Il8 BIRDS OF COLORADO. 



Geo. F. Breninger at Fort Collins May 22, and now in the mu- 

 seum of the Agricultural College is almost typical pileolaia, 

 much nearer that than pusilla. This is the only record for 

 Colorado about which there is no doubt. Several other records 

 probably refer to pusilla. 



687. Setophaga ruticilla. American Redstart. 



Summer resident; not uncommon in eastern Colorado; 

 rather rare in western Colorado. In migration on the plains 

 and in the foothills it is fairly common. Arrives about the 

 middle of May. A few breed on the plains and it is not 

 uncommon as a breeder in the mountains below 8,000 feet. 

 Trippe saw a female in July at timber-line, but this is ^,000 feet 

 above its normal range. 



697. Anthus pensilvanicus. American Pipit. 



Summer resident ; common. In migration occurs through- 

 out the State ; breeds only on the summits of the mountains. 

 Arrives on the plains the last of April and it is about a month 

 later that the last have departed into the mountains. Through 

 May it is in the higher mountain parks and by June has 

 ascended above timber-line to its summer home. L,aying begins 

 early in Jul)', as soon as the first grass has started. Most nests 

 are made between 12,000 and 13,000 feet, the lowest known 

 being one on Mount Audubon at 11,000 feet, found with fresh 

 eggs July 3. Never goes below timber-line during the breeding 

 season. In August many wander to the tops of the peaks at 

 14,000 feet. At this time they gather into flocks and remain 

 high until late in the season. They descend into the upper 

 parks the last of September and some remain above timber-line 

 until October. During October they come back to the plains 

 and leave the State in November. 



701. Cinclus mexicanus. American Dipper. 



Resident ; common in suitable localities. Remains near 

 open water all the year. In winter this brings it down to the 

 foothills and larger mountain streams, usually between 6,000 

 and 9,000 feet, but it has been noted clear down to the plains. 

 Common all winter in the Canon of the Grand River as far 

 down as Glenwood Springs at about 5,500 feet. Moves back 

 into the mountains as soon as the streams thaw out in April and 

 spends the summer from 8,000 feet to just below timber-line. 

 No record of any nest being found lower than 8,000 feet, but the 

 present writer saw several pairs on the Cache La Poudre the 

 last of July, that, if they nested higher, must have descended 

 very early. lyaying begins the last of May and early in June. 

 Remains high in the mountains as late as possible, until it is 

 forced by the coldest weather to descend to the lower valleys. 



