175 
the Province of Buenos Ayres. 
whistling note, and feeds on aquatic plants. I found it com¬ 
mon at Baradero in April. 
31. Psetjdoleistes virescens (Vieill.); Scl. et Salv. P.Z. S. 
1868, p. 140. 
I have only observed this bird here in April; but it probably 
remains all the year a little to the north of the city. It goes 
in flocks, and frequents bushes on low damp land. Pretty 
common at Baradero in April. 
32. Leistes superciliaris, Bp.; Scl. et Salv. P. Z. S. 1868, 
p. 140. 
Resident and common both here and up the Parana. It 
frequents low marshy land, in the winter congregating in 
flocks of considerable size. It has a curious habit of rising 
almost perpendicularly in the air to chase some passing in¬ 
sect, and dropping again as suddenly to the thistle or tuft of 
grass on which it had been perching. The young in their 
first plumage differ entirely from adult birds. The former 
are light and dark brown above, instead of dull black as in 
the adult, and lack all signs of the brilliant scarlet of the 
throat and breast; they show, however, a faint trace of pink 
on the elbows, and have the white transocular line as in the 
adult. A few seen at Baradero in April. 
33. Sturnella defilippxi, Bp.; Scl. et Salv. P. Z. S. 1869, 
p. 161. 
Very common and generally distributed. In the winter 
they congregate in enormous flocks. 
34. Myiotheretes rufiventris (Vieill.) ; Scl. et Salv. 
P.Z.S. 1868, p. 141. 
A winter visitor, but rare. On the 25th of March I saw a 
single bird at Moreno, and on the 25th of May I shot a spe¬ 
cimen at Punta Lara. In the air its long, pointed, almost 
Plover-like wing, and on the ground its bold upright position, 
are sufficient to establish its identity. Its habits seem gene¬ 
rally like those of the other Tceniopterce ; and it is always in 
a restless state, flitting from a clod of earth to the top of a 
thistle, or making a sudden dart at some passing insect. The 
