444. Birds of Colorado 
feet, where it breeds ; it has also been met with on the plains, but 
probably only on migration. It arrives from the south early in May— 
El Paso co. May 2nd (Aiken), Monon, Baca co., May 3rd (Warren)— 
and leaves again late in September. At Grand Junction on the western 
slope Miss Eggleston states that it is a regular migrant (Rockwell), 
The following are recorded localities: Estes Park, breeding (W. G. 
Smith apud Chapman), Boulder co. (Minot), Middle and South Parks 
(Carter), Beulah, Pueblo co. (Chapman), Fort Garland and Pagosa 
Springs (Henshaw), all in the foothills and mountains ; Limon (Aiken) 
and Monon (Warren), in the plains. 
Habits.—Aiken was the first to find this Warbler 
in Colorado, and to him belongs the credit of first 
describing the nesting habits of the species. He gives 
the following account (Henshaw 75): “ During its 
migrations, this interesting little bird will be found among 
the cotton-woods and willows bordering the streams, 
and often also among the pines, but in summer it frequents 
only the low scrub-oak brush on the hill-sides. It 
exhibits at all times a good deal of shyness, hiding 
instantly at the approach of an intruder or keeping at 
a respectful distance while uttering its sharp alarm-note. 
The male is very musical during the nesting season, 
uttering his sweet little ditty continually as he skips 
through the bushes in search of his morning repast. 
No bird with which I am acquainted conceals its nest 
more effectually than this Warbler. This is placed at 
the base of a tussock of grass, among the oak bushes, 
being sunk in a hollow scratched in the earth so that 
the rim of the nest is on a level with the surface. About 
the first of June, five white eggs, delicately speckled 
with reddish-brown, are laid.” 
H. G. Smith found a nest on June 20th in Estes 
Park ; it was under a rock ledge, sunk in the ground 
and well hidden ; the eggs, four in number, were white, 
speckled chiefly in a wreath round the larger end, with 
reddish and purplish-brown, and measured ‘66 x °49. 
