10. THEBISTICUS. 



23 



slight greenish shade, but -with scarcely any indication of dusky 

 margins to the feathers. 



The differences of plumage relied on by Count von Berlepsch and 

 Mr. Stolzmann for the separation of T. hmniclii seem to me to be 

 only those of age or season. The feathered throat occurs in some 

 of the Chilian birds, and, like the white abdomen, seems to be a 

 sign of immaturity. On the other hand, T. caudatus would seem 

 to lose the feathering of the throat, as our female specimen has the 

 middle of the throat bare. 



Bah. South America, from the Straits of Magellan to Chili and 

 Peru, Argentina and Uruguay ; north to the province of Matto 

 Grosso in Brazil. 



a. Ad. sk. [S.America.]* Old Coll. 



b. Ad. sk. ChiU. C. Crawlev, Esq. 



[P.]. 



c. d. S ? ad. sk. Sandy Point, Straits of Magel- Voy. H.M.S. ' Chal- 



laii. lenger.' 



e,/. Ad. St. Straits of Magellan. Antarctic Exped. 



y. 2 i^^- sk. Pitumarca, Peru, April 8 (if. Salvin-Godman Coll. 



Wkiteli/). 



h. Skeleton. Chili. Purchased. 



2. Theristicus caudatus. 



Cou: 

 Le 



rly a col blanc de Cayenne, Datthent. PI. Enl. viii. pi. 976. 

 Grand Courlis de Cayenne, Buff. Hist. Nat. Ois. viii. p. 47 



(1781). 

 Scolopax caudatus, Bodd. Tubl. PI. Bnl. p. 57 (1/83). 

 White-necked Ibis, Lath. Gen. Syn. iii. pt. 1, p. 109 (1785). 

 Tantalus albicollis, Gm. Syst. Nat. i. p. 653 (1788). 

 Geronticus caudatus, Gray, Gen. B. iii. p. 566 (1847) ; id. Hatid-l. 



B. iii. p. 40, no. 10234 (1871). 

 Ibis albicollis, Cab. m Schomb. Eeis. Gidan. iii. p. 757 (1848). 

 Theristicus albicollis, Bp. Cotisp. ii. p. 155 (1855). 

 Geronticus caudatus, Gra;/, Hand-l. B. iii. p. 40, no. 10234 (1871). 

 Theristicus melanopis (nee Gm.), Scl. Sf Salv. Nomencl. p. 127 



(1873: pt.). 

 Ibis caudata, Reichen. J. f. O. 1877, p. 154. 

 Theristicus caudatus, Mh'of, P. Z. S. 1877, p. 492 (pt.) ; Salvin, Ibis, 



1886, p. 171 (British Guiana). 



Adult female. Similar to T. melanosis, but darker ; blackish 

 above, distinctly glossed with oil-green, and not having the banded 

 appearance of the fore-named species, the black of the under 

 surface spreading over the whole of the chest, breast, and abdomen : 

 "iris red" {H. Whitdij). Total length 26 iuches, culmen 5-9, 

 wing 15, tail 7, tarsus 3'05. 



Hah. British Guiana. 



a. (S ad. sk. 



b. 5 ad. sk. 



c. Skeleton. 



Rupurumi River, British Guiana, 



Nov. 15 (H. Whitely). 

 Aunai, April 1 (JT. W.). 



Salvin-Godman CoU. 



Salvin-Godman Coll. 

 Purchased. 



* " Interior of Africa " ! Major Denham : cf. Gray, Cat. Grallse, p. 91. 



