92 Scott on Birds observed at Twin Lakes, Colorado. 
in number, of a dirty white color, faintly spotted all over with light brown, 
which becomes quite definite at the larger end. They are large in propor- 
tion to the size of the bird, and one end is very little sharper than the 
other. The following are the dimensions : .55 x .45, .55 x .44, .54 x .42, .57 x 
.45, .58 x ,43. 
7. Parus montanus. Mountain Chickadee. — Not common. On 
the 15th of June I took a female that had evidently incubated. July 9 I 
found a nest containing four young, about ready to fly. The nest was very 
like that of our common species (P. atricapillus), and was in a dead cot- 
tonwood stub, about two feet from the ground. There was a mat of linino- 
material some three inches in thickness at the bottom of the cavity. The 
young birds show distinctly the white bands conspicuous in this species. 
8. Sitta carolinensis var. aculeata. White-bellied Nuthatch. 
— Not common. Met with but once. On July 111 took a family of this 
species, two adult and five young birds fully fledged. They had appar- 
ently just left the nest. 
9. Sitta pygmaea. Pygmy Nuthatch. — Common in localities. Saw 
old birds carrying food to their young June 29. 
10. Eremophila alpestris. Shore Lark. — Not common. 
11. Anthus ludovicianus. Titlark. — Undoubtedly breeding, as I 
met with a flock of ten on Weston’s Pass, at an elevation of about 13,000 
feet, July 19. 
12. Dendrceca auduboni. Audubon’s Warbler. — Not very com- 
mon. Two females, taken the 15th of June, showed signs of incubating, 
and the plumage was much worn. On the 25tli of June I took a nest con- 
taining four eggs nearly ready to hatch. The nest is a rather bulky struc- 
ture, composed of twigs of sage-brush and fine grass, and is lined with soft 
hair and large feathers. In general shape it is flat and rather shallow, as 
the following dimensions show : Diameter outside, four inches ; diameter 
inside, three inches ; depth, two and a half inches outside and two inches 
inside. It was situated on the outer twigs of a large pine-tree, five feet 
from the ground. It contains four eggs, of a light greenish tint, with a 
circle of dark brown spots at the larger end. They are quite sharply 
pointed, and of the following dimensions : .76 x .55, .72 x .58. I give the 
dimensions of only two, as the others were too badly broken to yield accu- 
rate measurements. The nest was not fastened in any crotch, but simply 
laid on a bunch of pine leaves, and was sheltered by another bunch di- 
rectly above it. On the 29th of June I found a second nest containing 
four young a day or two old. This one was situated in the topmost 
branches of a small fir-tree, about twenty-five feet from the ground. The 
nest is essentially the same in structure as the one above described. On 
July 9 I took young which had just left the nest. 
13. Pyranga ludoviciana. Louisiana Tanager. — Not uncommon 
in localities. On the 25th of June I found many in the scattered pines on 
the high hills to the north of the Lakes, and at an altitude of at least 
