92 Scott on Birds observed at Twin Lakes, Colorado. 



in number, of a dirty -wliite 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, .58X.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. atrlcapillux), and was in a dead Cot- 

 tonwood stub, about two feet from the ground. There was a mat of lining 

 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 pygmeea. Pygmy Nuthatch. — Common in localities. Saw 

 old birds carrying food to their young June 29. 



10. Eremophila alpestris. Shore Lark. — Not common. 



11. Authus 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 1 9. 



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 25th 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. The}' 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 25tli 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 



