2 20 UNIVERSITY OF COLORADO STUDIES 



Family PARI DAE, The Titmice 

 Penthestes atricapillus septentrionalis, Long-tailed Chickadee (735a) 



Permanent resident; in summer common in the deciduous growth along the 

 streams of the Yellow Pine zone; in winter common in similar situations on the 

 Plains. It reaches the Plains, September 10-25 (3 records); has been seen there 

 as late as April 14. There are no records for eggs from the county though Gale 

 found a completed nest, May 12. Just north of the county, Widmann observed 

 young out of the nest, July 15, at 6,000 feet, and also noted birds at 8,000 feet. 



Penthestes gambeli gambeli, Mountain Chickadee (738) 



Permanent resident ; abundant in the Yellow Pine and Mountain zones. In 

 winter it is occasionally seen with the Long-tailed Chickadees on the Plains but 

 some apparently remain in their summer range throughout the year. Gale 

 took many sets of eggs between May 25 and June 15, mostly between 8,ooo and 

 10,000 feet. 



Family SYLVIIDAE, The Kinglets, Gnatcatchers, etc. 

 Regulus satrapa olivaceus, Western Golden-crowned Kinglet (748a) 



Winter resident; rather rare in the Yellow Pine zone. Six records made by 

 the writer are in October, November, January and February. A specimen was 

 taken August 21, 1888, by Gale (Henderson), and several birds were seen August 

 28-30 by the writer at 10,500 feet. W. W. Robbins collected one near Tolland, 

 June 15, 1909, at 10,000 feet. It is probable that the bird will be found a rare 

 summer resident in the spruce regions. (The subspecific form of the Golden- 

 crowned Kinglet occurring in the county has not been determined. Sclater's 

 list has been followed, though the A.O.U. Check-List includes Colorado in the 

 range of the eastern form satrapa.) 



Regulus calendula calendula, Ruby-crowned Kinglet (749) 



Summer resident; common in the Mountain zone. Seen in the spring, 

 April 28, at 9,300 feet; reaches the Plains in the fall, September 24-25 (2 records), 

 and leaves, October 6-23 (4 records). Gale took a number of nests between June 1 

 and July 5. He noted an empty nest at 11,000 feet. 



Polioplila cocrulea obscura, Western Gnatcatcher (7510) 



Henderson saw one at Boulder on May 12, 1905, under favorable circumstance s 

 for identification. It is not common in the eastern part of the state and this is 

 the most northerly record given by Sclater. 



Family TURDIDAE, The Solitaires, Thrushes, Bluebirds 

 Myadestes townsendi, Townsend's Solitaire (754) 



Permanent resident; in summer common in the upper part of the Yellow Pine 

 and in the Mountain zone, at least occasionally reaching timberline (Mt. Audubon, 



