318 
INSECTIVOROUS BIRDS. 
VIGOR’S VIREO. 
(Vireo Vigorsii. Audubon, pi. 30. male. Orn. Biog. i. p. 153.) 
Sp. Charact. — Dusky olive, throat greyish, breast ochre yellow; 
belly nearly white ; wings and tail blackish, the former with 2 
white bands ; some of the lateral tail-feathers white on their in- 
ner webs. 
An individual of this very rare bird was shot by its 
discoverer many years ago on an island in Perkiomen 
creek, in Pennsylvania, and has never since been seen 
by any naturalist. 
Some part of the throat and breast pale lemon yellow. Rump 
greenish. Wings edged with dusky brown ; 2d primary longest. 
Bill dusky. Feet and legs yellowish flesh color. Iris dark brown. 
Tail a little forked. 
Note. In the text, vol. i. p. 153, this bird is described as a Sylvia* 
THE THRUSHES. (Turdus. Lin.) 
In these birds the bile is of moderate dimensions with cutting 
edges, and compressed and curved towards the point; the upper man- 
dible is generally notched towards the extremity, the lower round- 
ish ; there are also a few scattered bristles near the opening of the 
bill. Nostrils basal, lateral, rounded, and half closed by a naked 
membrane. Tongue fringed and notched at tip. — Feet rather stout, 
the tarsus longer than the middle toe, which is attached at base to 
the outer one. Wings short or moderate; the first primary short, or of 
moderate length ; 3d, 4th, or 5th primaries longest. Scapulars hardly 
longer than the secondaries. — The female and young differ little 
from the male. The young, however, are more spotted. The moult 
is annual. 
They generally live in pairs only during the period of reproduc- 
tion ; both sexes sometimes assist in incubation, and the male is 
often observed to feed his mate while thus engaged. They migrate 
in large companies, or remain sedentary in the warmer parts of 
Europe, and the milder states of the American union. They live on 
