is with some difl[iculty that we can bring ourselves to recognize the large red-billed 

 Philippine HornbiU 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 



t The reference to this Htlc, as given by Giebel (Thesaurus, p. 499), is to me unintelligible. 



t A title published, -ndthout 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 erroneously identified it -with 

 B. cristatus, VieUl. Later, in his Catalogue of the Calcutta Museum, p. 43, no. 176, he correctly identified the species. 



