44 BIRDS OF LA PLATA 
The second species of the three known to me is 
the Blue Tanager, Tanagra sayaca, the entire plumage 
of which is a pale glaucous blue. A few of these 
birds migrate as far south as Buenos Ayres and are 
seen in small parties of four or five in the woods on 
the shores of the Plata. The male emits a series of 
squealing sounds by way of song. 
The third species is the Blue-and-Yellow Tanager, 
Tanagra bonariensis. The plumage is rich blue above 
and bright yellow beneath. The female is olive green 
above and buff colour beneath. This species also 
visits Buenos Ayres in small numbers in spring 
(October). Both sexes have a long reedy call-note, 
and the male has a song composed of a succession 
of sounds like the bleating of a kid. 
There are eleven more species of Tanager in 
Argentina, all confined to the northern part of the 
country. 
GLAUCOUS FINCH 
Guiraca glaucoczrulea 
Uniform glaucous blue ; wings and tail blackish, the feathers edged 
with light blue; length 5.7 inches. 
Tue Finches in Argentina number about fifty species 
and belong mostly to forms peculiar to the New 
World, the chief exception being the genus Chry- 
somitris (Siskins), which has perhaps the widest 
