107 
Paraguay, Bolivia, and Southern Brazil. 
m-q. S ? ad. et imm. Los Ynglases, Ajo. May 1909. 
r. ? ad. Los Ynglases, Ajo. Feb. 3, 1910. 
A very common and resident species in the Ajo district. 
During the winter months it assembles in large flocks and 
does no inconsiderable damage to the maize crops. These 
flocks present an exceedingly pretty picture with their red 
heads contrasting with the black wings and body. 
The nest is placed, as a rule, in the canadons and is a deep 
cup-shaped structure of dry swamp-grass built between the 
stems of strong plants. Three eggs appear to be the full 
clutch. 
The call is a sort of whistle. 
64. PSEUDOLEISTES VIRESCENS. 
Pseudoleistes virescens Scl. Cat. B. xi. p. 352; Arg. Orn. 
i. p. 102. 
a. ? ad. Los Ynglases, Ajo. Oct. 30,1908. 
b. $ ad. „ „ Nov. 24, 1908. 
Iris hazel; bill, legs, and toes black. 
c. £ ad. ; d, e. $ ? juv. Los Ynglases, Ajo. Jan. 2, 
1909. 
/, g. S ? juv. Los Ynglases, Ajo. Jan. 7, 1910. 
One of the commonest of the resident species in the Ajo 
district, being the “Pecho amarillo” of the Spaniards; it is 
usually found in flocks throughout the year, especially 
during the winter months. It is an inquisitive and noisy 
bird, especially when going to roost. 
The nest is placed either in the herbage in the canadons 
or in low bushes or shrubs in the woods, and sometimes in 
the Tala trees; it is a large cup-shaped structure. Five or 
six eggs seem to be the full clutch, though this number is 
not often found, owing to the Cow-birds Molothrus bonari - 
ensis and M. rufoaxillaris being parasitic on this species, 
especially the latter. In some nests I have found only the 
eggs of the Cow-bird, those of the Yellow-breast having 
been all destroyed. 
