BIRDS OF BOULDER COUNTY, COLORADO 207 



"coming down to 8,000 feet or less in winter" (Henderson). The eggs of this 

 species, which is restricted to Colorado, have never been taken (Sclater). 



Acanthis linaria linaria, Redpoll (528) 



Winter resident; erratic in its occurrence but at least occasionally common. 

 Fall dates are October 21 and November 5; last spring dates, March 12 and 14. 

 It has been found in the Plains and Yellow Pine zones. Gale reported it in 1888 

 and it was numerous about Boulder in the winter of 1910-1911. 



Acanthis linaria rostrata, Greater Redpoll (5286) 



Sprague took one near Magnolia, December 9, 1895, not quite typical but 

 assigned by Ridgway to this subspecies (Cooke). It is the only record for Colo- 

 rado. 



Astragalinus tristis tristis, Goldfinch (529) 



Permanent resident ; common in summer on the Plains and found at least in 

 migration in the Yellow Pine zone; infrequent in winter on the Plains (there 

 appear to be no February records) . Gale found young able to fly on July 4 and a 

 freshly built nest July 31; a nest with four eggs was found by the writer, August 

 27, on the Plains. Gale noted a flock on March 13 between 8,000 and 9,000 feet. 



Astragalinus psaltria psaltria, Arkansas Goldfinch (530) 



Summer resident; common on the Plains and occurring also in the Yellow 

 Pine. Arrives, May 21 — June 10 (3 records); leaves, September 21 — October 24 

 (3 records) . Gale does not mention this species in his notes. Widmann observed 

 a few at 9,000 feet near Estes Park in July, 1910. 



Spinus pinus, Pine Siskin (533) 



Permanent resident ; common in summer on the Plains and in the Yellow Pine 

 and Mountain zones. Infrequent in winter on the Plains. Gale found young in 

 the lower part of the Mountain zone on June 30 and also a nest with eggs, July 5 . 



Plectrophenax nivalis nivalis, Snow Bunting (534) 



Recorded from Boulder by Cooke. Not many records for the state, though 

 probably of regular occurrence in the northern part. 



Passer domesticus, European House Sparrow (Introduced) 



Henderson first noticed it in Boulder in 1898 and found it at Jamestown (in 

 the Yellow Pine zone) in 1904. It is now common in the towns of the county, in 

 the mountains as well as on the Plains. 



Calcarius omatus, Chestnut- collared Longspur (538) 



Migrant ; apparently very erratic in its appearance close to the foothills. It 

 has been recorded from the county by Cooke, and was common in the fall of 191 2 

 near Boulder in the last half of September. 



