511 
Ibises of the Genus Theristicus. 
Theristicus caudatus has been confused with T. melanopis 
by Wagler, Schlegel, Elliot, and also by Sclater and Salvin; 
but it has been duly recognized as distinct by Berlepsch and 
Stolzmann, who have succeeded in establishing its specific 
characters and geographical distribution very clearly. Dr. 
Sharpe also has recognized T. caudatus as a distinct species, 
but, having missed Berlepsch and Stolzmann's excellent 
notes, he has failed in tracing the geographical distribution, 
and consequently the synonymy given by him is not exact. 
I should say that the specimen from Rio Pilcomayo (Cat. 
B. xxvi. p. 265), where, according to Mr. Graham Kerr, the 
bird is resident, must belong to T. caudatus and not to 
T. melanopis *. 
2. Theristicus melanopis. 
Blach-faced Ibis Lath. Gen. Syn. iii. pt. 1, p. 108, pi. lxxix. 
(New Year’s Island, near Staten Island) (1785) (cf. Forster, 
Voy. ii. p. 521); id. Gen. Hist. ix. pi. 150. 
Tantalus melanopis Gm. S. N. i. 2, p. 653, n. 19 (Insula 
Novi Anni) (1788) ; Lath. Ind. Orn. ii. p. 704, no. 5 (1790). 
Ibis melanopis Vieill. N. D. xvi. p. 20 (1817) (ex Latham); 
Dumont, Diet. Sc. Nat. xxii. p. 427 (1821) ; Vieill. Enc. 
Meth. iii. p. 1148, pi. 65. f. 2 (1823); Steph. in Shaw, Gen. 
Zool. xii. 1, p. 12 (1824) ; Drapiez, Diet. Class. H. N. viii. 
p. 490 (1825); Wagl. Syst. Av., gen. Ibis, sp. 17 (part.) 
(1827) ; Gerbe, Diet. Univ. H. N. vii. p. 7 (part., descr. nee 
habitat) (1843) ; Des Murs in Gay, Hist, de Chile, i. p. 417 
(1848); Hartl. Naumannia, 1853, pp. 216, 222 (Valdivia); 
Cass, in U. S. Astron. Exped. ii. p. 197 (Chile) (1856) ; 
Burrn. La Plata-Reise, ii. p. 511 (sub I. albicollis) (1861) ; 
Sohleg. Mus. P.-B., Ibis , p. 7 (part. nos. 1 and 2, Chile) 
(1863); Scl. P. Z. S. 1867, p. 339 (Chile) ; Scl. P. Z. S. 
1870, p. 665 (Santiago, Zool. Gard.); Philippi & Sandb. Cat. 
Av. Chil. p. 34 (1868) ; Huds. & Scl. P. Z. S. 1872, p. 549 
(Patagonia); Brehm, J. f. O. 1874, p. 95 (in confinement); 
Gieb. Thes. Orn. ii. p. 386 (part.) (1875); Rchnw. J. f. O. 
* P.S.—Dr. Sharpe now informs me that, as I surmised, the Pilcomayo 
specimen is T. caudatus . 
