ADDITIONAL LIST OF BOULDER COUNTY BIRDS, 

 WITH COMMENTS THEREON 



By Junius Henderson 



Since the publication of the preliminary list in Vol. I, No. 3, of 

 University of Colorado Studies, April, 1903, the following species 

 have come to our attention, making a total of 206 species now recorded 

 for the County: 



Podilymbus podiceps. — Pied-billed grebe. 



Ay thy a marila. — American scaup duck (Felger). 



Ay thy a afjinis. — Lesser scaup duck (Felger, Henderson). 



Clangula americana. — American goldeneye (Felger). 



Oidemia deglandi. — White- winged scoter (Felger). 



Olor columbianus. — Whistling swan. 



Porzana Carolina. — Carolina or sora rail (Felger, Henderson). 



Steganopus tricolor. — Wilson phalarope (Henderson). 



Helodromas solitarius. — Solitary sandpiper (Felger). 



Accipiter atricapillus. — American goshawk (Sprague). 



Buteo swainsonii. — Swainson hawk (Henderson). 



Dryobates pubescens homorus. — Batchelder woodpecker (Henderson). 



Picoides americanus dorsalis. — Alpine three-toed woodpecker (Felger). 



Sphyrapicus thyroideus. — Williamson sapsucker (Sprague, Felger). 



Tyr annus verticalis. — Arkansas kingbird (Dille). 



Empidonax difficilis. — Western flycatcher (Sprague, Brackett). 



Empidonax wrightii. — Wright flycatcher (Henderson). 



Aphelocoma woodhousei. — Woodhouse jay (Bragg, Henderson). 



Cyanocephalus cyanocephalus. — Pihon jay (Dille). 



Dolichonyx oryzivorus. — Bobolink (rare, Brackett, Bragg, Hender- 

 son). 



Agelaius phoeniceus. — Red- winged blackbird. 



Carpodacus cassini. — Cassin purple finch (Sprague, Henderson, 

 Bragg). 



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