122 BIRDS OF COLORADO. 



ern Colorado. The only one who has formally noted both forms 

 is V. h. Kellogg, who reports finding both in Estes Park during 

 the summer. (Trans. Kans. Acad. Science, XII. 1889-90, 86.) 

 A specimen taken at Fort Collins is a fair intermediate between 

 the two forms. Not enough material has been collected to de- 

 fine its range in Colorado. 



727a. Sitta carolinensis aculeata. Slender-bii-led Nut- 

 hatch. 



Resident; common. This is the common form in Colo- 

 rado occurring throughout the State from the foothills westward. 

 Winters at the edge of the plains and in the foothills, less com- 

 monly nearly to the pines. Breeds occasionally down to the 

 plains, but commonly from about 7,500 feet to timber-line. Its 

 upward -movement occurs in April and it breeds the last of May 

 and early in June. Returns to the lower regions in October. 



728. Sitta canadensis. Red-breasted Nuthatch. 



Resident; not uncommon. Migratory on the plains and 

 resident in the mountains to about 8,000 feet, occasionally to 

 10,000 feet. Less common than the Slender-billed or the Pygmy 

 Nuthatches. Breeds in June. 



730. Sitta pygmaea. Pygmy Nuthatch. 



Resident; abundant. Comes east only to the edge of the 

 plains and occurs there only in the winter. Descends from the 

 mountains in December and remains through until February. 

 By the first of March all have returned to the mountains. At 

 the same time they are fully as abundant in the mountains, 

 braving the severest cold to at least 8,000 feet. During the 

 summer they are most common from 7,000 to 10,000 feet and a 

 few breed as low as 6,000 feet. The great bulk scarcely make 

 any migration, even vertical. Begins to pair in April and laying 

 begins the latter part of May. Probably two broods are often 

 reared. 



733a. Parus inornatus griseus. Gray Titmouse. 



Resident; not common. Known only from southern Colo- 

 rado, coming north to El Paso County and east to the eastern 

 foothills. It has been taken from 5,000 to 9,000 feet and is 

 known to breed, but its breeding range is not yet definitely de- 

 termined. It seems probable that it winters in the foothills 

 and breeds from 5,000 to 8,000 feet. 



735a. Parus atricapillus septentrionalis. Long-tailed 



CniCKADEEi 



Resident; not uncommon. Winters on the plains and 

 in the foothills, occasionally up to 8,000 feet. Breeds in the 



