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BIRDS OF COLORADO. 
751. Polioptila caerulea. Blue-gray Gnatcatcher. 
Summer resident; rare. Not known north of El Paso 
County nor west of the mountains. Breeds on the plains and 
in the foothills to 7,000 feet. H. W. Nash found a nest at 
Pueblo June 22, containing two young and a cowbird’s egg. 
Lowe notes its arrival at the same place April 27, common 
May 10. 
754. Myadestes townsendii. Townsend’s Solitaire. 
Resident; common. In the mountains is a permanent 
resident, winter as well as summer. Only visits the plains dur- 
ing the fall, winter and spring and then not so common as in 
the mountains and quite local. Leaves the plains about the 
hrst of May and returns about the middle of October, but strag- 
glers are found at the base of the foothills, both later and earlier 
than these dates. Though not common except at the western 
edge of the plains, Capt. P. M. Thorne took four specimens at 
Fort Lyon and it is known as a rare fall and winter visitor in 
western Kansas. Through all the winter it can be found in 
the mountains from the lower valleys to about 10,000 feet; in 
summer it breeds from 8,000 to fully 12,000 feet. Pairs the 
last of April and first of May and laying lasts from the first week 
in June to the middle of July. Though so abundant and well 
known, it was not until 1876 that the first nest with eggs was 
taken. This was by W. L. Lamb in Summit County July, 1876, 
at 10,000 feet; eggs about ten days incubated. T. M. Trippe 
found a nest and four eggs at Howardsville July 9, 1880, D. D. 
Stone found two sets June 20 and one June 25, 1882, at Hancock, 
and Win. G. Smith took fresh eggs on Buffalo Creek, Jefferson 
County, June 18, 1883. During the season of 1883 D. D. Stone 
took ten sets from June 6 to July 8 at Alpine Tunnel and Han- 
cock. After this they could no longer be called “extremely 
rare. ’ ’ 
756a. Turdus fuscesccns salicicola. Willow Thrush. 
vSummer resident; not uncommon. Occurs throughout 
the lower parts of the State, during migration as far east as 
Kansas. Breeds in the foothills and parks to about 8,000 feet. 
Arrives early in May. 
758a. Turdus ustulatus swainsonii. Olive-backed Thrush. 
Summer resident, rare; in migration, common. The bulk 
pass through Colorado on the plains and in the mountains from 
the first week in May to the last of the month, and on the 
return arrive in September and leave the State in October. A 
few remain to breed from the plains to 10,500 feet, but most 
above 8,000 feet. 
