1869.) BIRDS FROM THE ARGENTINE REPUBLIC. 635 
tainly the bird described by Azara and Bonaparte as above quoted. 
We are, however, inclined to doubt very much whether this is really 
the young of A. erythromelas, as referred by Bonaparte, Burmeister, 
and other authors; and prefer waiting for other examples before 
arriving at a definite conclusion upon this point. We are not at 
present able to distinguish the so-called 4. erythromelas (adult) 
from A. ewilis of North America, 
30. Ibis CHRULESCENS, Vieill. 
Ibis plumbea, Temm. Pl. Col. 235 ; Burm. J. ¢. p. 510. 
One skin of this species. 
31. DENDROCYGNA FULVA. 
Anas fulva, Gm. 8. N.i. p. 530; Wagl. Isis, 1831, p. 532. 
Dendrocygna fulva, Baird, B. N. A. p. 771, t. 63. 
Anas virgata, Max. Beitr. iv. p. 918; Burm. Syst. Ueb. iii. p. 435, 
et La Plata-Reise, ii. p. 514. 
Dendrocygna fulva et D. virgata, Sclater, P. Z. 8. 1864, p. 301, 
et 1866, p. 149. 
A good skin of this species, which we have compared with a 
Mexican specimen, and find to be undistinguishable. 
32. QUERQUEDULA BRASILIENSIS (Gm.). 
Anas brasiliensis, Gm. S. N.i. p. 517; Max. Beitr. iv. p. 936 ; 
Burm. La Plata-Reise, il. p. 517. 
Two skins. ‘Pato portuguese, found in pairs.” 
33. QUERQUEDULA TORQUATA. 
Pato collar negro, Azara, Apunt. ili. p. 452. 
Anas torquata, Vieill. N. D. v. p. 110, et E. M. p. 355 (3). 
Querquedula torquata, Gray, Gen. iii. p. 616, et List of Gall. 
(1843) p. 139; Hartl. Ind. Az. p. 28 (¢). 
Pato ceja blanca, Azara, 1. ec. p. 453 (2). 
Anas leucophrys, Vieill. N.D. v. p. 156, et E. M. p. 355; Hartl. 
Ind. Az. p. 28; Gray, Gen. ili. p. 616 (2). 
Two males and one female of this fine duck, of which we have only 
previously seen the pair in the British Museum. Azara’s Pato ceja 
blanca, which has puzzled Hartlaub and others, is certainly the 
female. This sex differs from the male in the absence of the dark 
chestnut on the scapularies, which are of a dull brown, in the brown 
head and nape, in the absence of the black collar, and in the pure 
white throat and irregular superciliary stripe. The breast is mottled 
with brown, instead of being of a salmon-colour with distinct round 
black spots. The flanks are white, with brown mottling, instead of 
being white minutely freckled with grey. 
34, Mareca CHILOENSIS (King). 
Anas chiloensis, Burm. La Plata-Reise, ii. p. 517. 
Two examples of this species. 
wS 
