ICA. Allen and Brewster on Colorado Birds. [July 



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. mexicmia. 



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 

 Caiion. 



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 atricapillus 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 triiie larger than atrica- 

 fiillus 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 atricapillus. 



15. Parus niontanus. 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 Monvnnent 

 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. 



