ii8 
BIRDS OF COLORADO. 
Geo. F. Breninger at Fort Collins May 22, and now in the inu- 
senin of the Agricultnral College is almost typical pileolata^ 
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 
nncommon as a breeder in the mountains below 8,000 feet. 
Trippe saw a female in July at timber-line, but this is 3,000 feet 
above its normal range. 
6q7. 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. Laying begins 
early in July, 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 writerosaw several pairs on the Cache La Poudre the 
last of July, that, if they nested higher, must have descended 
very early. Laying 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. 
