222 UNIVERSITY OF COLORADO STUDIES 



southward movements. 1 Valuable notes on vertical migration a few- 

 miles south of this county were made by Mr. T. M. Tripp. 2 



It is sought herein to list all species hitherto reported from Boulder 

 County. The species which remain the year round are designated 

 "resident," those which simply pass through in their spring and fall 

 migrations are termed "migrants," though in many cases it is possible 

 that a few may remain through winter or summer unnoticed. The 

 terms "summer residents" and "winter residents" are self-explanatory, 

 both summer residents and residents of course nesting here. 



In the preparation of this list of 216 species (exclusive of those 

 bracketed to indicate doubt as to their occurrence, though quite a 

 number of those records are probably correct) the writer has consulted, 

 in addition to his own notes and the publications mentioned in the bibli- 

 ography herewith, manuscript notes and verbal communications furnished 

 by the following persons: Denis Gale, James Cowie, C. W. Rowland, 

 H. G. Smith, Wm. A. Sprague, L. C. Bragg, J. R. Brackett, A. H. 

 Felger, Harvey Markman, F. M. Dille, Walter Blanchard, Robt. B. 

 Rockwell, Alex Mackenzie. The collections in the University museum, 

 especially the Gale nests and eggs, and some specimens in the cabinets 

 of the State Historical and Natural History Society in the State Capitol, 

 at Denver, have also furnished valuable information. Probably 30 

 or more other species occur here which have not been noted. The 

 species are named and numbered according to the check-list of the 

 American Ornithologists' Union and supplements thereto down to the 

 time of completion of the manuscript in December, 1908. 



Bibliography 

 Anthony, A. W., "Winter plumage of Leucosticte australis." The Auk, Vol. IV, p. 257, 



1887. [Describes male, female and young from Gold Hill.] 

 , "A new subspecies of the genus Dryobates." The Auk, Vol. XIII, p. 32, 1896. 



[Describes D. v. montanus from Boulder, changing name to monticola in Vol. XV, 



p. 54, of same magazine.] 

 Bendire, C. E., "Notes on the habits, nests and eggs of the genus Sphyrapicus Baird." 



The Auk, Vol. V, pp. 225-240, 1888. [Contains Boulder County notes by Gale.] 

 ( "A peculiar nest of Cinclus mexicanus," The Auk, Vol. VI, p. 75, 1889. [De- 

 scribes a roofless nest collected by Gale on North Boulder Creek.] 



■ University of Colorado Studies, Vol. II, pp. in, 112, 1904. 



' Coces, E., Birds oj the Northwest. 



