AUDUBON'S WABBLEB. 129 



Tl^e most complete history of this species is to be found in Dr. 

 Coues's Birds of the Colorado Valley. Most of the spring immi- 

 grants from Mexico keep on to high latitudes before pausing to 

 breed ; but a few secure the requisite conditions of temperature, 

 et cetera, by ascending lofty mountains in regions far south of 

 those to which their more eager brethren have flown. In Col- 

 orado it nestles from 9,000 feet up to timber-line, and is abundant 

 among the pines and aspens, building its home the first week in 

 June. One nest which Henshaw found near Denver was composed 

 of bark strips firmly and neatly woven, with a lining of fine grasses ; 

 it was four inches in diameter and an inch deep. In Arizona he 

 took young just firom the nest on July 12, even so far south as 

 Mount Graham, where the young birds were just beginning their 

 new plumage on the ist of August. At Lake Tahoe, in the Sierra 

 Nevada, newly fledged birds were seen by Dr. Cooper in September. 

 A nest found by Ridgway in the Wahsatch mountains of Utah, 

 June 23, 1869, was near the extremity of the horizontal branch of 

 a pine tree, about ten feet from the ground. It contained one egg 

 and three young. 



Both Dr. Brewer and Dr. Coues draw their description of the 

 nest of Audubon's warbler from a single specimen in the National 

 Museum, transmitted from Vancouver by the late Mr. J. Hepburn, 

 who affirms that the structure may be placed indifferently in the 

 upper branches of trees or in bushes only a few feet from the ground. 

 This nest was built in the crotch formed by three forks of an 

 oblique stem, its shape consequently being obliquely conical. The 

 exterior is composed of rather coarse strips of fibrous bark and 

 weeds variously intertwined, the main substance consisting of fine 

 grasses, mosses, and rootlets, mixed with some large feathers and 

 bits of string, these miscellaneous materials being closely matted 

 or felted ; and the interior is finished off with an abundant lining 

 of horse-hairs. The cavity is small, but deep. 



Mr. W. E. D. Scott, on the contrary, brings home a nest obtained 

 at Twin lakes. Col., which he says was not in a crotch at all. His 

 description is as follows : 



On the 25 th of June I took a nest containing four eggs nearly ready to 

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