260 BULLETIN 2 03, UNITED STATES NATIONAL MUSEUM 



and auduboni. And more recently, Fred M. Packard writes to me: 

 "I have inspected skins in most of the major museums in America 

 to detect these hybrids, and have been surprised at the number I have 

 found. All but two were taken in the Rockies or farther west, so 

 that presumably the subspecies concerned is D. c. hooi^eriP 



DENDROICA AUDUBONI AUDUBONI (Townsend) 



PACIFIC AUDUBON'S WARBLER 



Plate 34 



HABITS 



The Pacific Audubon's warbler is a handsome western species 

 closely related to our familiar myrtle warbler, which to a large extent 

 it replaces, and is much like it in behavior and appearance; but it 

 has one more touch of color in its brilliant yellow throat, five spots 

 of yellow instead of four, and it has more white in the wings and 

 tail. Although its breeding range does not extend nearly as far 

 north as that of the myrtle warbler, it extends farther south, and to 

 considerably higher altitudes, breeding largely in the Canadian Zone 

 among the pines, firs, and spruces. Including the range of the Rocky 

 Mountain form {memorabilis) , which has not yet been admitted to 

 the A. O. U. Check-List, the type race breeds from central British 

 Columbia, central Alberta, and west-central Saskatchewan southward 

 to southern California, northern Arizona, New Mexico, and western 

 Texas. Throughout most of this range it is widely distributed in 

 the lowlands only during the winter, retiring to the mountains for 

 the breeding season. 



In the mountains of New Mexico it has been found breeding at 

 altitudes of form 7,500 feet to over 11,000 feet. In Colorado it 

 breeds at similar elevations and perhaps up to nearly 12,000 feet. In 

 southern California, Dr. Joseph Grinnell (1908) found it breeding in 

 the San Bernardino Mountains from 9,000 feet "almost to timber 

 limit, 10,500 feet elevation, at least. * * * This was one of the 

 most abundant birds of the San Bernardino mountains, and was 

 widely distributed from the lower edge of the Transition zone up 

 through the Boreal." Grinnell and Storer (1924) write: 



The Audubon Warbler is the most widely distributed and the most abundant 

 of all the species of wood warblers found in the Yosemite region. It occurs in 

 numbers throughout the main forested districts of the mountains during the 

 summer season, and it frequents the deciduous trees and brush of the foothill 

 and valley country in the winter time. 



Altitudinally its summer range extends from the beginning of the Transition 

 Zone yellow innes on the west slope, at 3300 to 3500 feet, up through the lodge- 

 pole pines and other conifers of the Canadian and Hudsonian zones to the upper 

 limit of unstunted trees at 10,000 feet or a little higher. * * * 



