473 



than in the adult bird, except some portions of the back and breast, 

 which seem to have been recently molted, and to have thus assumed 

 the ordinary adult coloration. A specimen resembling the above in the 

 markings of the tail is figured in Temminck's 'Planches Coloriees' (pi. 

 342). It seems probable that Ibycter fasciatus Spix is merely the imma- 

 ture bird of I. ater in the plumage above described. In a very adult 

 bird from Quito, in the IsTorwich Museum, the pure white caudal band 

 is varied by two isolated black spots, which I have no doubt are the 

 remains of the black transverse bars which cross this portion of the tail 

 in the young bird. A similar stage of plumage, but with more numerous 

 black spots, is figured in the 'Planches Coloriees' (pi. 37), (p. 95)." 



APPENDIX. 



The Ibycter gymnocephalus of d'Orbigny was based upon specimens 

 seen but not obtained by its describer at Cochabamba, Bolivia. It is 

 probably identical with J. '•'•formosus'''' Pelz. ex Lath. (=J. americanus),m. 

 which case the following is to be added to the synonomy of I. americanus. 



Ibycter gymnoceplialus d'Orb. Voy. Am. M6ricl. 1835, 50 ; Syaop. Av. Mag. Zool. 1838, 2. — 

 Strickl. Orn. Syii. i, 1855, 24.— Gkay, Gen. App. 1842, 1 ; Hand List, i, 1869. 

 5.— Sharpe, Cat. Ace. B. M. 1874, 34 (foot-note). 



