CALAVERAS WARBLER 519 



On June 5, 1915, we were shown a nest of the Calaveras Warbler in 

 the vicinity of Smith Creek, east of Coulterville. It was in a hollow of 

 the ground at the base of an azalea bush, near an old road along the hill- 

 side. The creek itself was about 50 feet distant. This nest was 3 inches 

 across the outside and about 2 inches high, the cavity being I14 inches 

 deep. Strips of bark of the incense cedar, plant fibers, and horsehair 

 comprised the building material. "When first discovered it had contained 

 five eggs, but prior to our seeing it the nest had been raided and all trace 

 of the eggs was gone. A third nest was discovered near the bridge over 

 Yosemite Creek above Yosemite Falls on July 1, 1915. It was ensconced 

 in a shallow hole in the bank at the side of a well traveled trail, A tuft 

 of grass overhung and nearly concealed the structure. One of the adult 

 birds was flushed from the nest, which, however, contained neither eggs 

 nor young. 



Calaveras Warblers continue in the Yosemite region at least throughout 

 August ; individuals have been seen along the McClure Fork of the Merced 

 River on August 26 and 29, 1915. The latter is our latest date of noting 

 this species in the region, although Mr. Joseph Mailliard (1918, p. 17) 

 made definite record of an individual in Yosemite Valley as late as Sep- 

 tember 16 (1917). 



Orange-crowned Warblers. Vermivora celata (Say)^* 



Field characters. — Half size of Junco. Whole body dull greenish, tinged with yellow 

 beneath. No wing bars or other contrasted markings of any sort (pi. 9&). Voice: 

 Song of male a series of tinny notes, uttered rapidly and descending slightly in pitch 

 toward end of series; call note a moderate chit. 



Occurrence. — Summer visitant in small numbers locally in Upper Sonoran and 

 Transition zones on both slopes of Sierra Nevada. Also passes along both slopes of 

 mountains in migration. Winters in small numbers at Snelling.34 Keeps to inner foliage 

 of trees on shaded hillslopes, foraging 10 to 30 feet above ground but nesting on ground. 

 Solitary. 



34 Two subspecies of the Orange-crowned Warbler occur in the Yosemite section. 

 These are so much alike that they cannot be separately recognized in the field. 



LxJTESCENT Warbler, Vermivora celata hitescens (Ridgway), a brightly greenish- 

 tinged subspecies (pi. 9b), nests in summer in the Upper Sonoran and Transition zones 

 on west slope of Sierra Nevada, as near Coulterville, and ranges to higher levels after 

 nesting season, as up to 10,500 feet altitude on Mount Clark (August 22, 1915) and to 

 10,350 feet near Vogelsang Lake (August 31, 1915). 



EoCKY Mountain Orange-crowned Warbler, Vermivora celata orestera Oberholser, 

 a duller colored (less yellow tinged) subspecies, of slightly larger size, which summers in 

 the Rocky Mountains and Great Basin, occurs also at that season sparingly around Mono 

 Lake. 



Birds of this species, but of undetermined subspecies, were seen at Snelling in mid- 

 winter; these may have represented a third subspecies, namely, the Eastern Orange- 

 crowned Warbler. 



