BIRDS OF COLORADO. 1 23 



mountains from 7,000 to 10,000, rarely above 9,000 feet and 

 rather uncommon breeding on the plains. 



738. Parus gambeli. Mountain Chickadee. 



Resident; abundant. The most common Titmouse in 

 Colorado. Occasionally comes down to the plains in the fall and 

 winters as far east as Pueblo. Resident in the mountains nearly 

 to timber-line. Leaves the lowlands in April and nests from 

 8,000 feet to timber-line, ranging in the fall to the tops of the 

 loftiest peaks. Breeds early in June. 



744. Psaltriparus plumbeus. IvEad-colored Bush-Tit. 



Resident; not common. Western Colorado, coming east 

 to the eastern foothills, wintering up to 6,500 and breeding from 

 the plains to 7,800. The only records are those of C. E. Aiken 

 and W. P. Lowe. 



748. Regulus satrapa. Golden-crowned Kinglet. 

 Summer resident; rare, breeding; rather common, in mi- 

 gration. Arrives late in April and is present on the plains but 

 a few days; returning, leaves the last of September. Less com- 

 mon than the Ruby-crown and the few that remain to breed in 

 Colorado, range higher than the bulk of the Ruby-crowns. In 

 migration occurs through the State; breeds only near timber- 

 line at about 11,000 feet. Breeds early in July. 



749. Regulus calendula. Ruby-crowned Kinglet. 

 Summer resident; abundant, both in migration and 



breeding. Although very common during the breeding season 

 near the timber-line, but few nests have ever been taken. The 

 first one known to science was taken by J. H. Batty, near 

 BufiFalo Mountains June 21, 1873, and contained five young and 

 one egg. During the same year, Henshaw found a nearly fin- 

 ished nest at Fort Garland June 11. W. E. D. Scott took the 

 next nest with five eggs at Twin Lakes June 25, 1879, followed 

 two years later by one with four young, taken by F. M. Drew 

 in San Juan County July 5, 1881. D. D. Stone took a set of 

 eggs in 1883, at Hancock, and saw young August i, while 

 J. A. Allen saw young on Mount Lincoln the last of July. 



Arrives on the plains early in April, passes through the 

 middle mountains during May, and reaches its breeding grounds 

 the last of May and early in June. Only known as a migrant 

 on the plains and in the foothills, the last leaving in the spring 

 migration early in May, Returns to the plains early in October 

 and leaves the State the last of that month. Breeds most com- 

 monly from 9,000 feet to timber-line, less commonly 2,000 feet 

 lower. It is rather queer that it should seem to breed at a lower 

 altitude in southern Colorado than in northern. Begins to 

 descend early in September. 



