x 54 
Allen and Brewster on Colorado Birds. 
[J«iy 
During stormy weather in April and the early part of May, 
particularly when snow covered the foothills or the edge of the 
plains, they gathered into flocks of fifty to one hundred and fifty 
or more, of which one-fourth to one-third were S. tnexicana. 
We may add that we heard no attempt at song from either S. 
mexicana or S. arctica , in this respect they differing strikingly 
from the Eastern Bluebird. 
11. Cinclus mexicanus. Dipper; Water Ousel. — The 
only one seen was shot April 7, at the mouth of South Cheyenne 
Canon. 
12. Regulus calendula. Ruby-crowned Kinglet. — Not 
uncommon during most of April wherever there was timber. 
Observed as late as May 5. 
13. Regulus satrapa. Golden-crested Kinglet. — Sev- 
eral times met with in April, and one was shot May 4. Less 
common than the preceding. 
14. Parus atricapilius septentrionalis. Long-tailed 
Chickadee. — Infrequently observed in the wooded creek bottoms 
and at Austin’s Bluffs. 
Our Colorado specimens of this race are but a trifle larger than atrica- 
pillus proper, but their tails are relatively longer, and the white of the 
wings and tail purer and more extended. The most typical examples of 
septentrionalis which I have are from Dakota, where the variety appears 
to attain its maximum size and whiteness. The difference between Dakota 
and Colorado specimens is considerable, in fact nearly as great as between 
the latter and true atricapilius. 
15. Parus montanus. Mountain Chickadee. — A few 
pairs were seen during March and April ; none later. 
16. Sitta carolinensis aculeata. Slender-billed Nut- 
hatch. — Two were shot in April— the only ones seen during 
our many excursions. A pair observed on West Monument 
Creek in June were evidently breeding. 
17. Certhia familiaris montana. Brown Creeper.— 
Several were seen and one was shot April 7* A few were seen 
on following days, but none later than April. 
The single specimen taken is typical of the above variety lately insti- 
tuted by Mr. Ridgway. 
18. Salpinctes obsoletus. Rock Wren. — A single spec- 
imen was shot April 17, but no others were seen for ten days, 
when they suddenly became abundant, and for a week were to 
be seen in rocky places everywhere. They were less numerous 
later, but continued common at suitable localities. 
