226 
Minot on Colorado Birds. 
this song is not often to be heard. June 8, I found a nest and five fresh 
eggs, as described in the Bulletin of July, 1880, but with hasty measure- 
ments a little in excess. The following is a more careful description. 
The nest was in the roof of a cave, about ten feet from the ground, in a 
niche, or pocket, with an opening so narrow, vertically, that I could neither 
look in nor introduce my hand. Fortunately, however, the rock was so 
soft that I easily removed the bottom slab on which the nest rested. This, 
as one looks down upon it, suggests the Eastern Wood Pe wee’s. It is 
composed of twigs, stalks, and bits of leaves, surrounded by a few loose 
sticks, and thickly felted with down, silk, and a few feathers. The hol- 
low is 2^ inches long, and scarcely half as deep. The eggs measure about 
.70 X .50 of an inch, and are crystal white (rosy when fresh), sparsely 
speckled and spotted, chiefly about the crown, with medium dull brown. 
10. Anthus ludovicianus, Licht. Titlark. — A summer resident 
above timber line, and occasionally below : at least one pair was estab- 
lished about the highest of the Seven Lakes. May 28, a flock of more 
than fifty appeared on Boulder Plains, in advance of a heavy storm, but 
apparently were all gone the next day. The only song-notes I heard were 
weak and tremulous, — nothing better than monotonous trills. On com- 
paring these birds with Bay-winged Sparrows all about, I found them less 
nimble in running. 
11 . Mniotilta varia, Vieill. Black-and-white Creeper. Boulder, 
June 1 . „ 
12. Helminthophaga virginiae, Baird. Virginia’s Warbler. — At 
Boulder, common through the latter part of May in creek shrubbery, and 
not shy; at Manitou, in summer, the most abundant of its tribe, fre- 
quenting (like the Chestnut-sided Warbler about Boston) the oak-scrub, 
where it is not easily caught sight of : occasional on the mountains. 
Ordinary note, a sharp chip ; song, simple but various (deceptively so) : 
common forms are die' -we-clie' -we-che' -we-che' -we, wil-a-wit! -wit! -wit! (these 
terminal notes being partially characteristic of Helmintliophagce ) and che- 
we' -c.he-we' -che-we ' , die' -a-che' -a-che' . 
13. Helminthophaga celata, Baird. Orange-crowned Warbler. 
— I observed this species as a migrant only. At Boulder, it was not un- 
common in the latter part of May. Its habits are generic, and its notes 
and song much like the Nashville Warbler’s. 
14. Helminthophaga peregrina, Cab. Tennessee Warbler. — 
Boulder, May 3 1 . With a characteristic slender tsip, but no song that I 
certainly detected ; active, about twenty feet up, frequently hanging from 
clusters. Also recorded by Mr. Aiken, further south. 
15. Dendrceca aestiva, Baird. Yellow Warbler. — Abundant 
summer residents, gathering, however, about civilization. Mr. Hensliaw 
speaks of their eggs in the West having a white ground : such specimens 
I have several times found near Boston, where, however, their song varies 
somewhat from that of the Colorado form. Writers have compared this 
