VISCOUNT "WALDEN ON THE BIRDS OF CELEBES. 47 



But it seems possible that the absence and presence of the white frontal spots only denote 

 phases of plumage. If not, the Indian bird will belong to a different species, while the 

 Celebean may be either the same as the Indian (in itself highly improbable), or repre- 

 sent a third form. 



CAPEIMULGID^. 



Lyncoknis, Gould. 



56. Lyncornis macropterus, Bp. Consp. i. p. 62, "Celebes" (1850); Wallace, Ibis, 



1860, p. 141. 

 Hob. Menado {Wallace). 



BUCEROTID^. 



BucEEOS, Linnaeus. 



57. BucEROS EXAEATUS, " Eeinw.," Temm. Nouv. Recueil, livr. xxxvi. pi. 211,?, 



"Celebes" (2nd August, 1823); Schlegel, Mus. Pays-Bas, Buceros, p. 10. 

 (P1.V. fig.l,.?; fig. 2,?.) 



Hob. Tondano (Forsten); Menado (mus. nosfr.); appears to be restricted to the 

 north-eastern parts of Celebes. 



The male is distinguished from the female by having the throat, cheeks, ear-coverts, 

 sides of neck, and superciliary stripes springing from base of mandible white. In my 

 examples the white supercilium has light ferruginous-brown feathers intermixed. In 

 dimensions the female appears to be somewhat smaller. The example I note from is 

 marked by the collector "female," while the entirely black individuals are marked 

 " males." According to Professor Schlegel (l. c.) the subject of Temminck's plate was a 

 female ; and, together with Salomon Miiller, he describes the male as having the throat 

 and sides of the head white. 



As this curious form does not belong to any of the established subdivisions of the 

 family, I leave it for the present in the old Linnsean genus. It is certainly not a 

 Eydrodssa, as classed by Prince Bonaparte. It belongs to the group of Hombills, in 

 which the casque and the true maxilla are completely blended together, the pro- 

 longation of the casque forming, in old birds, the apex of the maxilla. 



Ceajntorrhinus, Cabanis. 



58. Cranorrhinus cassidix (Temm.), PI. Col. 210, 6, "Celebes" (2nd August, 1823). 

 Buceros cassidix, Temm. ; ScUegel & Miiller^ Verhandel. Zool. Aves, p. 34, pi. 4 bis, $ ; Schlegel, 



Mus. Pays-Bas, Buceros, p. 9; Wallace, Malay Archip. i. p. 364. 



Hob. Tondano (jReinwardt) ; Menado (mus. nostr.) ; district of Maros, Macassar 

 (Wallace). 



The types of the two plates above cited came from Tondano. In the old males the 



